/// <summary>
/// cut mesh by plane
/// </summary>
/// <param name="mesh">mesh to cut</param>
/// <param name="meshTransform">transformation of the mesh</param>
/// <param name="plane">cutting plane</param>
/// <param name="triangulateHoles">flag for triangulation of holes</param>
/// <param name="crossSectionVertexColor">this color will be assigned to cross section, valid only for vertex color shaders</param>
/// <param name="crossUV">uv mapping area for cross section</param>
/// <param name="allowOpenMesh">allow cutting of open mesh</param>
/// <returns>processing time</returns>
public float Cut(Mesh mesh, Transform meshTransform, Math.Plane plane, bool triangulateHoles, bool allowOpenMesh, ref List<CutterMesh> meshes,
Color crossSectionVertexColor, Vector4 crossUV)
{
this.crossSectionVertexColour = crossSectionVertexColor;
this.crossSectionUV = crossUV;
return Cut(mesh, meshTransform, plane, triangulateHoles, allowOpenMesh, ref meshes);
}
void Triangulate(List<Dictionary<int, int>> contours, Math.Plane plane, List<Vector3>[] vertices, List<Vector3>[] normals, List<Vector2>[] uvs,
List<Vector4>[] tangents, List<Color32>[] colors, List<int>[] triangles, bool uvCutMesh, bool useTangents, bool useColors, bool useNormals)
{
if (contours.Count == 0 || contours[0].Count < 3)
{
// Utils.Log("Contour empty!: ");
return;
}
// prepare plane matrix
var m = plane.GetPlaneMatrix();
var mInv = m.inverse;
var zShit = 0.0f;
var polygons = new List<Polygon>(contours.Count);
// construct polygons from contours
Polygon highAreaPoly = null;
foreach (var ctr in contours)
{
var polygonPoints = new Vector2[ctr.Count];
var j = 0;
foreach (var i in ctr.Values)
{
var p = mInv*vertices[0][i];
polygonPoints[j++] = p;
// save z-coordinate
zShit = p.z;
}
var polygon = new Polygon(polygonPoints);
polygons.Add(polygon);
if (highAreaPoly == null || Mathf.Abs(highAreaPoly.Area) < Mathf.Abs(polygon.Area))
{
highAreaPoly = polygon;
}
}
ExploderUtils.Assert(polygons.Count > 0, "Zero polygons!");
// test for holes
if (polygons.Count > 0)
{
var polyToRemove = new List<Polygon>();
foreach (var polygon in polygons)
{
if (polygon != highAreaPoly)
{
if (highAreaPoly.IsPointInside(polygon.Points[0]))
{
highAreaPoly.AddHole(polygon);
polyToRemove.Add(polygon);
}
}
}
foreach (var polygon in polyToRemove)
{
polygons.Remove(polygon);
}
}
var vertCounter0 = vertices[0].Count;
var vertCounter1 = vertices[1].Count;
foreach (var polygon in polygons)
{
var indices = polygon.Triangulate();
if (indices == null)
{
continue;
}
// get polygon bounding square size
var min = Mathf.Min(polygon.Min.x, polygon.Min.y);
var max = Mathf.Max(polygon.Max.x, polygon.Max.y);
var polygonSize = max - min;
// Utils.Log("PolygonSize: " + polygonSize + " " + polygon.Min + " " + polygon.Max);
// Utils.Log("Triangulate polygons: " + polygon.Points.Length);
foreach (var polyPoint in polygon.Points)
{
var p = m * new Vector3(polyPoint.x, polyPoint.y, zShit);
vertices[0].Add(p);
vertices[1].Add(p);
if (useNormals)
{
normals[0].Add(-plane.Normal);
normals[1].Add(plane.Normal);
}
if (uvCutMesh)
{
var uv0 = new Vector2((polyPoint.x - min)/polygonSize,
(polyPoint.y - min)/polygonSize);
var uv1 = new Vector2((polyPoint.x - min)/polygonSize,
(polyPoint.y - min)/polygonSize);
// normalize uv to fit cross-section uv area
var areaSizeX = crossSectionUV.z - crossSectionUV.x;
var areaSizeY = crossSectionUV.w - crossSectionUV.y;
uv0.x = crossSectionUV.x + uv0.x * areaSizeX;
uv0.y = crossSectionUV.y + uv0.y * areaSizeY;
uv1.x = crossSectionUV.x + uv1.x * areaSizeX;
uv1.y = crossSectionUV.y + uv1.y * areaSizeY;
uvs[0].Add(uv0);
uvs[1].Add(uv1);
}
else
{
uvs[0].Add(Vector2.zero);
uvs[1].Add(Vector2.zero);
}
if (useTangents)
{
// fast and dirty way to create tangents
var v0 = plane.Normal;
MeshUtils.Swap(ref v0.x, ref v0.y);
MeshUtils.Swap(ref v0.y, ref v0.z);
Vector4 tangent = Vector3.Cross(plane.Normal, v0);
tangent.w = 1.0f;
tangents[0].Add(tangent);
tangent.w = -1.0f;
tangents[1].Add(tangent);
}
if (useColors)
{
colors[0].Add(crossSectionVertexColour);
colors[1].Add(crossSectionVertexColour);
}
}
var indicesCount = indices.Count;
var j = indicesCount - 1;
for (int i = 0; i < indicesCount; i++)
{
triangles[0].Add(vertCounter0 + indices[i]);
triangles[1].Add(vertCounter1 + indices[j]);
j--;
}
vertCounter0 += polygon.Points.Length;
vertCounter1 += polygon.Points.Length;
}
}
float Cut(Mesh mesh, Transform meshTransform, Math.Plane plane, bool triangulateHoles, bool allowOpenMesh, ref List<CutterMesh> meshes)
{
var stopWatch = new Stopwatch();
stopWatch.Start();
#if PROFILING
MeasureIt.Begin("CutAllocations");
#endif
// cache mesh data
var trianglesNum = mesh.triangles.Length;
var verticesNum = mesh.vertices.Length;
var meshTriangles = mesh.triangles;
var meshTangents = mesh.tangents;
var meshColors = mesh.colors32;
var meshVertices = mesh.vertices;
var meshNormals = mesh.normals;
var meshUV = mesh.uv;
var useMeshTangents = meshTangents != null && meshTangents.Length > 0;
var useVertexColors = meshColors != null && meshColors.Length > 0;
var useNormals = meshNormals != null && meshNormals.Length > 0;
// preallocate buffers
AllocateBuffers(trianglesNum, verticesNum, useMeshTangents, useVertexColors);
CutterMesh mesh0, mesh1;
#if PROFILING
MeasureIt.End("CutAllocations");
MeasureIt.Begin("CutCycleFirstPass");
#endif
// inverse transform cutting plane
plane.InverseTransform(meshTransform);
// first pass - find complete triangles on both sides of the plane
for (int i = 0; i < trianglesNum; i += 3)
{
// get triangle points
var v0 = meshVertices[meshTriangles[i]];
var v1 = meshVertices[meshTriangles[i + 1]];
var v2 = meshVertices[meshTriangles[i + 2]];
var side0 = plane.GetSideFix(ref v0);
var side1 = plane.GetSideFix(ref v1);
var side2 = plane.GetSideFix(ref v2);
meshVertices[meshTriangles[i]] = v0;
meshVertices[meshTriangles[i + 1]] = v1;
meshVertices[meshTriangles[i + 2]] = v2;
// Utils.Log(plane.Pnt + " " + v0 + " " + v1 + " " + " " + v2);
// all points on one side
if (side0 == side1 && side1 == side2)
{
var idx = side0 ? 0 : 1;
if (meshTriangles[i] >= triCache.Length)
{
ExploderUtils.Log("TriCacheError " + meshTriangles[i] + " " + triCache.Length + " " + meshVertices.Length);
}
if (triCache[meshTriangles[i]] == 0)
{
triangles[idx].Add(triCounter[idx]);
vertices[idx].Add(meshVertices[meshTriangles[i]]);
uvs[idx].Add(meshUV[meshTriangles[i]]);
if (useNormals)
{
normals[idx].Add(meshNormals[meshTriangles[i]]);
}
if (useMeshTangents)
{
tangents[idx].Add(meshTangents[meshTriangles[i]]);
}
if (useVertexColors)
{
vertexColors[idx].Add(meshColors[meshTriangles[i]]);
}
centroid[idx] += meshVertices[meshTriangles[i]];
triCache[meshTriangles[i]] = triCounter[idx] + 1;
triCounter[idx]++;
}
else
{
triangles[idx].Add(triCache[meshTriangles[i]] - 1);
}
if (triCache[meshTriangles[i + 1]] == 0)
{
triangles[idx].Add(triCounter[idx]);
vertices[idx].Add(meshVertices[meshTriangles[i + 1]]);
uvs[idx].Add(meshUV[meshTriangles[i + 1]]);
if (useNormals)
{
normals[idx].Add(meshNormals[meshTriangles[i + 1]]);
}
if (useMeshTangents)
{
tangents[idx].Add(meshTangents[meshTriangles[i+1]]);
}
if (useVertexColors)
{
vertexColors[idx].Add(meshColors[meshTriangles[i+1]]);
}
centroid[idx] += meshVertices[meshTriangles[i + 1]];
triCache[meshTriangles[i + 1]] = triCounter[idx] + 1;
triCounter[idx]++;
}
else
{
triangles[idx].Add(triCache[meshTriangles[i + 1]] - 1);
}
if (triCache[meshTriangles[i + 2]] == 0)
{
triangles[idx].Add(triCounter[idx]);
vertices[idx].Add(meshVertices[meshTriangles[i + 2]]);
uvs[idx].Add(meshUV[meshTriangles[i + 2]]);
if (useNormals)
{
normals[idx].Add(meshNormals[meshTriangles[i + 2]]);
}
if (useMeshTangents)
{
tangents[idx].Add(meshTangents[meshTriangles[i+2]]);
}
if (useVertexColors)
{
vertexColors[idx].Add(meshColors[meshTriangles[i+2]]);
}
centroid[idx] += meshVertices[meshTriangles[i + 2]];
triCache[meshTriangles[i + 2]] = triCounter[idx] + 1;
triCounter[idx]++;
}
else
{
triangles[idx].Add(triCache[meshTriangles[i + 2]] - 1);
}
}
else
{
// intersection triangles add to list and process it in second pass
cutTris.Add(i);
}
}
if (vertices[0].Count == 0)
{
centroid[0] = meshVertices[0];
}
else
{
centroid[0] /= vertices[0].Count;
}
if (vertices[1].Count == 0)
{
centroid[1] = meshVertices[1];
}
else
{
centroid[1] /= vertices[1].Count;
}
#if PROFILING
MeasureIt.End("CutCycleFirstPass");
MeasureIt.Begin("CutCycleSecondPass");
#endif
mesh0.centroid = centroid[0];
mesh1.centroid = centroid[1];
mesh0.mesh = null;
mesh1.mesh = null;
if (cutTris.Count < 1)
{
stopWatch.Stop();
return stopWatch.ElapsedMilliseconds;
}
AllocateContours(cutTris.Count);
// second pass - cut intersecting triangles in half
foreach (var cutTri in cutTris)
{
var triangle = new Triangle
{
ids = new[] { meshTriangles[cutTri + 0], meshTriangles[cutTri + 1], meshTriangles[cutTri + 2] },
pos = new[] { meshVertices[meshTriangles[cutTri + 0]], meshVertices[meshTriangles[cutTri + 1]], meshVertices[meshTriangles[cutTri + 2]] },
normal = useNormals ? new[] { meshNormals[meshTriangles[cutTri + 0]], meshNormals[meshTriangles[cutTri + 1]], meshNormals[meshTriangles[cutTri + 2]] } : new[] { Vector3.zero, Vector3.zero, Vector3.zero },
uvs = new[] { meshUV[meshTriangles[cutTri + 0]], meshUV[meshTriangles[cutTri + 1]], meshUV[meshTriangles[cutTri + 2]] },
tangents = useMeshTangents ? new[] { meshTangents[meshTriangles[cutTri + 0]], meshTangents[meshTriangles[cutTri + 1]], meshTangents[meshTriangles[cutTri + 2]]} : new []{ Vector4.zero, Vector4.zero, Vector4.zero },
colors = useVertexColors ? new[] { meshColors[meshTriangles[cutTri + 0]], meshColors[meshTriangles[cutTri + 1]], meshColors[meshTriangles[cutTri + 2]] } : new Color32[] { Color.white, Color.white, Color.white },
};
// check points with a plane
var side0 = plane.GetSide(triangle.pos[0]);
var side1 = plane.GetSide(triangle.pos[1]);
var side2 = plane.GetSide(triangle.pos[2]);
float t0, t1;
Vector3 s0 = Vector3.zero, s1 = Vector3.zero;
var idxLeft = side0 ? 0 : 1;
var idxRight = 1 - idxLeft;
if (side0 == side1)
{
var a = plane.IntersectSegment(triangle.pos[2], triangle.pos[0], out t0, ref s0);
var b = plane.IntersectSegment(triangle.pos[2], triangle.pos[1], out t1, ref s1);
ExploderUtils.Assert(a && b, "!!!!!!!!!!!!!!!");
// left side ... 2 triangles
var s0Left = AddIntersectionPoint(s0, triangle, triangle.ids[2], triangle.ids[0], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var s1Left = AddIntersectionPoint(s1, triangle, triangle.ids[2], triangle.ids[1], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var v0Left = AddTrianglePoint(triangle.pos[0], triangle.normal[0], triangle.uvs[0], triangle.tangents[0], triangle.colors[0], triangle.ids[0], triCache, cornerVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var v1Left = AddTrianglePoint(triangle.pos[1], triangle.normal[1], triangle.uvs[1], triangle.tangents[1], triangle.colors[1], triangle.ids[1], triCache, cornerVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
// Triangle (s0, v0, s1)
triangles[idxLeft].Add(s0Left);
triangles[idxLeft].Add(v0Left);
triangles[idxLeft].Add(s1Left);
// Triangle (s1, v0, v1)
triangles[idxLeft].Add(s1Left);
triangles[idxLeft].Add(v0Left);
triangles[idxLeft].Add(v1Left);
// right side ... 1 triangle
var s0Right = AddIntersectionPoint(s0, triangle, triangle.ids[2], triangle.ids[0], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var s1Right = AddIntersectionPoint(s1, triangle, triangle.ids[2], triangle.ids[1], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var v2Right = AddTrianglePoint(triangle.pos[2], triangle.normal[2], triangle.uvs[2], triangle.tangents[2], triangle.colors[2], triangle.ids[2], triCache, cornerVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
// Triangle (v2, s0, s1)
triangles[idxRight].Add(v2Right);
triangles[idxRight].Add(s0Right);
triangles[idxRight].Add(s1Right);
// buffer intersection vertices for triangulation
if (triangulateHoles)
{
if (idxLeft == 0)
{
contour.AddTriangle(cutTri, s0Left, s1Left, s0, s1);
}
else
{
contour.AddTriangle(cutTri, s0Right, s1Right, s0, s1);
}
}
}
else if (side0 == side2)
{
var a = plane.IntersectSegment(triangle.pos[1], triangle.pos[0], out t0, ref s1);
var b = plane.IntersectSegment(triangle.pos[1], triangle.pos[2], out t1, ref s0);
ExploderUtils.Assert(a && b, "!!!!!!!!!!!!!");
// left side ... 2 triangles
var s0Left = AddIntersectionPoint(s0, triangle, triangle.ids[1], triangle.ids[2], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var s1Left = AddIntersectionPoint(s1, triangle, triangle.ids[1], triangle.ids[0], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var v0Left = AddTrianglePoint(triangle.pos[0], triangle.normal[0], triangle.uvs[0], triangle.tangents[0], triangle.colors[0], triangle.ids[0], triCache, cornerVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var v2Left = AddTrianglePoint(triangle.pos[2], triangle.normal[2], triangle.uvs[2], triangle.tangents[2], triangle.colors[2], triangle.ids[2], triCache, cornerVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
// Triangle (v2, s1, s0)
triangles[idxLeft].Add(v2Left);
triangles[idxLeft].Add(s1Left);
triangles[idxLeft].Add(s0Left);
// Triangle (v2, v0, s1)
triangles[idxLeft].Add(v2Left);
triangles[idxLeft].Add(v0Left);
triangles[idxLeft].Add(s1Left);
// right side ... 1 triangle
var s0Right = AddIntersectionPoint(s0, triangle, triangle.ids[1], triangle.ids[2], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var s1Right = AddIntersectionPoint(s1, triangle, triangle.ids[1], triangle.ids[0], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var v1Right = AddTrianglePoint(triangle.pos[1], triangle.normal[1], triangle.uvs[1], triangle.tangents[1], triangle.colors[1], triangle.ids[1], triCache, cornerVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
// Triangle (s0, s1, v1)
triangles[idxRight].Add(s0Right);
triangles[idxRight].Add(s1Right);
triangles[idxRight].Add(v1Right);
// buffer intersection vertices for triangulation
if (triangulateHoles)
{
if (idxLeft == 0)
{
contour.AddTriangle(cutTri, s0Left, s1Left, s0, s1);
}
else
{
contour.AddTriangle(cutTri, s0Right, s1Right, s0, s1);
}
}
}
else
{
var a = plane.IntersectSegment(triangle.pos[0], triangle.pos[1], out t0, ref s0);
var b = plane.IntersectSegment(triangle.pos[0], triangle.pos[2], out t1, ref s1);
ExploderUtils.Assert(a && b, "!!!!!!!!!!!!!");
// right side ... 2 triangles
var s0Right = AddIntersectionPoint(s0, triangle, triangle.ids[0], triangle.ids[1], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var s1Right = AddIntersectionPoint(s1, triangle, triangle.ids[0], triangle.ids[2], cutVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var v1Right = AddTrianglePoint(triangle.pos[1], triangle.normal[1], triangle.uvs[1], triangle.tangents[1], triangle.colors[1], triangle.ids[1], triCache, cornerVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
var v2Right = AddTrianglePoint(triangle.pos[2], triangle.normal[2], triangle.uvs[2], triangle.tangents[2], triangle.colors[2], triangle.ids[2], triCache, cornerVertCache[idxRight], vertices[idxRight], normals[idxRight], uvs[idxRight], tangents[idxRight], vertexColors[idxRight], useMeshTangents, useVertexColors, useNormals);
// Triangle (v2, s1, v1)
triangles[idxRight].Add(v2Right);
triangles[idxRight].Add(s1Right);
triangles[idxRight].Add(v1Right);
// Triangle (s1, s0, v1)
triangles[idxRight].Add(s1Right);
triangles[idxRight].Add(s0Right);
triangles[idxRight].Add(v1Right);
// left side ... 1 triangle
var s0Left = AddIntersectionPoint(s0, triangle, triangle.ids[0], triangle.ids[1], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var s1Left = AddIntersectionPoint(s1, triangle, triangle.ids[0], triangle.ids[2], cutVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
var v0Left = AddTrianglePoint(triangle.pos[0], triangle.normal[0], triangle.uvs[0], triangle.tangents[0], triangle.colors[0], triangle.ids[0], triCache, cornerVertCache[idxLeft], vertices[idxLeft], normals[idxLeft], uvs[idxLeft], tangents[idxLeft], vertexColors[idxLeft], useMeshTangents, useVertexColors, useNormals);
// Triangle (s1, v0, s0)
triangles[idxLeft].Add(s1Left);
triangles[idxLeft].Add(v0Left);
triangles[idxLeft].Add(s0Left);
// buffer intersection vertices for triangulation
if (triangulateHoles)
{
if (idxLeft == 0)
{
contour.AddTriangle(cutTri, s0Left, s1Left, s0, s1);
}
else
{
contour.AddTriangle(cutTri, s0Right, s1Right, s0, s1);
}
}
}
}
#if PROFILING
MeasureIt.End("CutCycleSecondPass");
#endif
if (triangulateHoles)
{
#if PROFILING
MeasureIt.Begin("FindContours");
#endif
contour.FindContours();
if (contour.contour.Count == 0 || contour.contour[0].Count < 3)
{
if (allowOpenMesh)
{
triangulateHoles = false;
}
else
{
stopWatch.Stop();
return stopWatch.ElapsedMilliseconds;
}
}
#if PROFILING
MeasureIt.End("FindContours");
#endif
}
List<int>[] trianglesCut = null;
if (triangulateHoles)
{
#if PROFILING
MeasureIt.Begin("Triangulate");
#endif
trianglesCut = new List<int>[2]
{new List<int>(contour.MidPointsCount), new List<int>(contour.MidPointsCount)};
Triangulate(contour.contour, plane, vertices, normals, uvs, tangents, vertexColors, trianglesCut, true,
useMeshTangents, useVertexColors, useNormals);
#if PROFILING
MeasureIt.End("Triangulate");
#endif
}
if (vertices[0].Count > 3 && vertices[1].Count > 3)
{
#if PROFILING
MeasureIt.Begin("CutEndCopyBack");
#endif
mesh0.mesh = new Mesh();
mesh1.mesh = new Mesh();
var verticesArray0 = vertices[0].ToArray();
var verticesArray1 = vertices[1].ToArray();
mesh0.mesh.vertices = verticesArray0;
mesh0.mesh.uv = uvs[0].ToArray();
mesh1.mesh.vertices = verticesArray1;
mesh1.mesh.uv = uvs[1].ToArray();
if (useNormals)
{
mesh0.mesh.normals = normals[0].ToArray();
mesh1.mesh.normals = normals[1].ToArray();
}
if (useMeshTangents)
{
mesh0.mesh.tangents = tangents[0].ToArray();
mesh1.mesh.tangents = tangents[1].ToArray();
}
if (useVertexColors)
{
mesh0.mesh.colors32 = vertexColors[0].ToArray();
mesh1.mesh.colors32 = vertexColors[1].ToArray();
}
if (trianglesCut != null && trianglesCut[0].Count > 3)
{
triangles[0].AddRange(trianglesCut[0]);
triangles[1].AddRange(trianglesCut[1]);
}
mesh0.mesh.triangles = triangles[0].ToArray();
mesh1.mesh.triangles = triangles[1].ToArray();
if (!triangulateHoles)
{
// don't triangulate holes means the mesh is a 2d plane
// it is better to recalculate centroid to get precise center not just an approximation
mesh0.centroid = Vector3.zero;
mesh1.centroid = Vector3.zero;
foreach (var p in vertices[0])
{
mesh0.centroid += p;
}
mesh0.centroid /= vertices[0].Count;
foreach (var p in vertices[1])
{
mesh1.centroid += p;
}
mesh1.centroid /= vertices[1].Count;
}
#if PROFILING
MeasureIt.End("CutEndCopyBack");
#endif
meshes = new List<CutterMesh> { mesh0, mesh1 };
stopWatch.Stop();
return stopWatch.ElapsedMilliseconds;
}
stopWatch.Stop();
// UnityEngine.Debug.Log("Empty cut! " + vertices[0].Count + " " + vertices[1].Count);
return stopWatch.ElapsedMilliseconds;
}
bool ProcessCutter(out long cuttingTime)
{
ExploderUtils.Assert(state == State.ProcessCutter || state == State.DryRun, "Wrong state!");
var stopWatch = new Stopwatch();
stopWatch.Start();
bool cutting = true;
bool timeBudgetStop = false;
var cycleCounter = 0;
while (cutting)
{
cycleCounter++;
if (cycleCounter > settings.TargetFragments)
{
ExploderUtils.Log("Explode Infinite loop!");
break;
}
var fragmentsCount = meshSet.Count;
newFragments.Clear();
meshToRemove.Clear();
cutting = false;
foreach (var mesh in meshSet)
{
if (levelCount[mesh.level] > 0)
{
// TODO: for possible improvements change random value to something more sofisticated
var randomPlaneNormal = Random.insideUnitSphere;
if (!mesh.transform)
{
continue;
}
var plane = new Core.Math.Plane(randomPlaneNormal, mesh.transform.TransformPoint(mesh.centroid));
var triangulateHoles = true;
var crossSectionVertexColour = Color.white;
var crossSectionUV = new Vector4(0, 0, 1, 1);
if (mesh.option)
{
triangulateHoles = !mesh.option.Plane2D;
crossSectionVertexColour = mesh.option.CrossSectionVertexColor;
crossSectionUV = mesh.option.CrossSectionUV;
splitMeshIslands |= mesh.option.SplitMeshIslands;
}
if (settings.Use2DCollision)
{
triangulateHoles = false;
}
List<CutterMesh> meshes = null;
cutter.Cut(mesh.mesh, mesh.transform, plane, triangulateHoles, settings.AllowOpenMeshCutting, ref meshes, crossSectionVertexColour, crossSectionUV);
cutting = true;
if (meshes != null)
{
foreach (var cutterMesh in meshes)
{
newFragments.Add(new CutMesh
{
mesh = cutterMesh.mesh,
centroid = cutterMesh.centroid,
material = mesh.material,
vertices = mesh.vertices,
transform = mesh.transform,
distance = mesh.distance,
level = mesh.level,
fragments = mesh.fragments,
original = mesh.original,
skinnedOriginal = mesh.skinnedOriginal,
parent = mesh.transform.parent,
position = mesh.transform.position,
rotation = mesh.transform.rotation,
localScale = mesh.transform.localScale,
option = mesh.option,
});
}
meshToRemove.Add(mesh);
levelCount[mesh.level] -= 1;
// stop this madness!
if (fragmentsCount + newFragments.Count - meshToRemove.Count >= settings.TargetFragments)
{
cuttingTime = stopWatch.ElapsedMilliseconds;
meshSet.ExceptWith(meshToRemove);
meshSet.UnionWith(newFragments);
return true;
}
// computation took more than settings.FrameBudget ...
if (stopWatch.ElapsedMilliseconds > settings.FrameBudget)
{
timeBudgetStop = true;
break;
}
}
}
}
meshSet.ExceptWith(meshToRemove);
meshSet.UnionWith(newFragments);
if (timeBudgetStop)
{
break;
}
}
cuttingTime = stopWatch.ElapsedMilliseconds;
// explosion is finished
if (!timeBudgetStop)
{
return true;
}
return false;
}