public static List <List <TriMesh.Face> > RetrieveFacePatchBySelectedEdge(TriMesh mesh)
{
bool[] faceFlag = new bool[mesh.Faces.Count];
bool[] hfFlag = new bool[mesh.HalfEdges.Count];
List <List <TriMesh.Face> > all = new List <List <TriMesh.Face> >();
foreach (TriMesh.HalfEdge hf in mesh.HalfEdges)
{
if (!hfFlag[hf.Index])
{
List <TriMesh.Face> list = new List <HalfEdgeMesh.Face>();
Stack <TriMesh.HalfEdge> stack = new Stack <HalfEdgeMesh.HalfEdge>();
stack.Push(hf);
while (stack.Count != 0)
{
TriMesh.HalfEdge cur = stack.Pop();
hfFlag[cur.Index] = true;
if (!faceFlag[cur.Face.Index])
{
list.Add(cur.Face);
faceFlag[cur.Face.Index] = true;
}
TriMesh.HalfEdge[] arr = new HalfEdgeMesh.HalfEdge[]
{
cur.Opposite,
cur.Next,
cur.Previous
};
foreach (var item in arr)
{
if (!hfFlag[item.Index] &&
item.Face != null &&
item.Edge.Traits.SelectedFlag == 0)
{
stack.Push(item);
}
}
}
if (list.Count != 0)
{
all.Add(list);
}
}
}
return(all);
}
public static TriMesh.HalfEdge[] Sort(LinkedList <TriMesh.Edge> src)
{
LinkedList <TriMesh.HalfEdge> dst = new LinkedList <HalfEdgeMesh.HalfEdge>();
dst.AddLast(src.First.Value.HalfEdge0);
src.RemoveFirst();
LinkedListNode <TriMesh.Edge> node = src.First;
int count = 0;
while (node != null)
{
TriMesh.Vertex first = dst.First.Value.FromVertex;
TriMesh.Vertex last = dst.Last.Value.ToVertex;
if (node.Value.Vertex0 == first)
{
dst.AddFirst(node.Value.HalfEdge0);
src.Remove(node);
count++;
}
else if (node.Value.Vertex1 == first)
{
dst.AddFirst(node.Value.HalfEdge1);
src.Remove(node);
count++;
}
else if (node.Value.Vertex0 == last)
{
dst.AddLast(node.Value.HalfEdge1);
src.Remove(node);
count++;
}
else if (node.Value.Vertex1 == last)
{
dst.AddLast(node.Value.HalfEdge0);
src.Remove(node);
count++;
}
node = node.Next;
if (node == null && count != 0)
{
node = src.First;
count = 0;
}
}
TriMesh.HalfEdge[] arr = new HalfEdgeMesh.HalfEdge[dst.Count];
dst.CopyTo(arr, 0);
return(arr);
}
public static TriMesh.HalfEdge[] Sort(LinkedList<TriMesh.Edge> src)
{
LinkedList<TriMesh.HalfEdge> dst = new LinkedList<HalfEdgeMesh.HalfEdge>();
dst.AddLast(src.First.Value.HalfEdge0);
src.RemoveFirst();
LinkedListNode<TriMesh.Edge> node = src.First;
int count = 0;
while (node != null)
{
TriMesh.Vertex first = dst.First.Value.FromVertex;
TriMesh.Vertex last = dst.Last.Value.ToVertex;
if (node.Value.Vertex0 == first)
{
dst.AddFirst(node.Value.HalfEdge0);
src.Remove(node);
count++;
}
else if (node.Value.Vertex1 == first)
{
dst.AddFirst(node.Value.HalfEdge1);
src.Remove(node);
count++;
}
else if (node.Value.Vertex0 == last)
{
dst.AddLast(node.Value.HalfEdge1);
src.Remove(node);
count++;
}
else if (node.Value.Vertex1 == last)
{
dst.AddLast(node.Value.HalfEdge0);
src.Remove(node);
count++;
}
node = node.Next;
if (node == null && count != 0)
{
node = src.First;
count = 0;
}
}
TriMesh.HalfEdge[] arr = new HalfEdgeMesh.HalfEdge[dst.Count];
dst.CopyTo(arr, 0);
return arr;
}
public static List<List<TriMesh.Face>> RetrieveFacePatchBySelectedEdge(TriMesh mesh)
{
bool[] faceFlag = new bool[mesh.Faces.Count];
bool[] hfFlag = new bool[mesh.HalfEdges.Count];
List<List<TriMesh.Face>> all = new List<List<TriMesh.Face>>();
foreach (TriMesh.HalfEdge hf in mesh.HalfEdges)
{
if (!hfFlag[hf.Index])
{
List<TriMesh.Face> list = new List<HalfEdgeMesh.Face>();
Stack<TriMesh.HalfEdge> stack = new Stack<HalfEdgeMesh.HalfEdge>();
stack.Push(hf);
while (stack.Count != 0)
{
TriMesh.HalfEdge cur = stack.Pop();
hfFlag[cur.Index] = true;
if (!faceFlag[cur.Face.Index])
{
list.Add(cur.Face);
faceFlag[cur.Face.Index] = true;
}
TriMesh.HalfEdge[] arr = new HalfEdgeMesh.HalfEdge[]
{
cur.Opposite,
cur.Next,
cur.Previous
};
foreach (var item in arr)
{
if (!hfFlag[item.Index] &&
item.Face != null &&
item.Edge.Traits.SelectedFlag == 0)
{
stack.Push(item);
}
}
}
if (list.Count != 0)
{
all.Add(list);
}
}
}
return all;
}
public static void ComputeCornerArea(TriMesh mesh,out double[] CornerArea, out double[] PointArea)
{
CornerArea = new double[mesh.HalfEdges.Count];
PointArea = new double[mesh.Vertices.Count];
foreach (var face in mesh.Faces)
{
double area = TriMeshUtil.ComputeAreaFace(face);
TriMesh.HalfEdge[] hf = new HalfEdgeMesh.HalfEdge[]
{
face.HalfEdge,
face.HalfEdge.Next,
face.HalfEdge.Previous
};
int[] index = new int[3];
for (int i = 0; i < 3; i++)
{
index[i] = hf[i].Index;
}
Vector3D[] e = new Vector3D[3];
for (int i = 0; i < 3; i++)
{
e[i] = TriMeshUtil.GetHalfEdgeVector(hf[i].Previous);
}
double[] l2 = new double[3];
for (int i = 0; i < 3; i++)
{
l2[i] = e[i].LengthSquared;
}
double[] ew = new double[3];
for (int i = 0; i < 3; i++)
{
ew[i] = l2[i] * (l2[(i + 1) % 3] + l2[(i + 2) % 3] - l2[i]);
}
bool flag = false;
for (int i = 0; i < 3; i++)
{
if (ew[i] < 0d)
{
int a = (i + 1) % 3;
int b = (i + 2) % 3;
CornerArea[index[a]] = -0.25d * l2[b] * area / e[i].Dot(e[b]);
CornerArea[index[b]] = -0.25d * l2[a] * area / e[i].Dot(e[a]);
CornerArea[index[i]] = area - CornerArea[index[a]] - CornerArea[index[b]];
flag = true;
}
}
if (!flag)
{
double ewscale = 0.5d * area / (ew[0] + ew[1] + ew[2]);
for (int i = 0; i < 3; i++)
{
CornerArea[index[i]] = ewscale * (ew[(i + 1) % 3] + ew[(i + 2) % 3]);
}
}
for (int i = 0; i < 3; i++)
{
PointArea[hf[i].ToVertex.Index] += CornerArea[index[i]];
}
}
}
public static void ComputeCornerArea(TriMesh mesh, out double[] CornerArea, out double[] PointArea)
{
CornerArea = new double[mesh.HalfEdges.Count];
PointArea = new double[mesh.Vertices.Count];
foreach (var face in mesh.Faces)
{
double area = TriMeshUtil.ComputeAreaFace(face);
TriMesh.HalfEdge[] hf = new HalfEdgeMesh.HalfEdge[]
{
face.HalfEdge,
face.HalfEdge.Next,
face.HalfEdge.Previous
};
int[] index = new int[3];
for (int i = 0; i < 3; i++)
{
index[i] = hf[i].Index;
}
Vector3D[] e = new Vector3D[3];
for (int i = 0; i < 3; i++)
{
e[i] = TriMeshUtil.GetHalfEdgeVector(hf[i].Previous);
}
double[] l2 = new double[3];
for (int i = 0; i < 3; i++)
{
l2[i] = e[i].LengthSquared;
}
double[] ew = new double[3];
for (int i = 0; i < 3; i++)
{
ew[i] = l2[i] * (l2[(i + 1) % 3] + l2[(i + 2) % 3] - l2[i]);
}
bool flag = false;
for (int i = 0; i < 3; i++)
{
if (ew[i] < 0d)
{
int a = (i + 1) % 3;
int b = (i + 2) % 3;
CornerArea[index[a]] = -0.25d * l2[b] * area / e[i].Dot(e[b]);
CornerArea[index[b]] = -0.25d * l2[a] * area / e[i].Dot(e[a]);
CornerArea[index[i]] = area - CornerArea[index[a]] - CornerArea[index[b]];
flag = true;
}
}
if (!flag)
{
double ewscale = 0.5d * area / (ew[0] + ew[1] + ew[2]);
for (int i = 0; i < 3; i++)
{
CornerArea[index[i]] = ewscale * (ew[(i + 1) % 3] + ew[(i + 2) % 3]);
}
}
for (int i = 0; i < 3; i++)
{
PointArea[hf[i].ToVertex.Index] += CornerArea[index[i]];
}
}
}
