Zwiebeln schneiden (Test-Scene-Nick2)

Viagg-io/Assets/EzySlice.meta

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Viagg-io/Assets/EzySlice/Framework.meta

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Viagg-io/Assets/EzySlice/Framework/IntersectionResult.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+
+    /**
+     * A Basic Structure which contains intersection information
+     * for Plane->Triangle Intersection Tests
+     * TO-DO -> This structure can be optimized to hold less data
+     * via an optional indices array. Could lead for a faster
+     * intersection test aswell.
+     */
+    public sealed class IntersectionResult {
+
+        // general tag to check if this structure is valid
+        private bool is_success;
+
+        // our intersection points/triangles
+        private readonly Triangle[] upper_hull;
+        private readonly Triangle[] lower_hull;
+        private readonly Vector3[] intersection_pt;
+
+        // our counters. We use raw arrays for performance reasons
+        private int upper_hull_count;
+        private int lower_hull_count;
+        private int intersection_pt_count;
+
+        public IntersectionResult() {
+            this.is_success = false;
+
+            this.upper_hull = new Triangle[2];
+            this.lower_hull = new Triangle[2];
+            this.intersection_pt = new Vector3[2];
+
+            this.upper_hull_count = 0;
+            this.lower_hull_count = 0;
+            this.intersection_pt_count = 0;
+        }
+
+        public Triangle[] upperHull {
+            get { return upper_hull; }
+        }
+
+        public Triangle[] lowerHull {
+            get { return lower_hull; }
+        }
+
+        public Vector3[] intersectionPoints {
+            get { return intersection_pt; }
+        }
+
+        public int upperHullCount {
+            get { return upper_hull_count; }
+        }
+
+        public int lowerHullCount {
+            get { return lower_hull_count; }
+        }
+
+        public int intersectionPointCount {
+            get { return intersection_pt_count; }
+        }
+
+        public bool isValid {
+            get { return is_success; }
+        }
+
+        /**
+         * Used by the intersector, adds a new triangle to the
+         * upper hull section
+         */
+        public IntersectionResult AddUpperHull(Triangle tri) {
+            upper_hull[upper_hull_count++] = tri;
+
+            is_success = true;
+
+            return this;
+        }
+
+        /**
+         * Used by the intersector, adds a new triangle to the
+         * lower gull section
+         */
+        public IntersectionResult AddLowerHull(Triangle tri) {
+            lower_hull[lower_hull_count++] = tri;
+
+            is_success = true;
+
+            return this;
+        }
+
+        /**
+         * Used by the intersector, adds a new intersection point
+         * which is shared by both upper->lower hulls
+         */
+        public void AddIntersectionPoint(Vector3 pt) {
+            intersection_pt[intersection_pt_count++] = pt;
+        }
+
+        /**
+         * Clear the current state of this object 
+         */
+        public void Clear() {
+            is_success = false;
+            upper_hull_count = 0;
+            lower_hull_count = 0;
+            intersection_pt_count = 0;
+        }
+
+        /**
+         * Editor only DEBUG functionality. This should not be compiled in the final
+         * Version.
+         */
+        public void OnDebugDraw() {
+            OnDebugDraw(Color.white);
+        }
+
+        public void OnDebugDraw(Color drawColor) {
+#if UNITY_EDITOR
+
+            if (!isValid) {
+                return;
+            }
+
+            Color prevColor = Gizmos.color;
+
+            Gizmos.color = drawColor;
+
+            // draw the intersection points
+            for (int i = 0; i < intersectionPointCount; i++) {
+                Gizmos.DrawSphere(intersectionPoints[i], 0.1f);
+            }
+
+            // draw the upper hull in RED
+            for (int i = 0; i < upperHullCount; i++) {
+                upperHull[i].OnDebugDraw(Color.red);
+            }
+
+            // draw the lower hull in BLUE
+            for (int i = 0; i < lowerHullCount; i++) {
+                lowerHull[i].OnDebugDraw(Color.blue);
+            }
+
+            Gizmos.color = prevColor;
+
+#endif
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/IntersectionResult.cs.meta

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Viagg-io/Assets/EzySlice/Framework/Intersector.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+    /**
+     * Contains static functionality to perform geometric intersection tests.
+     */
+    public sealed class Intersector {
+
+        /**
+         * Perform an intersection between Plane and Line, storing intersection point
+         * in reference q. Function returns true if intersection has been found or
+         * false otherwise.
+         */
+        public static bool Intersect(Plane pl, Line ln, out Vector3 q) {
+            return Intersector.Intersect(pl, ln.positionA, ln.positionB, out q);
+        }
+
+        
+        public const float Epsilon = 0.0001f;
+        /**
+         * Perform an intersection between Plane and Line made up of points a and b. Intersection
+         * point will be stored in reference q. Function returns true if intersection has been
+         * found or false otherwise.
+         */
+        public static bool Intersect(Plane pl, Vector3 a, Vector3 b, out Vector3 q) {
+            Vector3 normal = pl.normal;
+            Vector3 ab = b - a;
+
+            float t = (pl.dist - Vector3.Dot(normal, a)) / Vector3.Dot(normal, ab);
+
+            // need to be careful and compensate for floating errors
+            if (t >= -Epsilon && t <= (1 + Epsilon)) {
+                q = a + t * ab;
+
+                return true;
+            }
+
+            q = Vector3.zero;
+
+            return false;
+        }
+
+        /**
+         * Support functionality 
+         */
+        public static float TriArea2D(float x1, float y1, float x2, float y2, float x3, float y3) {
+            return (x1 - x2) * (y2 - y3) - (x2 - x3) * (y1 - y2);
+        }
+
+        /**
+         * Perform an intersection between Plane and Triangle. This is a comprehensive function
+         * which alwo builds a HULL Hirearchy useful for decimation projects. This obviously
+         * comes at the cost of more complex code and runtime checks, but the returned results
+         * are much more flexible.
+         * Results will be filled into the IntersectionResult reference. Check result.isValid()
+         * for the final results.
+         */
+        public static void Intersect(Plane pl, Triangle tri, IntersectionResult result) {
+            // clear the previous results from the IntersectionResult
+            result.Clear();
+
+            // grab local variables for easier access
+            Vector3 a = tri.positionA;
+            Vector3 b = tri.positionB;
+            Vector3 c = tri.positionC;
+
+            // check to see which side of the plane the points all
+            // lay in. SideOf operation is a simple dot product and some comparison
+            // operations, so these are a very quick checks
+            SideOfPlane sa = pl.SideOf(a);
+            SideOfPlane sb = pl.SideOf(b);
+            SideOfPlane sc = pl.SideOf(c);
+
+            // we cannot intersect if the triangle points all fall on the same side
+            // of the plane. This is an easy early out test as no intersections are possible.
+            if (sa == sb && sb == sc) {
+                return;
+            }
+
+            // detect cases where two points lay straight on the plane, meaning
+            // that the plane is actually parralel with one of the edges of the triangle
+            else if ((sa == SideOfPlane.ON && sa == sb) ||
+                (sa == SideOfPlane.ON && sa == sc) ||
+                (sb == SideOfPlane.ON && sb == sc)) {
+                return;
+            }
+            
+            // detect cases where one point is on the plane and the other two are on the same side
+            else if ((sa == SideOfPlane.ON && sb != SideOfPlane.ON && sb == sc) ||
+                     (sb == SideOfPlane.ON && sa != SideOfPlane.ON && sa == sc) ||
+                     (sc == SideOfPlane.ON && sa != SideOfPlane.ON && sa == sb)) {
+                return;
+            }
+
+            // keep in mind that intersection points are shared by both
+            // the upper HULL and lower HULL hence they lie perfectly
+            // on the plane that cut them
+            Vector3 qa;
+            Vector3 qb;
+
+            // check the cases where the points of the triangle actually lie on the plane itself
+            // in these cases, there is only going to be 2 triangles, one for the upper HULL and
+            // the other on the lower HULL
+            // we just need to figure out which points to accept into the upper or lower hulls.
+            if (sa == SideOfPlane.ON) {
+                // if the point a is on the plane, test line b-c
+                if (Intersector.Intersect(pl, b, c, out qa)) {
+                    // line b-c intersected, construct out triangles and return approprietly
+                    result.AddIntersectionPoint(qa);
+                    result.AddIntersectionPoint(a);
+
+                    // our two generated triangles, we need to figure out which
+                    // triangle goes into the UPPER hull and which goes into the LOWER hull
+                    Triangle ta = new Triangle(a, b, qa);
+                    Triangle tb = new Triangle(a, qa, c);
+
+                    // generate UV coordinates if there is any
+                    if (tri.hasUV) {
+                        // the computed UV coordinate if the intersection point
+                        Vector2 pq = tri.GenerateUV(qa);
+                        Vector2 pa = tri.uvA;
+                        Vector2 pb = tri.uvB;
+                        Vector2 pc = tri.uvC;
+
+                        ta.SetUV(pa, pb, pq);
+                        tb.SetUV(pa, pq, pc);
+                    }
+
+                    // generate Normal coordinates if there is any
+                    if (tri.hasNormal) {
+                        // the computed Normal coordinate if the intersection point
+                        Vector3 pq = tri.GenerateNormal(qa);
+                        Vector3 pa = tri.normalA;
+                        Vector3 pb = tri.normalB;
+                        Vector3 pc = tri.normalC;
+
+                        ta.SetNormal(pa, pb, pq);
+                        tb.SetNormal(pa, pq, pc);
+                    }
+
+                    // generate Tangent coordinates if there is any
+                    if (tri.hasTangent) {
+                        // the computed Tangent coordinate if the intersection point
+                        Vector4 pq = tri.GenerateTangent(qa);
+                        Vector4 pa = tri.tangentA;
+                        Vector4 pb = tri.tangentB;
+                        Vector4 pc = tri.tangentC;
+
+                        ta.SetTangent(pa, pb, pq);
+                        tb.SetTangent(pa, pq, pc);
+                    }
+
+                    // b point lies on the upside of the plane
+                    if (sb == SideOfPlane.UP) {
+                        result.AddUpperHull(ta).AddLowerHull(tb);
+                    }
+
+                    // b point lies on the downside of the plane
+                    else if (sb == SideOfPlane.DOWN) {
+                        result.AddUpperHull(tb).AddLowerHull(ta);
+                    }
+                }
+            }
+
+            // test the case where the b point lies on the plane itself
+            else if (sb == SideOfPlane.ON) {
+                // if the point b is on the plane, test line a-c
+                if (Intersector.Intersect(pl, a, c, out qa)) {
+                    // line a-c intersected, construct out triangles and return approprietly
+                    result.AddIntersectionPoint(qa);
+                    result.AddIntersectionPoint(b);
+
+                    // our two generated triangles, we need to figure out which
+                    // triangle goes into the UPPER hull and which goes into the LOWER hull
+                    Triangle ta = new Triangle(a, b, qa);
+                    Triangle tb = new Triangle(qa, b, c);
+
+                    // generate UV coordinates if there is any
+                    if (tri.hasUV) {
+                        // the computed UV coordinate if the intersection point
+                        Vector2 pq = tri.GenerateUV(qa);
+                        Vector2 pa = tri.uvA;
+                        Vector2 pb = tri.uvB;
+                        Vector2 pc = tri.uvC;
+
+                        ta.SetUV(pa, pb, pq);
+                        tb.SetUV(pq, pb, pc);
+                    }
+
+                    // generate Normal coordinates if there is any
+                    if (tri.hasNormal) {
+                        // the computed Normal coordinate if the intersection point
+                        Vector3 pq = tri.GenerateNormal(qa);
+                        Vector3 pa = tri.normalA;
+                        Vector3 pb = tri.normalB;
+                        Vector3 pc = tri.normalC;
+
+                        ta.SetNormal(pa, pb, pq);
+                        tb.SetNormal(pq, pb, pc);
+                    }
+
+                    // generate Tangent coordinates if there is any
+                    if (tri.hasTangent) {
+                        // the computed Tangent coordinate if the intersection point
+                        Vector4 pq = tri.GenerateTangent(qa);
+                        Vector4 pa = tri.tangentA;
+                        Vector4 pb = tri.tangentB;
+                        Vector4 pc = tri.tangentC;
+
+                        ta.SetTangent(pa, pb, pq);
+                        tb.SetTangent(pq, pb, pc);
+                    }
+
+                    // a point lies on the upside of the plane
+                    if (sa == SideOfPlane.UP) {
+                        result.AddUpperHull(ta).AddLowerHull(tb);
+                    }
+
+                    // a point lies on the downside of the plane
+                    else if (sa == SideOfPlane.DOWN) {
+                        result.AddUpperHull(tb).AddLowerHull(ta);
+                    }
+                }
+            }
+
+            // test the case where the c point lies on the plane itself
+            else if (sc == SideOfPlane.ON) {
+                // if the point c is on the plane, test line a-b
+                if (Intersector.Intersect(pl, a, b, out qa)) {
+                    // line a-c intersected, construct out triangles and return approprietly
+                    result.AddIntersectionPoint(qa);
+                    result.AddIntersectionPoint(c);
+
+                    // our two generated triangles, we need to figure out which
+                    // triangle goes into the UPPER hull and which goes into the LOWER hull
+                    Triangle ta = new Triangle(a, qa, c);
+                    Triangle tb = new Triangle(qa, b, c);
+
+                    // generate UV coordinates if there is any
+                    if (tri.hasUV) {
+                        // the computed UV coordinate if the intersection point
+                        Vector2 pq = tri.GenerateUV(qa);
+                        Vector2 pa = tri.uvA;
+                        Vector2 pb = tri.uvB;
+                        Vector2 pc = tri.uvC;
+
+                        ta.SetUV(pa, pq, pc);
+                        tb.SetUV(pq, pb, pc);
+                    }
+
+                    // generate Normal coordinates if there is any
+                    if (tri.hasNormal) {
+                        // the computed Normal coordinate if the intersection point
+                        Vector3 pq = tri.GenerateNormal(qa);
+                        Vector3 pa = tri.normalA;
+                        Vector3 pb = tri.normalB;
+                        Vector3 pc = tri.normalC;
+
+                        ta.SetNormal(pa, pq, pc);
+                        tb.SetNormal(pq, pb, pc);
+                    }
+
+                    // generate Tangent coordinates if there is any
+                    if (tri.hasTangent) {
+                        // the computed Tangent coordinate if the intersection point
+                        Vector4 pq = tri.GenerateTangent(qa);
+                        Vector4 pa = tri.tangentA;
+                        Vector4 pb = tri.tangentB;
+                        Vector4 pc = tri.tangentC;
+
+                        ta.SetTangent(pa, pq, pc);
+                        tb.SetTangent(pq, pb, pc);
+                    }
+
+                    // a point lies on the upside of the plane
+                    if (sa == SideOfPlane.UP) {
+                        result.AddUpperHull(ta).AddLowerHull(tb);
+                    }
+
+                    // a point lies on the downside of the plane
+                    else if (sa == SideOfPlane.DOWN) {
+                        result.AddUpperHull(tb).AddLowerHull(ta);
+                    }
+                }
+            }
+
+            // at this point, all edge cases have been tested and failed, we need to perform
+            // full intersection tests against the lines. From this point onwards we will generate
+            // 3 triangles
+            else if (sa != sb && Intersector.Intersect(pl, a, b, out qa)) {
+                // intersection found against a - b
+                result.AddIntersectionPoint(qa);
+
+                // since intersection was found against a - b, we need to check which other
+                // lines to check (we only need to check one more line) for intersection.
+                // the line we check against will be the line against the point which lies on
+                // the other side of the plane.
+                if (sa == sc) {
+                    // we likely have an intersection against line b-c which will complete this loop
+                    if (Intersector.Intersect(pl, b, c, out qb)) {
+                        result.AddIntersectionPoint(qb);
+
+                        // our three generated triangles. Two of these triangles will end
+                        // up on either the UPPER or LOWER hulls.
+                        Triangle ta = new Triangle(qa, b, qb);
+                        Triangle tb = new Triangle(a, qa, qb);
+                        Triangle tc = new Triangle(a, qb, c);
+
+                        // generate UV coordinates if there is any
+                        if (tri.hasUV) {
+                            // the computed UV coordinate if the intersection point
+                            Vector2 pqa = tri.GenerateUV(qa);
+                            Vector2 pqb = tri.GenerateUV(qb);
+                            Vector2 pa = tri.uvA;
+                            Vector2 pb = tri.uvB;
+                            Vector2 pc = tri.uvC;
+
+                            ta.SetUV(pqa, pb, pqb);
+                            tb.SetUV(pa, pqa, pqb);
+                            tc.SetUV(pa, pqb, pc);
+                        }
+
+                        // generate Normal coordinates if there is any
+                        if (tri.hasNormal) {
+                            // the computed Normal coordinate if the intersection point
+                            Vector3 pqa = tri.GenerateNormal(qa);
+                            Vector3 pqb = tri.GenerateNormal(qb);
+                            Vector3 pa = tri.normalA;
+                            Vector3 pb = tri.normalB;
+                            Vector3 pc = tri.normalC;
+
+                            ta.SetNormal(pqa, pb, pqb);
+                            tb.SetNormal(pa, pqa, pqb);
+                            tc.SetNormal(pa, pqb, pc);
+                        }
+
+                        // generate Tangent coordinates if there is any
+                        if (tri.hasTangent) {
+                            // the computed Tangent coordinate if the intersection point
+                            Vector4 pqa = tri.GenerateTangent(qa);
+                            Vector4 pqb = tri.GenerateTangent(qb);
+                            Vector4 pa = tri.tangentA;
+                            Vector4 pb = tri.tangentB;
+                            Vector4 pc = tri.tangentC;
+
+                            ta.SetTangent(pqa, pb, pqb);
+                            tb.SetTangent(pa, pqa, pqb);
+                            tc.SetTangent(pa, pqb, pc);
+                        }
+
+                        if (sa == SideOfPlane.UP) {
+                            result.AddUpperHull(tb).AddUpperHull(tc).AddLowerHull(ta);
+                        } else {
+                            result.AddLowerHull(tb).AddLowerHull(tc).AddUpperHull(ta);
+                        }
+                    }
+                } else {
+                    // in this scenario, the point a is a "lone" point which lies in either upper
+                    // or lower HULL. We need to perform another intersection to find the last point
+                    if (Intersector.Intersect(pl, a, c, out qb)) {
+                        result.AddIntersectionPoint(qb);
+
+                        // our three generated triangles. Two of these triangles will end
+                        // up on either the UPPER or LOWER hulls.
+                        Triangle ta = new Triangle(a, qa, qb);
+                        Triangle tb = new Triangle(qa, b, c);
+                        Triangle tc = new Triangle(qb, qa, c);
+
+                        // generate UV coordinates if there is any
+                        if (tri.hasUV) {
+                            // the computed UV coordinate if the intersection point
+                            Vector2 pqa = tri.GenerateUV(qa);
+                            Vector2 pqb = tri.GenerateUV(qb);
+                            Vector2 pa = tri.uvA;
+                            Vector2 pb = tri.uvB;
+                            Vector2 pc = tri.uvC;
+
+                            ta.SetUV(pa, pqa, pqb);
+                            tb.SetUV(pqa, pb, pc);
+                            tc.SetUV(pqb, pqa, pc);
+                        }
+
+                        // generate Normal coordinates if there is any
+                        if (tri.hasNormal) {
+                            // the computed Normal coordinate if the intersection point
+                            Vector3 pqa = tri.GenerateNormal(qa);
+                            Vector3 pqb = tri.GenerateNormal(qb);
+                            Vector3 pa = tri.normalA;
+                            Vector3 pb = tri.normalB;
+                            Vector3 pc = tri.normalC;
+
+                            ta.SetNormal(pa, pqa, pqb);
+                            tb.SetNormal(pqa, pb, pc);
+                            tc.SetNormal(pqb, pqa, pc);
+                        }
+
+                        // generate Tangent coordinates if there is any
+                        if (tri.hasTangent) {
+                            // the computed Tangent coordinate if the intersection point
+                            Vector4 pqa = tri.GenerateTangent(qa);
+                            Vector4 pqb = tri.GenerateTangent(qb);
+                            Vector4 pa = tri.tangentA;
+                            Vector4 pb = tri.tangentB;
+                            Vector4 pc = tri.tangentC;
+
+                            ta.SetTangent(pa, pqa, pqb);
+                            tb.SetTangent(pqa, pb, pc);
+                            tc.SetTangent(pqb, pqa, pc);
+                        }
+
+                        if (sa == SideOfPlane.UP) {
+                            result.AddUpperHull(ta).AddLowerHull(tb).AddLowerHull(tc);
+                        } else {
+                            result.AddLowerHull(ta).AddUpperHull(tb).AddUpperHull(tc);
+                        }
+                    }
+                }
+            }
+
+            // if line a-b did not intersect (or the lie on the same side of the plane)
+            // this simplifies the problem a fair bit. This means we have an intersection 
+            // in line a-c and b-c, which we can use to build a new UPPER and LOWER hulls
+            // we are expecting both of these intersection tests to pass, otherwise something
+            // went wrong (float errors? missed a checked case?)
+            else if (Intersector.Intersect(pl, c, a, out qa) && Intersector.Intersect(pl, c, b, out qb)) {
+                // in here we know that line a-b actually lie on the same side of the plane, this will
+                // simplify the rest of the logic. We also have our intersection points
+                // the computed UV coordinate of the intersection point
+
+                result.AddIntersectionPoint(qa);
+                result.AddIntersectionPoint(qb);
+
+                // our three generated triangles. Two of these triangles will end
+                // up on either the UPPER or LOWER hulls.
+                Triangle ta = new Triangle(qa, qb, c);
+                Triangle tb = new Triangle(a, qb, qa);
+                Triangle tc = new Triangle(a, b, qb);
+
+                // generate UV coordinates if there is any
+                if (tri.hasUV) {
+                    // the computed UV coordinate if the intersection point
+                    Vector2 pqa = tri.GenerateUV(qa);
+                    Vector2 pqb = tri.GenerateUV(qb);
+                    Vector2 pa = tri.uvA;
+                    Vector2 pb = tri.uvB;
+                    Vector2 pc = tri.uvC;
+
+                    ta.SetUV(pqa, pqb, pc);
+                    tb.SetUV(pa, pqb, pqa);
+                    tc.SetUV(pa, pb, pqb);
+                }
+
+                // generate Normal coordinates if there is any
+                if (tri.hasNormal) {
+                    // the computed Normal coordinate if the intersection point
+                    Vector3 pqa = tri.GenerateNormal(qa);
+                    Vector3 pqb = tri.GenerateNormal(qb);
+                    Vector3 pa = tri.normalA;
+                    Vector3 pb = tri.normalB;
+                    Vector3 pc = tri.normalC;
+
+                    ta.SetNormal(pqa, pqb, pc);
+                    tb.SetNormal(pa, pqb, pqa);
+                    tc.SetNormal(pa, pb, pqb);
+                }
+
+                // generate Tangent coordinates if there is any
+                if (tri.hasTangent) {
+                    // the computed Tangent coordinate if the intersection point
+                    Vector4 pqa = tri.GenerateTangent(qa);
+                    Vector4 pqb = tri.GenerateTangent(qb);
+                    Vector4 pa = tri.tangentA;
+                    Vector4 pb = tri.tangentB;
+                    Vector4 pc = tri.tangentC;
+
+                    ta.SetTangent(pqa, pqb, pc);
+                    tb.SetTangent(pa, pqb, pqa);
+                    tc.SetTangent(pa, pb, pqb);
+                }
+
+                if (sa == SideOfPlane.UP) {
+                    result.AddUpperHull(tb).AddUpperHull(tc).AddLowerHull(ta);
+                } else {
+                    result.AddLowerHull(tb).AddLowerHull(tc).AddUpperHull(ta);
+                }
+            }
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/Intersector.cs.meta

@@ -0,0 +1,11 @@
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Viagg-io/Assets/EzySlice/Framework/Line.cs

@@ -0,0 +1,31 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+    public struct Line {
+        private readonly Vector3 m_pos_a;
+        private readonly Vector3 m_pos_b;
+
+        public Line(Vector3 pta, Vector3 ptb) {
+            this.m_pos_a = pta;
+            this.m_pos_b = ptb;
+        }
+
+        public float dist {
+            get { return Vector3.Distance(this.m_pos_a, this.m_pos_b); }
+        }
+
+        public float distSq {
+            get { return (this.m_pos_a - this.m_pos_b).sqrMagnitude; }
+        }
+
+        public Vector3 positionA {
+            get { return this.m_pos_a; }
+        }
+
+        public Vector3 positionB {
+            get { return this.m_pos_b; }
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/Line.cs.meta

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Viagg-io/Assets/EzySlice/Framework/Plane.cs

@@ -0,0 +1,141 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+
+    /**
+     * Quick Internal structure which checks where the point lays on the
+     * Plane. UP = Upwards from the Normal, DOWN = Downwards from the Normal
+     * ON = Point lays straight on the plane
+     */
+    public enum SideOfPlane {
+        UP,
+        DOWN,
+        ON
+    }
+
+    /**
+     * Represents a simple 3D Plane structure with a position
+     * and direction which extends infinitely in its axis. This provides
+     * an optimal structure for collision tests for the slicing framework.
+     */
+    public struct Plane {
+        private Vector3 m_normal;
+        private float m_dist;
+
+        // this is for editor debugging only! do NOT try to access this
+        // variable at runtime, we will be stripping it out for final
+        // builds
+#if UNITY_EDITOR
+        private Transform trans_ref;
+#endif
+
+        public Plane(Vector3 pos, Vector3 norm) {
+            this.m_normal = norm;
+            this.m_dist = Vector3.Dot(norm, pos);
+
+            // this is for editor debugging only!
+#if UNITY_EDITOR
+            trans_ref = null;
+#endif
+        }
+
+        public Plane(Vector3 norm, float dot) {
+            this.m_normal = norm;
+            this.m_dist = dot;
+
+            // this is for editor debugging only!
+#if UNITY_EDITOR
+            trans_ref = null;
+#endif
+        }
+        
+        public Plane(Vector3 a, Vector3 b, Vector3 c) {
+            m_normal = Vector3.Normalize(Vector3.Cross(b - a, c - a));
+            m_dist = -Vector3.Dot(m_normal, a);
+            
+            // this is for editor debugging only!
+#if UNITY_EDITOR
+            trans_ref = null;
+#endif
+        }
+
+        public void Compute(Vector3 pos, Vector3 norm) {
+            this.m_normal = norm;
+            this.m_dist = Vector3.Dot(norm, pos);
+        }
+
+        public void Compute(Transform trans) {
+            Compute(trans.position, trans.up);
+
+            // this is for editor debugging only!
+#if UNITY_EDITOR
+            trans_ref = trans;
+#endif
+        }
+
+        public void Compute(GameObject obj) {
+            Compute(obj.transform);
+        }
+
+        public Vector3 normal {
+            get { return this.m_normal; }
+        }
+
+        public float dist {
+            get { return this.m_dist; }
+        }
+
+        /**
+         * Checks which side of the plane the point lays on.
+         */
+        public SideOfPlane SideOf(Vector3 pt) {
+            float result = Vector3.Dot(m_normal, pt) - m_dist;
+
+            if (result > Intersector.Epsilon) {
+                return SideOfPlane.UP;
+            }
+
+            if (result < -Intersector.Epsilon) {
+                return SideOfPlane.DOWN;
+            }
+
+            return SideOfPlane.ON;
+        }
+
+        /**
+         * Editor only DEBUG functionality. This should not be compiled in the final
+         * Version.
+         */
+        public void OnDebugDraw() {
+            OnDebugDraw(Color.white);
+        }
+
+        public void OnDebugDraw(Color drawColor) {
+            // NOTE -> Gizmos are only supported in the editor. We will keep these function
+            // signatures for consistancy however at final build, these will do nothing
+            // TO/DO -> Should we throw a runtime exception if this function tried to get executed
+            // at runtime?
+#if UNITY_EDITOR
+
+            if (trans_ref == null) {
+                return;
+            }
+
+            Color prevColor = Gizmos.color;
+            Matrix4x4 prevMatrix = Gizmos.matrix;
+
+            // TO-DO
+            Gizmos.matrix = Matrix4x4.TRS(trans_ref.position, trans_ref.rotation, trans_ref.localScale);
+            Gizmos.color = drawColor;
+
+            Gizmos.DrawWireCube(Vector3.zero, new Vector3(1.0f, 0.0f, 1.0f));
+
+            Gizmos.color = prevColor;
+            Gizmos.matrix = prevMatrix;
+
+#endif
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/Plane.cs.meta

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+  defaultReferences: []
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Viagg-io/Assets/EzySlice/Framework/TextureRegion.cs

@@ -0,0 +1,115 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+    /**
+     * TextureRegion defines a region of a specific texture which can be used
+     * for custom UV Mapping Routines.
+     * 
+     * TextureRegions are always stored in normalized UV Coordinate space between
+     * 0.0f and 1.0f
+     */
+    public struct TextureRegion {
+        private readonly float pos_start_x;
+        private readonly float pos_start_y;
+        private readonly float pos_end_x;
+        private readonly float pos_end_y;
+
+        public TextureRegion(float startX, float startY, float endX, float endY) {
+            this.pos_start_x = startX;
+            this.pos_start_y = startY;
+            this.pos_end_x = endX;
+            this.pos_end_y = endY;
+        }
+
+        public float startX { get { return this.pos_start_x; } }
+        public float startY { get { return this.pos_start_y; } }
+        public float endX { get { return this.pos_end_x; } }
+        public float endY { get { return this.pos_end_y; } }
+
+        public Vector2 start { get { return new Vector2(startX, startY); } }
+        public Vector2 end { get { return new Vector2(endX, endY); } }
+
+        /**
+         * Perform a mapping of a UV coordinate (computed in 0,1 space)
+         * into the new coordinates defined by the provided TextureRegion
+         */
+        public Vector2 Map(Vector2 uv) {
+            return Map(uv.x, uv.y);
+        }
+
+        /**
+         * Perform a mapping of a UV coordinate (computed in 0,1 space)
+         * into the new coordinates defined by the provided TextureRegion
+         */
+        public Vector2 Map(float x, float y) {
+            float mappedX = MAP(x, 0.0f, 1.0f, pos_start_x, pos_end_x);
+            float mappedY = MAP(y, 0.0f, 1.0f, pos_start_y, pos_end_y);
+
+            return new Vector2(mappedX, mappedY);
+        }
+
+        /**
+         * Our mapping function to map arbitrary values into our required texture region
+         */
+        private static float MAP(float x, float in_min, float in_max, float out_min, float out_max) {
+            return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+        }
+    }
+
+    /**
+     * Define our TextureRegion extension to easily calculate
+     * from a Texture2D Object.
+     */
+    public static class TextureRegionExtension {
+
+        /**
+         * Helper function to quickly calculate the Texture Region from a material.
+         * This extension function will use the mainTexture component to perform the
+         * calculation. 
+         * 
+         * Will throw a null exception if the texture does not exist. See
+         * Texture.getTextureRegion() for function details.
+         */
+        public static TextureRegion GetTextureRegion(this Material mat,
+            int pixX,
+            int pixY,
+            int pixWidth,
+            int pixHeight) {
+            return mat.mainTexture.GetTextureRegion(pixX, pixY, pixWidth, pixHeight);
+        }
+
+        /**
+         * Using a Texture2D, calculate and return a specific TextureRegion
+         * Coordinates are provided in pixel coordinates where 0,0 is the
+         * bottom left corner of the texture.
+         * 
+         * The texture region will automatically be calculated to ensure that it
+         * will fit inside the provided texture. 
+         */
+        public static TextureRegion GetTextureRegion(this Texture tex,
+            int pixX,
+            int pixY,
+            int pixWidth,
+            int pixHeight) {
+            int textureWidth = tex.width;
+            int textureHeight = tex.height;
+
+            // ensure we are not referencing out of bounds coordinates
+            // relative to our texture
+            int calcWidth = Mathf.Min(textureWidth, pixWidth);
+            int calcHeight = Mathf.Min(textureHeight, pixHeight);
+            int calcX = Mathf.Min(Mathf.Abs(pixX), textureWidth);
+            int calcY = Mathf.Min(Mathf.Abs(pixY), textureHeight);
+
+            float startX = calcX / (float) textureWidth;
+            float startY = calcY / (float) textureHeight;
+            float endX = (calcX + calcWidth) / (float) textureWidth;
+            float endY = (calcY + calcHeight) / (float) textureHeight;
+
+            // texture region is a struct which is allocated on the stack
+            return new TextureRegion(startX, startY, endX, endY);
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/TextureRegion.cs.meta

@@ -0,0 +1,11 @@
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Viagg-io/Assets/EzySlice/Framework/Triangle.cs

@@ -0,0 +1,349 @@
+using UnityEngine;
+
+namespace EzySlice {
+    /**
+     * Represents a simple 3D Triangle structure with position
+     * and UV map. The UV is required if the slicer needs
+     * to recalculate the new UV position for texture mapping.
+     */
+    public struct Triangle {
+        // the points which represent this triangle
+        // these have to be set and are immutable. Cannot be
+        // changed once set
+        private readonly Vector3 m_pos_a;
+        private readonly Vector3 m_pos_b;
+        private readonly Vector3 m_pos_c;
+
+        // the UV coordinates of this triangle
+        // these are optional and may not be set
+        private bool m_uv_set;
+        private Vector2 m_uv_a;
+        private Vector2 m_uv_b;
+        private Vector2 m_uv_c;
+
+        // the Normals of the Vertices
+        // these are optional and may not be set
+        private bool m_nor_set;
+        private Vector3 m_nor_a;
+        private Vector3 m_nor_b;
+        private Vector3 m_nor_c;
+
+        // the Tangents of the Vertices
+        // these are optional and may not be set
+        private bool m_tan_set;
+        private Vector4 m_tan_a;
+        private Vector4 m_tan_b;
+        private Vector4 m_tan_c;
+
+        public Triangle(Vector3 posa,
+            Vector3 posb,
+            Vector3 posc) {
+            this.m_pos_a = posa;
+            this.m_pos_b = posb;
+            this.m_pos_c = posc;
+
+            this.m_uv_set = false;
+            this.m_uv_a = Vector2.zero;
+            this.m_uv_b = Vector2.zero;
+            this.m_uv_c = Vector2.zero;
+
+            this.m_nor_set = false;
+            this.m_nor_a = Vector3.zero;
+            this.m_nor_b = Vector3.zero;
+            this.m_nor_c = Vector3.zero;
+
+            this.m_tan_set = false;
+            this.m_tan_a = Vector4.zero;
+            this.m_tan_b = Vector4.zero;
+            this.m_tan_c = Vector4.zero;
+        }
+
+        public Vector3 positionA {
+            get { return this.m_pos_a; }
+        }
+
+        public Vector3 positionB {
+            get { return this.m_pos_b; }
+        }
+
+        public Vector3 positionC {
+            get { return this.m_pos_c; }
+        }
+
+        public bool hasUV {
+            get { return this.m_uv_set; }
+        }
+
+        public void SetUV(Vector2 uvA, Vector2 uvB, Vector2 uvC) {
+            this.m_uv_a = uvA;
+            this.m_uv_b = uvB;
+            this.m_uv_c = uvC;
+
+            this.m_uv_set = true;
+        }
+
+        public Vector2 uvA {
+            get { return this.m_uv_a; }
+        }
+
+        public Vector2 uvB {
+            get { return this.m_uv_b; }
+        }
+
+        public Vector2 uvC {
+            get { return this.m_uv_c; }
+        }
+
+        public bool hasNormal {
+            get { return this.m_nor_set; }
+        }
+
+        public void SetNormal(Vector3 norA, Vector3 norB, Vector3 norC) {
+            this.m_nor_a = norA;
+            this.m_nor_b = norB;
+            this.m_nor_c = norC;
+
+            this.m_nor_set = true;
+        }
+
+        public Vector3 normalA {
+            get { return this.m_nor_a; }
+        }
+
+        public Vector3 normalB {
+            get { return this.m_nor_b; }
+        }
+
+        public Vector3 normalC {
+            get { return this.m_nor_c; }
+        }
+
+        public bool hasTangent {
+            get { return this.m_tan_set; }
+        }
+
+        public void SetTangent(Vector4 tanA, Vector4 tanB, Vector4 tanC) {
+            this.m_tan_a = tanA;
+            this.m_tan_b = tanB;
+            this.m_tan_c = tanC;
+
+            this.m_tan_set = true;
+        }
+
+        public Vector4 tangentA {
+            get { return this.m_tan_a; }
+        }
+
+        public Vector4 tangentB {
+            get { return this.m_tan_b; }
+        }
+
+        public Vector4 tangentC {
+            get { return this.m_tan_c; }
+        }
+
+        /**
+         * Compute and set the tangents of this triangle
+         * Derived From https://answers.unity.com/questions/7789/calculating-tangents-vector4.html
+         */
+        public void ComputeTangents() {
+            // computing tangents requires both UV and normals set
+            if (!m_nor_set || !m_uv_set) {
+                return;
+            }
+
+            Vector3 v1 = m_pos_a;
+            Vector3 v2 = m_pos_b;
+            Vector3 v3 = m_pos_c;
+
+            Vector2 w1 = m_uv_a;
+            Vector2 w2 = m_uv_b;
+            Vector2 w3 = m_uv_c;
+
+            float x1 = v2.x - v1.x;
+            float x2 = v3.x - v1.x;
+            float y1 = v2.y - v1.y;
+            float y2 = v3.y - v1.y;
+            float z1 = v2.z - v1.z;
+            float z2 = v3.z - v1.z;
+
+            float s1 = w2.x - w1.x;
+            float s2 = w3.x - w1.x;
+            float t1 = w2.y - w1.y;
+            float t2 = w3.y - w1.y;
+
+            float r = 1.0f / (s1 * t2 - s2 * t1);
+
+            Vector3 sdir = new Vector3((t2 * x1 - t1 * x2) * r, (t2 * y1 - t1 * y2) * r, (t2 * z1 - t1 * z2) * r);
+            Vector3 tdir = new Vector3((s1 * x2 - s2 * x1) * r, (s1 * y2 - s2 * y1) * r, (s1 * z2 - s2 * z1) * r);
+
+            Vector3 n1 = m_nor_a;
+            Vector3 nt1 = sdir;
+
+            Vector3.OrthoNormalize(ref n1, ref nt1);
+            Vector4 tanA = new Vector4(nt1.x, nt1.y, nt1.z, (Vector3.Dot(Vector3.Cross(n1, nt1), tdir) < 0.0f) ? -1.0f : 1.0f);
+
+            Vector3 n2 = m_nor_b;
+            Vector3 nt2 = sdir;
+
+            Vector3.OrthoNormalize(ref n2, ref nt2);
+            Vector4 tanB = new Vector4(nt2.x, nt2.y, nt2.z, (Vector3.Dot(Vector3.Cross(n2, nt2), tdir) < 0.0f) ? -1.0f : 1.0f);
+
+            Vector3 n3 = m_nor_c;
+            Vector3 nt3 = sdir;
+
+            Vector3.OrthoNormalize(ref n3, ref nt3);
+            Vector4 tanC = new Vector4(nt3.x, nt3.y, nt3.z, (Vector3.Dot(Vector3.Cross(n3, nt3), tdir) < 0.0f) ? -1.0f : 1.0f);
+
+            // finally set the tangents of this object
+            SetTangent(tanA, tanB, tanC);
+        }
+
+        /**
+         * Calculate the Barycentric coordinate weight values u-v-w for Point p in respect to the provided
+         * triangle. This is useful for computing new UV coordinates for arbitrary points.
+         */
+        public Vector3 Barycentric(Vector3 p) {
+            Vector3 a = m_pos_a;
+            Vector3 b = m_pos_b;
+            Vector3 c = m_pos_c;
+
+            Vector3 m = Vector3.Cross(b - a, c - a);
+
+            float nu;
+            float nv;
+            float ood;
+
+            float x = Mathf.Abs(m.x);
+            float y = Mathf.Abs(m.y);
+            float z = Mathf.Abs(m.z);
+
+            // compute areas of plane with largest projections
+            if (x >= y && x >= z) {
+                // area of PBC in yz plane
+                nu = Intersector.TriArea2D(p.y, p.z, b.y, b.z, c.y, c.z);
+                // area of PCA in yz plane
+                nv = Intersector.TriArea2D(p.y, p.z, c.y, c.z, a.y, a.z);
+                // 1/2*area of ABC in yz plane
+                ood = 1.0f / m.x;
+            } else if (y >= x && y >= z) {
+                // project in xz plane
+                nu = Intersector.TriArea2D(p.x, p.z, b.x, b.z, c.x, c.z);
+                nv = Intersector.TriArea2D(p.x, p.z, c.x, c.z, a.x, a.z);
+                ood = 1.0f / -m.y;
+            } else {
+                // project in xy plane
+                nu = Intersector.TriArea2D(p.x, p.y, b.x, b.y, c.x, c.y);
+                nv = Intersector.TriArea2D(p.x, p.y, c.x, c.y, a.x, a.y);
+                ood = 1.0f / m.z;
+            }
+
+            float u = nu * ood;
+            float v = nv * ood;
+            float w = 1.0f - u - v;
+
+            return new Vector3(u, v, w);
+        }
+
+        /**
+         * Generate a set of new UV coordinates for the provided point pt in respect to Triangle.
+         * 
+         * Uses weight values for the computation, so this triangle must have UV's set to return
+         * the correct results. Otherwise Vector2.zero will be returned. check via hasUV().
+         */
+        public Vector2 GenerateUV(Vector3 pt) {
+            // if not set, result will be zero, quick exit
+            if (!m_uv_set) {
+                return Vector2.zero;
+            }
+
+            Vector3 weights = Barycentric(pt);
+
+            return (weights.x * m_uv_a) + (weights.y * m_uv_b) + (weights.z * m_uv_c);
+        }
+
+        /**
+         * Generates a set of new Normal coordinates for the provided point pt in respect to Triangle.
+         * 
+         * Uses weight values for the computation, so this triangle must have Normal's set to return
+         * the correct results. Otherwise Vector3.zero will be returned. check via hasNormal().
+         */
+        public Vector3 GenerateNormal(Vector3 pt) {
+            // if not set, result will be zero, quick exit
+            if (!m_nor_set) {
+                return Vector3.zero;
+            }
+
+            Vector3 weights = Barycentric(pt);
+
+            return (weights.x * m_nor_a) + (weights.y * m_nor_b) + (weights.z * m_nor_c);
+        }
+
+        /**
+         * Generates a set of new Tangent coordinates for the provided point pt in respect to Triangle.
+         * 
+         * Uses weight values for the computation, so this triangle must have Tangent's set to return
+         * the correct results. Otherwise Vector4.zero will be returned. check via hasTangent().
+         */
+        public Vector4 GenerateTangent(Vector3 pt) {
+            // if not set, result will be zero, quick exit
+            if (!m_nor_set) {
+                return Vector4.zero;
+            }
+
+            Vector3 weights = Barycentric(pt);
+
+            return (weights.x * m_tan_a) + (weights.y * m_tan_b) + (weights.z * m_tan_c);
+        }
+
+        /**
+         * Helper function to split this triangle by the provided plane and store
+         * the results inside the IntersectionResult structure.
+         * Returns true on success or false otherwise
+         */
+        public bool Split(Plane pl, IntersectionResult result) {
+            Intersector.Intersect(pl, this, result);
+
+            return result.isValid;
+        }
+
+        /**
+         * Check the triangle winding order, if it's Clock Wise or Counter Clock Wise 
+         */
+        public bool IsCW() {
+            return SignedSquare(m_pos_a, m_pos_b, m_pos_c) >= float.Epsilon;
+        }
+
+        /**
+         * Returns the Signed square of a given triangle, useful for checking the
+         * winding order
+         */
+        public static float SignedSquare(Vector3 a, Vector3 b, Vector3 c) {
+            return (a.x * (b.y * c.z - b.z * c.y) -
+                a.y * (b.x * c.z - b.z * c.x) +
+                a.z * (b.x * c.y - b.y * c.x));
+        }
+
+        /**
+         * Editor only DEBUG functionality. This should not be compiled in the final
+         * Version.
+         */
+        public void OnDebugDraw() {
+            OnDebugDraw(Color.white);
+        }
+
+        public void OnDebugDraw(Color drawColor) {
+#if UNITY_EDITOR
+            Color prevColor = Gizmos.color;
+
+            Gizmos.color = drawColor;
+
+            Gizmos.DrawLine(positionA, positionB);
+            Gizmos.DrawLine(positionB, positionC);
+            Gizmos.DrawLine(positionC, positionA);
+
+            Gizmos.color = prevColor;
+#endif
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/Triangle.cs.meta

@@ -0,0 +1,11 @@
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Viagg-io/Assets/EzySlice/Framework/Triangulator.cs

@@ -0,0 +1,199 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+
+    /**
+     * Contains static functionality for performing Triangulation on arbitrary vertices.
+     * Read the individual function descriptions for specific details.
+     */
+    public sealed class Triangulator {
+
+        /**
+         * Represents a 3D Vertex which has been mapped onto a 2D surface
+         * and is mainly used in MonotoneChain to triangulate a set of vertices
+         * against a flat plane.
+         */
+        internal struct Mapped2D {
+            private readonly Vector3 original;
+            private readonly Vector2 mapped;
+
+            public Mapped2D(Vector3 newOriginal, Vector3 u, Vector3 v) {
+                this.original = newOriginal;
+                this.mapped = new Vector2(Vector3.Dot(newOriginal, u), Vector3.Dot(newOriginal, v));
+            }
+
+            public Vector2 mappedValue {
+                get { return this.mapped; }
+            }
+
+            public Vector3 originalValue {
+                get { return this.original; }
+            }
+        }
+
+        /**
+         * Overloaded variant of MonotoneChain which will calculate UV coordinates of the Triangles
+         * between 0.0 and 1.0 (default).
+         * 
+         * See MonotoneChain(vertices, normal, tri, TextureRegion) for full explanation
+         */
+        public static bool MonotoneChain(List<Vector3> vertices, Vector3 normal, out List<Triangle> tri) {
+            // default texture region is in coordinates 0,0 to 1,1
+            return MonotoneChain(vertices, normal, out tri, new TextureRegion(0.0f, 0.0f, 1.0f, 1.0f));
+        }
+
+        /**
+         * O(n log n) Convex Hull Algorithm. 
+         * Accepts a list of vertices as Vector3 and triangulates them according to a projection
+         * plane defined as planeNormal. Algorithm will output vertices, indices and UV coordinates
+         * as arrays
+         */
+        public static bool MonotoneChain(List<Vector3> vertices, Vector3 normal, out List<Triangle> tri, TextureRegion texRegion) {
+            int count = vertices.Count;
+
+            // we cannot triangulate less than 3 points. Use minimum of 3 points
+            if (count < 3) {
+                tri = null;
+                return false;
+            }
+
+            // first, we map from 3D points into a 2D plane represented by the provided normal
+            Vector3 u = Vector3.Normalize(Vector3.Cross(normal, Vector3.up));
+            if (Vector3.zero == u) {
+                u = Vector3.Normalize(Vector3.Cross(normal, Vector3.forward));
+            }
+            Vector3 v = Vector3.Cross(u, normal);
+
+            // generate an array of mapped values
+            Mapped2D[] mapped = new Mapped2D[count];
+
+            // these values will be used to generate new UV coordinates later on
+            float maxDivX = float.MinValue;
+            float maxDivY = float.MinValue;
+            float minDivX = float.MaxValue;
+            float minDivY = float.MaxValue;
+
+            // map the 3D vertices into the 2D mapped values
+            for (int i = 0; i < count; i++) {
+                Vector3 vertToAdd = vertices[i];
+
+                Mapped2D newMappedValue = new Mapped2D(vertToAdd, u, v);
+                Vector2 mapVal = newMappedValue.mappedValue;
+
+                // grab our maximal values so we can map UV's in a proper range
+                maxDivX = Mathf.Max(maxDivX, mapVal.x);
+                maxDivY = Mathf.Max(maxDivY, mapVal.y);
+                minDivX = Mathf.Min(minDivX, mapVal.x);
+                minDivY = Mathf.Min(minDivY, mapVal.y);
+
+                mapped[i] = newMappedValue;
+            }
+
+            // sort our newly generated array values
+            Array.Sort<Mapped2D>(mapped, (a, b) => {
+                Vector2 x = a.mappedValue;
+                Vector2 p = b.mappedValue;
+
+                return (x.x < p.x || (x.x == p.x && x.y < p.y)) ? -1 : 1;
+            });
+
+            // our final hull mappings will end up in here
+            Mapped2D[] hulls = new Mapped2D[count + 1];
+
+            int k = 0;
+
+            // build the lower hull of the chain
+            for (int i = 0; i < count; i++) {
+                while (k >= 2) {
+                    Vector2 mA = hulls[k - 2].mappedValue;
+                    Vector2 mB = hulls[k - 1].mappedValue;
+                    Vector2 mC = mapped[i].mappedValue;
+
+                    if (Intersector.TriArea2D(mA.x, mA.y, mB.x, mB.y, mC.x, mC.y) > 0.0f) {
+                        break;
+                    }
+
+                    k--;
+                }
+
+                hulls[k++] = mapped[i];
+            }
+
+            // build the upper hull of the chain
+            for (int i = count - 2, t = k + 1; i >= 0; i--) {
+                while (k >= t) {
+                    Vector2 mA = hulls[k - 2].mappedValue;
+                    Vector2 mB = hulls[k - 1].mappedValue;
+                    Vector2 mC = mapped[i].mappedValue;
+
+                    if (Intersector.TriArea2D(mA.x, mA.y, mB.x, mB.y, mC.x, mC.y) > 0.0f) {
+                        break;
+                    }
+
+                    k--;
+                }
+
+                hulls[k++] = mapped[i];
+            }
+
+            // finally we can build our mesh, generate all the variables
+            // and fill them up
+            int vertCount = k - 1;
+            int triCount = (vertCount - 2) * 3;
+
+            // this should not happen, but here just in case
+            if (vertCount < 3) {
+                tri = null;
+                return false;
+            }
+
+            // ensure List does not dynamically grow, performing copy ops each time!
+            tri = new List<Triangle>(triCount / 3);
+
+            float width = maxDivX - minDivX;
+            float height = maxDivY - minDivY;
+
+            int indexCount = 1;
+
+            // generate both the vertices and uv's in this loop
+            for (int i = 0; i < triCount; i += 3) {
+                // the Vertices in our triangle
+                Mapped2D posA = hulls[0];
+                Mapped2D posB = hulls[indexCount];
+                Mapped2D posC = hulls[indexCount + 1];
+
+                // generate UV Maps
+                Vector2 uvA = posA.mappedValue;
+                Vector2 uvB = posB.mappedValue;
+                Vector2 uvC = posC.mappedValue;
+
+                uvA.x = (uvA.x - minDivX) / width;
+                uvA.y = (uvA.y - minDivY) / height;
+
+                uvB.x = (uvB.x - minDivX) / width;
+                uvB.y = (uvB.y - minDivY) / height;
+
+                uvC.x = (uvC.x - minDivX) / width;
+                uvC.y = (uvC.y - minDivY) / height;
+
+                Triangle newTriangle = new Triangle(posA.originalValue, posB.originalValue, posC.originalValue);
+
+                // ensure our UV coordinates are mapped into the requested TextureRegion
+                newTriangle.SetUV(texRegion.Map(uvA), texRegion.Map(uvB), texRegion.Map(uvC));
+
+                // the normals is the same for all vertices since the final mesh is completly flat
+                newTriangle.SetNormal(normal, normal, normal);
+                newTriangle.ComputeTangents();
+
+                tri.Add(newTriangle);
+
+                indexCount++;
+            }
+
+            return true;
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Framework/Triangulator.cs.meta

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Viagg-io/Assets/EzySlice/SlicedHull.cs

@@ -0,0 +1,141 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+
+    /**
+     * The final generated data structure from a slice operation. This provides easy access
+     * to utility functions and the final Mesh data for each section of the HULL.
+     */
+    public sealed class SlicedHull {
+        private Mesh upper_hull;
+        private Mesh lower_hull;
+
+        public SlicedHull(Mesh upperHull, Mesh lowerHull) {
+            this.upper_hull = upperHull;
+            this.lower_hull = lowerHull;
+        }
+
+        public GameObject CreateUpperHull(GameObject original) {
+            return CreateUpperHull(original, null);
+        }
+
+        public GameObject CreateUpperHull(GameObject original, Material crossSectionMat) {
+            GameObject newObject = CreateUpperHull();
+
+            if (newObject != null) {
+                newObject.transform.localPosition = original.transform.localPosition;
+                newObject.transform.localRotation = original.transform.localRotation;
+                newObject.transform.localScale = original.transform.localScale;
+
+                Material[] shared = original.GetComponent<MeshRenderer>().sharedMaterials;
+                Mesh mesh = original.GetComponent<MeshFilter>().sharedMesh;
+
+                // nothing changed in the hierarchy, the cross section must have been batched
+                // with the submeshes, return as is, no need for any changes
+                if (mesh.subMeshCount == upper_hull.subMeshCount) {
+                    // the the material information
+                    newObject.GetComponent<Renderer>().sharedMaterials = shared;
+
+                    return newObject;
+                }
+
+                // otherwise the cross section was added to the back of the submesh array because
+                // it uses a different material. We need to take this into account
+                Material[] newShared = new Material[shared.Length + 1];
+
+                // copy our material arrays across using native copy (should be faster than loop)
+                System.Array.Copy(shared, newShared, shared.Length);
+                newShared[shared.Length] = crossSectionMat;
+
+                // the the material information
+                newObject.GetComponent<Renderer>().sharedMaterials = newShared;
+            }
+
+            return newObject;
+        }
+
+        public GameObject CreateLowerHull(GameObject original) {
+            return CreateLowerHull(original, null);
+        }
+
+        public GameObject CreateLowerHull(GameObject original, Material crossSectionMat) {
+            GameObject newObject = CreateLowerHull();
+
+            if (newObject != null) {
+                newObject.transform.localPosition = original.transform.localPosition;
+                newObject.transform.localRotation = original.transform.localRotation;
+                newObject.transform.localScale = original.transform.localScale;
+
+                Material[] shared = original.GetComponent<MeshRenderer>().sharedMaterials;
+                Mesh mesh = original.GetComponent<MeshFilter>().sharedMesh;
+
+                // nothing changed in the hierarchy, the cross section must have been batched
+                // with the submeshes, return as is, no need for any changes
+                if (mesh.subMeshCount == lower_hull.subMeshCount) {
+                    // the the material information
+                    newObject.GetComponent<Renderer>().sharedMaterials = shared;
+
+                    return newObject;
+                }
+
+                // otherwise the cross section was added to the back of the submesh array because
+                // it uses a different material. We need to take this into account
+                Material[] newShared = new Material[shared.Length + 1];
+
+                // copy our material arrays across using native copy (should be faster than loop)
+                System.Array.Copy(shared, newShared, shared.Length);
+                newShared[shared.Length] = crossSectionMat;
+
+                // the the material information
+                newObject.GetComponent<Renderer>().sharedMaterials = newShared;
+            }
+
+            return newObject;
+        }
+
+        /**
+         * Generate a new GameObject from the upper hull of the mesh
+         * This function will return null if upper hull does not exist
+         */
+        public GameObject CreateUpperHull() {
+            return CreateEmptyObject("Upper_Hull", upper_hull);
+        }
+
+        /**
+         * Generate a new GameObject from the Lower hull of the mesh
+         * This function will return null if lower hull does not exist
+         */
+        public GameObject CreateLowerHull() {
+            return CreateEmptyObject("Lower_Hull", lower_hull);
+        }
+
+        public Mesh upperHull {
+            get { return this.upper_hull; }
+        }
+
+        public Mesh lowerHull {
+            get { return this.lower_hull; }
+        }
+
+        /**
+         * Helper function which will create a new GameObject to be able to add
+         * a new mesh for rendering and return.
+         */
+        private static GameObject CreateEmptyObject(string name, Mesh hull) {
+            if (hull == null) {
+                return null;
+            }
+
+            GameObject newObject = new GameObject(name);
+
+            newObject.AddComponent<MeshRenderer>();
+            MeshFilter filter = newObject.AddComponent<MeshFilter>();
+
+            filter.mesh = hull;
+
+            return newObject;
+        }
+    }
+}

Viagg-io/Assets/EzySlice/SlicedHull.cs.meta

@@ -0,0 +1,11 @@
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Viagg-io/Assets/EzySlice/Slicer.cs

@@ -0,0 +1,481 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace EzySlice {
+
+    /**
+     * Contains methods for slicing GameObjects
+     */
+    public sealed class Slicer {
+
+        /**
+         * An internal class for storing internal submesh values
+         */
+        internal class SlicedSubmesh {
+            public readonly List<Triangle> upperHull = new List<Triangle>();
+            public readonly List<Triangle> lowerHull = new List<Triangle>();
+
+            /**
+             * Check if the submesh has had any UV's added.
+             * NOTE -> This should be supported properly
+             */
+            public bool hasUV {
+                get {
+                    // what is this abomination??
+                    return upperHull.Count > 0 ? upperHull[0].hasUV : lowerHull.Count > 0 && lowerHull[0].hasUV;
+                }
+            }
+
+            /**
+             * Check if the submesh has had any Normals added.
+             * NOTE -> This should be supported properly
+             */
+            public bool hasNormal {
+                get {
+                    // what is this abomination??
+                    return upperHull.Count > 0 ? upperHull[0].hasNormal : lowerHull.Count > 0 && lowerHull[0].hasNormal;
+                }
+            }
+
+            /**
+             * Check if the submesh has had any Tangents added.
+             * NOTE -> This should be supported properly
+             */
+            public bool hasTangent {
+                get {
+                    // what is this abomination??
+                    return upperHull.Count > 0 ? upperHull[0].hasTangent : lowerHull.Count > 0 && lowerHull[0].hasTangent;
+                }
+            }
+
+            /**
+             * Check if proper slicing has occured for this submesh. Slice occured if there
+             * are triangles in both the upper and lower hulls
+             */
+            public bool isValid {
+                get {
+                    return upperHull.Count > 0 && lowerHull.Count > 0;
+                }
+            }
+        }
+
+        /**
+         * Helper function to accept a gameobject which will transform the plane
+         * approprietly before the slice occurs
+         * See -> Slice(Mesh, Plane) for more info
+         */
+        public static SlicedHull Slice(GameObject obj, Plane pl, TextureRegion crossRegion, Material crossMaterial) {
+            
+            // cannot continue without a proper filter
+            if (!obj.TryGetComponent<MeshFilter>(out var filter)) {
+                Debug.LogWarning("EzySlice::Slice -> Provided GameObject must have a MeshFilter Component.");
+
+                return null;
+            }
+
+            
+            // cannot continue without a proper renderer
+            if (!obj.TryGetComponent<MeshRenderer>(out var renderer)) {
+                Debug.LogWarning("EzySlice::Slice -> Provided GameObject must have a MeshRenderer Component.");
+
+                return null;
+            }
+
+            Material[] materials = renderer.sharedMaterials;
+
+            Mesh mesh = filter.sharedMesh;
+
+            // cannot slice a mesh that doesn't exist
+            if (mesh == null) {
+                Debug.LogWarning("EzySlice::Slice -> Provided GameObject must have a Mesh that is not NULL.");
+
+                return null;
+            }
+
+            int submeshCount = mesh.subMeshCount;
+
+            // to make things straightforward, exit without slicing if the materials and mesh
+            // array don't match. This shouldn't happen anyway
+            if (materials.Length != submeshCount) {
+                Debug.LogWarning("EzySlice::Slice -> Provided Material array must match the length of submeshes.");
+
+                return null;
+            }
+
+            // we need to find the index of the material for the cross section.
+            // default to the end of the array
+            int crossIndex = materials.Length;
+
+            // for cases where the sliced material is null, we will append the cross section to the end
+            // of the submesh array, this is because the application may want to set/change the material
+            // after slicing has occured, so we don't assume anything
+            if (crossMaterial != null) {
+                for (int i = 0; i < crossIndex; i++) {
+                    if (materials[i] == crossMaterial) {
+                        crossIndex = i;
+                        break;
+                    }
+                }
+            }
+
+            return Slice(mesh, pl, crossRegion, crossIndex);
+        }
+
+        /**
+         * Slice the gameobject mesh (if any) using the Plane, which will generate
+         * a maximum of 2 other Meshes.
+         * This function will recalculate new UV coordinates to ensure textures are applied
+         * properly.
+         * Returns null if no intersection has been found or the GameObject does not contain
+         * a valid mesh to cut.
+         */
+        public static SlicedHull Slice(Mesh sharedMesh, Plane pl, TextureRegion region, int crossIndex) {
+            if (sharedMesh == null) {
+                return null;
+            }
+
+            Vector3[] verts = sharedMesh.vertices;
+            Vector2[] uv = sharedMesh.uv;
+            Vector3[] norm = sharedMesh.normals;
+            Vector4[] tan = sharedMesh.tangents;
+
+            int submeshCount = sharedMesh.subMeshCount;
+
+            // each submesh will be sliced and placed in its own array structure
+            SlicedSubmesh[] slices = new SlicedSubmesh[submeshCount];
+            // the cross section hull is common across all submeshes
+            List<Vector3> crossHull = new List<Vector3>();
+
+            // we reuse this object for all intersection tests
+            IntersectionResult result = new IntersectionResult();
+
+            // see if we would like to split the mesh using uv, normals and tangents
+            bool genUV = verts.Length == uv.Length;
+            bool genNorm = verts.Length == norm.Length;
+            bool genTan = verts.Length == tan.Length;
+
+            // iterate over all the submeshes individually. vertices and indices
+            // are all shared within the submesh
+            for (int submesh = 0; submesh < submeshCount; submesh++) {
+                int[] indices = sharedMesh.GetTriangles(submesh);
+                int indicesCount = indices.Length;
+
+                SlicedSubmesh mesh = new SlicedSubmesh();
+
+                // loop through all the mesh vertices, generating upper and lower hulls
+                // and all intersection points
+                for (int index = 0; index < indicesCount; index += 3) {
+                    int i0 = indices[index + 0];
+                    int i1 = indices[index + 1];
+                    int i2 = indices[index + 2];
+
+                    Triangle newTri = new Triangle(verts[i0], verts[i1], verts[i2]);
+
+                    // generate UV if available
+                    if (genUV) {
+                        newTri.SetUV(uv[i0], uv[i1], uv[i2]);
+                    }
+
+                    // generate normals if available
+                    if (genNorm) {
+                        newTri.SetNormal(norm[i0], norm[i1], norm[i2]);
+                    }
+
+                    // generate tangents if available
+                    if (genTan) {
+                        newTri.SetTangent(tan[i0], tan[i1], tan[i2]);
+                    }
+
+                    // slice this particular triangle with the provided
+                    // plane
+                    if (newTri.Split(pl, result)) {
+                        int upperHullCount = result.upperHullCount;
+                        int lowerHullCount = result.lowerHullCount;
+                        int interHullCount = result.intersectionPointCount;
+
+                        for (int i = 0; i < upperHullCount; i++) {
+                            mesh.upperHull.Add(result.upperHull[i]);
+                        }
+
+                        for (int i = 0; i < lowerHullCount; i++) {
+                            mesh.lowerHull.Add(result.lowerHull[i]);
+                        }
+
+                        for (int i = 0; i < interHullCount; i++) {
+                            crossHull.Add(result.intersectionPoints[i]);
+                        }
+                    } else {
+                        SideOfPlane sa = pl.SideOf(verts[i0]);
+                        SideOfPlane sb = pl.SideOf(verts[i1]);
+                        SideOfPlane sc = pl.SideOf(verts[i2]);
+
+                        SideOfPlane side = SideOfPlane.ON;
+                        if (sa != SideOfPlane.ON)
+                        {
+                            side = sa;
+                        }
+                        
+                        if (sb != SideOfPlane.ON)
+                        {
+                            Debug.Assert(side == SideOfPlane.ON || side == sb);
+                            side = sb;
+                        }
+                        
+                        if (sc != SideOfPlane.ON)
+                        {
+                            Debug.Assert(side == SideOfPlane.ON || side == sc);
+                            side = sc;
+                        }
+
+                        if (side == SideOfPlane.UP || side == SideOfPlane.ON) {
+                            mesh.upperHull.Add(newTri);
+                        } else {
+                            mesh.lowerHull.Add(newTri);
+                        }
+                    }
+                }
+
+                // register into the index
+                slices[submesh] = mesh;
+            }
+
+            // check if slicing actually occured
+            for (int i = 0; i < slices.Length; i++) {
+                // check if at least one of the submeshes was sliced. If so, stop checking
+                // because we need to go through the generation step
+                if (slices[i] != null && slices[i].isValid) {
+                    return CreateFrom(slices, CreateFrom(crossHull, pl.normal, region), crossIndex);
+                }
+            }
+
+            // no slicing occured, just return null to signify
+            return null;
+        }
+
+        /**
+         * Generates a single SlicedHull from a set of cut submeshes 
+         */
+        private static SlicedHull CreateFrom(SlicedSubmesh[] meshes, List<Triangle> cross, int crossSectionIndex) {
+            int submeshCount = meshes.Length;
+
+            int upperHullCount = 0;
+            int lowerHullCount = 0;
+
+            // get the total amount of upper, lower and intersection counts
+            for (int submesh = 0; submesh < submeshCount; submesh++) {
+                upperHullCount += meshes[submesh].upperHull.Count;
+                lowerHullCount += meshes[submesh].lowerHull.Count;
+            }
+
+            Mesh upperHull = CreateUpperHull(meshes, upperHullCount, cross, crossSectionIndex);
+            Mesh lowerHull = CreateLowerHull(meshes, lowerHullCount, cross, crossSectionIndex);
+
+            return new SlicedHull(upperHull, lowerHull);
+        }
+
+        private static Mesh CreateUpperHull(SlicedSubmesh[] mesh, int total, List<Triangle> crossSection, int crossSectionIndex) {
+            return CreateHull(mesh, total, crossSection, crossSectionIndex, true);
+        }
+
+        private static Mesh CreateLowerHull(SlicedSubmesh[] mesh, int total, List<Triangle> crossSection, int crossSectionIndex) {
+            return CreateHull(mesh, total, crossSection, crossSectionIndex, false);
+        }
+
+        /**
+         * Generate a single Mesh HULL of either the UPPER or LOWER hulls. 
+         */
+        private static Mesh CreateHull(SlicedSubmesh[] meshes, int total, List<Triangle> crossSection, int crossIndex, bool isUpper) {
+            if (total <= 0) {
+                return null;
+            }
+
+            int submeshCount = meshes.Length;
+            int crossCount = crossSection != null ? crossSection.Count : 0;
+
+            Mesh newMesh = new Mesh();
+            newMesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
+            
+            int arrayLen = (total + crossCount) * 3;
+
+            bool hasUV = meshes[0].hasUV;
+            bool hasNormal = meshes[0].hasNormal;
+            bool hasTangent = meshes[0].hasTangent;
+
+            // vertices and uv's are common for all submeshes
+            Vector3[] newVertices = new Vector3[arrayLen];
+            Vector2[] newUvs = hasUV ? new Vector2[arrayLen] : null;
+            Vector3[] newNormals = hasNormal ? new Vector3[arrayLen] : null;
+            Vector4[] newTangents = hasTangent ? new Vector4[arrayLen] : null;
+
+            // each index refers to our submesh triangles
+            List<int[]> triangles = new List<int[]>(submeshCount);
+
+            int vIndex = 0;
+
+            // first we generate all our vertices, uv's and triangles
+            for (int submesh = 0; submesh < submeshCount; submesh++) {
+                // pick the hull we will be playing around with
+                List<Triangle> hull = isUpper ? meshes[submesh].upperHull : meshes[submesh].lowerHull;
+                int hullCount = hull.Count;
+
+                int[] indices = new int[hullCount * 3];
+
+                // fill our mesh arrays
+                for (int i = 0, triIndex = 0; i < hullCount; i++, triIndex += 3) {
+                    Triangle newTri = hull[i];
+
+                    int i0 = vIndex + 0;
+                    int i1 = vIndex + 1;
+                    int i2 = vIndex + 2;
+
+                    // add the vertices
+                    newVertices[i0] = newTri.positionA;
+                    newVertices[i1] = newTri.positionB;
+                    newVertices[i2] = newTri.positionC;
+
+                    // add the UV coordinates if any
+                    if (hasUV) {
+                        newUvs[i0] = newTri.uvA;
+                        newUvs[i1] = newTri.uvB;
+                        newUvs[i2] = newTri.uvC;
+                    }
+
+                    // add the Normals if any
+                    if (hasNormal) {
+                        newNormals[i0] = newTri.normalA;
+                        newNormals[i1] = newTri.normalB;
+                        newNormals[i2] = newTri.normalC;
+                    }
+
+                    // add the Tangents if any
+                    if (hasTangent) {
+                        newTangents[i0] = newTri.tangentA;
+                        newTangents[i1] = newTri.tangentB;
+                        newTangents[i2] = newTri.tangentC;
+                    }
+
+                    // triangles are returned in clocwise order from the
+                    // intersector, no need to sort these
+                    indices[triIndex] = i0;
+                    indices[triIndex + 1] = i1;
+                    indices[triIndex + 2] = i2;
+
+                    vIndex += 3;
+                }
+
+                // add triangles to the index for later generation
+                triangles.Add(indices);
+            }
+
+            // generate the cross section required for this particular hull
+            if (crossSection != null && crossCount > 0) {
+                int[] crossIndices = new int[crossCount * 3];
+
+                for (int i = 0, triIndex = 0; i < crossCount; i++, triIndex += 3) {
+                    Triangle newTri = crossSection[i];
+
+                    int i0 = vIndex + 0;
+                    int i1 = vIndex + 1;
+                    int i2 = vIndex + 2;
+
+                    // add the vertices
+                    newVertices[i0] = newTri.positionA;
+                    newVertices[i1] = newTri.positionB;
+                    newVertices[i2] = newTri.positionC;
+
+                    // add the UV coordinates if any
+                    if (hasUV) {
+                        newUvs[i0] = newTri.uvA;
+                        newUvs[i1] = newTri.uvB;
+                        newUvs[i2] = newTri.uvC;
+                    }
+
+                    // add the Normals if any
+                    if (hasNormal) {
+                        // invert the normals dependiong on upper or lower hull
+                        if (isUpper) {
+                            newNormals[i0] = -newTri.normalA;
+                            newNormals[i1] = -newTri.normalB;
+                            newNormals[i2] = -newTri.normalC;
+                        } else {
+                            newNormals[i0] = newTri.normalA;
+                            newNormals[i1] = newTri.normalB;
+                            newNormals[i2] = newTri.normalC;
+                        }
+                    }
+
+                    // add the Tangents if any
+                    if (hasTangent) {
+                        newTangents[i0] = newTri.tangentA;
+                        newTangents[i1] = newTri.tangentB;
+                        newTangents[i2] = newTri.tangentC;
+                    }
+
+                    // add triangles in clockwise for upper
+                    // and reversed for lower hulls, to ensure the mesh
+                    // is facing the right direction
+                    if (isUpper) {
+                        crossIndices[triIndex] = i0;
+                        crossIndices[triIndex + 1] = i1;
+                        crossIndices[triIndex + 2] = i2;
+                    } else {
+                        crossIndices[triIndex] = i0;
+                        crossIndices[triIndex + 1] = i2;
+                        crossIndices[triIndex + 2] = i1;
+                    }
+
+                    vIndex += 3;
+                }
+
+                // add triangles to the index for later generation
+                if (triangles.Count <= crossIndex) {
+                    triangles.Add(crossIndices);
+                } else {
+                    // otherwise, we need to merge the triangles for the provided subsection
+                    int[] prevTriangles = triangles[crossIndex];
+                    int[] merged = new int[prevTriangles.Length + crossIndices.Length];
+
+                    System.Array.Copy(prevTriangles, merged, prevTriangles.Length);
+                    System.Array.Copy(crossIndices, 0, merged, prevTriangles.Length, crossIndices.Length);
+
+                    // replace the previous array with the new merged array
+                    triangles[crossIndex] = merged;
+                }
+            }
+
+            int totalTriangles = triangles.Count;
+
+            newMesh.subMeshCount = totalTriangles;
+            // fill the mesh structure
+            newMesh.vertices = newVertices;
+
+            if (hasUV) {
+                newMesh.uv = newUvs;
+            }
+
+            if (hasNormal) {
+                newMesh.normals = newNormals;
+            }
+
+            if (hasTangent) {
+                newMesh.tangents = newTangents;
+            }
+
+            // add the submeshes
+            for (int i = 0; i < totalTriangles; i++) {
+                newMesh.SetTriangles(triangles[i], i, false);
+            }
+
+            return newMesh;
+        }
+
+        /**
+         * Generate Two Meshes (an upper and lower) cross section from a set of intersection
+         * points and a plane normal. Intersection Points do not have to be in order.
+         */
+        private static List<Triangle> CreateFrom(List<Vector3> intPoints, Vector3 planeNormal, TextureRegion region) {
+            return Triangulator.MonotoneChain(intPoints, planeNormal, out List<Triangle> tris, region) ? tris : null;
+        }
+    }
+}

Viagg-io/Assets/EzySlice/Slicer.cs.meta

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Viagg-io/Assets/EzySlice/SlicerExtensions.cs

@@ -0,0 +1,98 @@
+using System.Collections;
+using UnityEngine;
+
+namespace EzySlice {
+    /**
+     * Define Extension methods for easy access to slicer functionality
+     */
+    public static class SlicerExtensions {
+
+        /**
+         * SlicedHull Return functions and appropriate overrides!
+         */
+        public static SlicedHull Slice(this GameObject obj, Plane pl, Material crossSectionMaterial = null) {
+            return Slice(obj, pl, new TextureRegion(0.0f, 0.0f, 1.0f, 1.0f), crossSectionMaterial);
+        }
+
+        public static SlicedHull Slice(this GameObject obj, Vector3 position, Vector3 direction, Material crossSectionMaterial = null) {
+            return Slice(obj, position, direction, new TextureRegion(0.0f, 0.0f, 1.0f, 1.0f), crossSectionMaterial);
+        }
+
+        public static SlicedHull Slice(this GameObject obj, Vector3 position, Vector3 direction, TextureRegion textureRegion, Material crossSectionMaterial = null) {
+            Plane cuttingPlane = new Plane();
+
+            Matrix4x4 mat = obj.transform.worldToLocalMatrix;
+            Matrix4x4 transpose = mat.transpose;
+            Matrix4x4 inv = transpose.inverse;
+
+            Vector3 refUp = inv.MultiplyVector(direction).normalized;
+            Vector3 refPt = obj.transform.InverseTransformPoint(position);
+
+            cuttingPlane.Compute(refPt, refUp);
+
+            return Slice(obj, cuttingPlane, textureRegion, crossSectionMaterial);
+        }
+
+        public static SlicedHull Slice(this GameObject obj, Plane pl, TextureRegion textureRegion, Material crossSectionMaterial = null) {
+            return Slicer.Slice(obj, pl, textureRegion, crossSectionMaterial);
+        }
+
+        /**
+         * These functions (and overrides) will return the final indtaniated GameObjects types
+         */
+        public static GameObject[] SliceInstantiate(this GameObject obj, Plane pl) {
+            return SliceInstantiate(obj, pl, new TextureRegion(0.0f, 0.0f, 1.0f, 1.0f));
+        }
+
+        public static GameObject[] SliceInstantiate(this GameObject obj, Vector3 position, Vector3 direction) {
+            return SliceInstantiate(obj, position, direction, null);
+        }
+
+        public static GameObject[] SliceInstantiate(this GameObject obj, Vector3 position, Vector3 direction, Material crossSectionMat) {
+            return SliceInstantiate(obj, position, direction, new TextureRegion(0.0f, 0.0f, 1.0f, 1.0f), crossSectionMat);
+        }
+
+        public static GameObject[] SliceInstantiate(this GameObject obj, Vector3 position, Vector3 direction, TextureRegion cuttingRegion, Material crossSectionMaterial = null) {
+            EzySlice.Plane cuttingPlane = new EzySlice.Plane();
+
+            Matrix4x4 mat = obj.transform.worldToLocalMatrix;
+            Matrix4x4 transpose = mat.transpose;
+            Matrix4x4 inv = transpose.inverse;
+
+            Vector3 refUp = inv.MultiplyVector(direction).normalized;
+            Vector3 refPt = obj.transform.InverseTransformPoint(position);
+
+            cuttingPlane.Compute(refPt, refUp);
+
+            return SliceInstantiate(obj, cuttingPlane, cuttingRegion, crossSectionMaterial);
+        }
+
+        public static GameObject[] SliceInstantiate(this GameObject obj, Plane pl, TextureRegion cuttingRegion, Material crossSectionMaterial = null) {
+            SlicedHull slice = Slicer.Slice(obj, pl, cuttingRegion, crossSectionMaterial);
+
+            if (slice == null) {
+                return null;
+            }
+
+            GameObject upperHull = slice.CreateUpperHull(obj, crossSectionMaterial);
+            GameObject lowerHull = slice.CreateLowerHull(obj, crossSectionMaterial);
+
+            if (upperHull != null && lowerHull != null) {
+                return new GameObject[] { upperHull, lowerHull };
+            }
+
+            // otherwise return only the upper hull
+            if (upperHull != null) {
+                return new GameObject[] { upperHull };
+            }
+
+            // otherwise return only the lower hull
+            if (lowerHull != null) {
+                return new GameObject[] { lowerHull };
+            }
+
+            // nothing to return, so return nothing!
+            return null;
+        }
+    }
+}

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Viagg-io/Assets/Prefabs/_INTERACTABLES/GO.INTERACTABLES.Zwiebel01.prefab

@@ -305,7 +305,7 @@ MonoBehaviour:
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Viagg-io/Assets/Prefabs/_INTERACTABLES/kuechen-messer-interactable.prefab

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       Data4: 1516590243
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Viagg-io/Assets/Resources/BuildDateTime.txt

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-2025-02-06T06:28:40.9426791Z
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Viagg-io/Assets/Scripts/SliceObjectsVR.cs

@@ -0,0 +1,84 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using EzySlice;
+using UnityEngine.InputSystem;
+using UnityEngine.XR.Interaction.Toolkit;
+
+public class SliceObjectsVR : MonoBehaviour
+{
+    public Transform startSlicePoint;
+    public Transform endSlicePoint;
+    public LayerMask sliceableLayer;
+    public Material crossSectionMaterial;
+    public float cutForce = 0.1f;
+    public float explosionRadius = 0.1f;
+
+    private Vector3 lastSlicerPosition; // Letzte Position von SLICER
+    private Vector3 slicerVelocity; // Berechnete Geschwindigkeit von SLICER
+
+    void Start()
+    {
+        lastSlicerPosition = transform.position; // Startposition speichern
+    }
+
+    void FixedUpdate()
+    {
+        // Berechnung der Geschwindigkeit von SLICER
+        slicerVelocity = (transform.position - lastSlicerPosition) / Time.fixedDeltaTime;
+        lastSlicerPosition = transform.position;
+
+        // Debugging: Prüfen, ob die Velocity sinnvoll ist
+        //Debug.Log($"SLICER Velocity: {slicerVelocity}, Magnitude: {slicerVelocity.magnitude}");
+
+        // Prüfen, ob ein schneidbares Objekt getroffen wird
+        bool hasHit = Physics.Linecast(startSlicePoint.position, endSlicePoint.position, out RaycastHit hit, sliceableLayer);
+        if (hasHit)
+        {
+            GameObject target = hit.transform.gameObject;
+            Slice(target);
+        }
+    }
+
+    public void Slice(GameObject target)
+    {
+        //Debug.Log("Slice Function active: " + target.name);
+
+        // Normalenvektor für die Schnittebene berechnen
+        Vector3 planeNormal = Vector3.Cross(endSlicePoint.position - startSlicePoint.position, slicerVelocity);
+        planeNormal.Normalize();
+
+        //Debug.Log($"Direction: {planeNormal}, Magnitude: {planeNormal.magnitude}");
+        //Debug.Log($"Velocity: {slicerVelocity}, Magnitude: {slicerVelocity.magnitude}");
+
+        // Prüfen, ob das Objekt geschnitten werden kann
+        SlicedHull hull = target.Slice(endSlicePoint.position, planeNormal);
+
+        if (hull != null)
+        {
+            //Debug.Log("Hull isn't empty");
+
+            GameObject upperHull = hull.CreateUpperHull(target, crossSectionMaterial);
+            SetupSlicedComponent(upperHull);
+
+            GameObject lowerHull = hull.CreateLowerHull(target, crossSectionMaterial);
+            SetupSlicedComponent(lowerHull);
+
+            Destroy(target);
+        }
+    }
+
+    public void SetupSlicedComponent(GameObject slicedObject)
+    {
+        //Debug.Log("New object created");
+        Rigidbody rb = slicedObject.AddComponent<Rigidbody>(); //add Rigidbody
+        MeshCollider collider = slicedObject.AddComponent<MeshCollider>();  //add Meshcolider
+        collider.convex = true;  //make Collider convex
+        rb.AddExplosionForce(cutForce, slicedObject.transform.position, explosionRadius); //add force for realistic behaviour
+        slicedObject.layer = 6; // 6 = "sliceableLayer"
+        slicedObject.AddComponent<XRGrabInteractable>(); //add grabbable Script
+        slicedObject.AddComponent<ComponentController>(); //add BT-Controller
+        slicedObject.AddComponent<OnGrabSound>(); //add grab sound
+        slicedObject.AddComponent<OnCollideSound>(); //add collision sound
+    }
+}

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Viagg-io/ProjectSettings/DynamicsManager.asset

@@ -3,7 +3,7 @@
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+  serializedVersion: 14
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   m_BounceThreshold: 2
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   m_ContactsGeneration: 1
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+  m_LayerCollisionMatrix: ffffffffffffffffdffffffffffffffffffffffffbffffff7fffffffbfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
-  m_AutoSimulation: 1
+  m_SimulationMode: 0
   m_AutoSyncTransforms: 1
   m_ReuseCollisionCallbacks: 1
+  m_InvokeCollisionCallbacks: 1
   m_ClothInterCollisionSettingsToggle: 0
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   m_ContactPairsMode: 0

Viagg-io/ProjectSettings/EditorBuildSettings.asset

@@ -5,8 +5,12 @@ EditorBuildSettings:
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   serializedVersion: 2
   m_Scenes:
-  - enabled: 1
+  - enabled: 0
     path: Assets/Scenes/Test-Scene-Nick.unity
     guid: 3b4a6e5db0165e344b220fcfbfe68836
+  - enabled: 1
+    path: Assets/Scenes/Test-Scene-Nick2.unity
+    guid: 86afdeefd7cdf934d9c4db691f96a878
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Viagg-io/ProjectSettings/TagManager.asset

@@ -25,8 +25,8 @@ TagManager:
   - 
   - Water
   - UI
-  - 
+  - Sliceable
-  - 
+  - Slicer
   - 
   - hands
   - no-post-processing