public void CutWithPlane(Plane plane)
{
float sTime = Time.realtimeSinceStartup;
GameObject child = gameObject.transform.GetChild(0).gameObject;
meshFilter = child.GetComponent <MeshFilter>();
mesh = meshFilter.mesh;
InitHalfEdgeMesh();
bool[] visited = new bool[heMesh.halfEdges.Count];
List <HalfEdge> newHalfEdges = new List <HalfEdge>();
int s = heMesh.halfEdges.Count;
int rightCount = 0;
int leftCount = 0;
Vector3 newVertCoord = Vector3.zero;
int onCount = 0;
/*
* Dictionary<Vector3, Vector2> uvMap = new Dictionary<Vector3, Vector2>();
* List<Vector2> uvs = new List<Vector2>();
* mesh.GetUVs(0, uvs);
* for (int i = 0; i < mesh.vertices.Length; i++)
* {
* if (!uvMap.ContainsKey(mesh.vertices[i])) {
* uvMap.Add(mesh.vertices[i], uvs[i]);
* }
* }*/
for (int i = 0; i < s; i++)
{
if (visited[i])
{
continue;
}
// mark this and the opposite as visited
HalfEdge he = heMesh.halfEdges[i];
HalfEdge heOpp = heMesh.halfEdges[he.oppositeIndex];
visited[he.index] = true;
visited[heOpp.index] = true;
// Check if intersection with plane
Vector3 v0 = heMesh.vertices[he.verIndex].v;
Vector3 v1 = heMesh.vertices[heOpp.verIndex].v;
// First Set vertex plane config
Vector3 c0 = v0 - plane.point;
Vector3 c1 = v1 - plane.point;
float c0_dot = Vector3.Dot(c0, plane.normal);
float c1_dot = Vector3.Dot(c1, plane.normal);
float eps = 0.0001f;
if (Mathf.Abs(c0_dot) < eps)
{
heMesh.vertices[he.verIndex].config = PlaneConfig.On;
}
else if (c0_dot <= -eps)
{
heMesh.vertices[he.verIndex].config = PlaneConfig.Right;
rightCount++;
}
else if (c0_dot >= eps)
{
heMesh.vertices[he.verIndex].config = PlaneConfig.Left;
leftCount++;
}
if (Mathf.Abs(c1_dot) < eps)
{
heMesh.vertices[heOpp.verIndex].config = PlaneConfig.On;
}
else if (c1_dot <= -eps)
{
rightCount++;
heMesh.vertices[heOpp.verIndex].config = PlaneConfig.Right;
}
else if (c1_dot >= eps)
{
leftCount++;
heMesh.vertices[heOpp.verIndex].config = PlaneConfig.Left;
}
float t;
Vector3 iPoint = Plane.LinePlaneIntersect(plane, v0, v1, out t);
if (t > 1.0f - eps || t < 0.0f + eps)
{
// No intersection on line segment OR parallel with plane
continue;
}
// Debug.Log(t);
// add new intersection vertex to half-edge structure
HEVertex iVert = new HEVertex();
iVert.v = iPoint;
onCount += 1;
newVertCoord += iPoint;
iVert.heIndex = (short)heMesh.halfEdges.Count;
iVert.config = PlaneConfig.On;
heMesh.vertices.Add(iVert);
HalfEdge[] newHEs = HalfEdge.CreateFromTwo(he, heOpp, (short)heMesh.halfEdges.Count, (short)(heMesh.vertices.Count - 1));
heMesh.halfEdges.Add(newHEs[0]);
heMesh.halfEdges.Add(newHEs[1]);
iPoints.Add(iPoint);
}
if (leftCount == 0 || rightCount == 0)
{
// Do nothing!!!!
return;
}
heMesh.Triangulate();
HalfEdgeMesh rightMesh = new HalfEdgeMesh();
HalfEdgeMesh leftMesh = new HalfEdgeMesh();
heMesh.SplitInLeftAndRightMesh(leftMesh, rightMesh);
GameObject copy = Instantiate(objectToCopy);
GameObject childCopy = copy.transform.GetChild(0).gameObject;
SliceableWithPlane copyDebug = copy.GetComponent <SliceableWithPlane>();
newVertCoord /= (float)onCount;
rightMesh.CapClipPlane(plane.normal, newVertCoord);
copyDebug.heMesh = rightMesh;
copyDebug.meshFilter = childCopy.GetComponent <MeshFilter>();
copyDebug.meshFilter.mesh = rightMesh.GetMesh();
// MeshFilter mfCpy = copy.GetComponent<MeshFilter>();
leftMesh.CapClipPlane(-plane.normal, newVertCoord);
meshFilter.mesh = leftMesh.GetMesh();
/*
* List<Vector2> newUVs = new List<Vector2>();
* foreach (Vector3 v in meshFilter.mesh.vertices)
* {
* if (!uvMap.ContainsKey(v))
* {
* newUVs.Add(Vector2.zero);
* } else
* {
* newUVs.Add(uvMap[v]);
* }
* }
* meshFilter.mesh.SetUVs(0, newUVs);
*/
copyDebug.cutPlane = cutPlane;
//heMesh.CreateStructureFromMesh(mesh);
//copyDebug.heMesh.CreateStructureFromMesh(copyDebug.meshFilter.mesh);
child.GetComponent <MeshCollider>().sharedMesh = null;
child.GetComponent <MeshCollider>().sharedMesh = meshFilter.mesh;
childCopy.GetComponent <MeshCollider>().sharedMesh = null;
childCopy.GetComponent <MeshCollider>().sharedMesh = copyDebug.meshFilter.mesh;
// child.GetComponent<MeshCollider>().gameObject.SetActive(true);
float eTime = Time.realtimeSinceStartup - sTime;
Debug.Log("Time taken = " + eTime);
}