public void DrawTrivialConnection(TriMesh mesh,
Vector3D[] faceVectors, int N)
{
double eps = 1e-3;
double perAngle = 2 * Math.PI / N;
for (int i = 0; i < mesh.Faces.Count; i++)
{
Vector3D vector = Vector3D.Normalize(faceVectors[i]);
TriMesh.Face face = mesh.Faces[i];
Vector3D center = TriMeshUtil.GetMidPoint(face);
Vector3D normal = TriMeshUtil.ComputeNormalFace(face);
double inradius = TriMeshUtil.ComputeInradius(face);
Quaternion rotate = Quaternion.RotationAxis(normal, perAngle);
Quaternion v = new Quaternion(vector, 0);
for (int j = 0; j < N; j++)
{
Vector3D a = center + inradius * v.ImagePart;
//Vector3D b = center - inradius * v.ImagePart;
v = rotate * v * rotate.Conjugate();
GL.Begin(BeginMode.Lines);
GL.Vertex3(a.x, a.y, a.z);
GL.Vertex3(center.x, center.y, center.z);
GL.End();
}
}
}
private TriMesh ChangeTopologyLoop(TriMesh sourceMesh)
{
TriMesh newMesh = new TriMesh();
newMesh.Clear();
vMap = new HalfEdgeMesh.Vertex[sourceMesh.Vertices.Count];
eMap = new HalfEdgeMesh.Vertex[sourceMesh.Edges.Count];
foreach (var v in sourceMesh.Vertices)
{
vMap[v.Index] = newMesh.Vertices.Add(new VertexTraits(v.Traits.Position));
}
foreach (var edge in sourceMesh.Edges)
{
eMap[edge.Index] = newMesh.Vertices.Add(
new VertexTraits(TriMeshUtil.GetMidPoint(edge)));
}
foreach (TriMesh.Face face in sourceMesh.Faces)
{
foreach (var hf in face.Halfedges)
{
newMesh.Faces.AddTriangles(eMap[hf.Edge.Index],
vMap[hf.ToVertex.Index], eMap[hf.Next.Edge.Index]);
}
newMesh.Faces.AddTriangles(
eMap[face.HalfEdge.Previous.Edge.Index],
eMap[face.HalfEdge.Edge.Index],
eMap[face.HalfEdge.Next.Edge.Index]);
}
return(newMesh);
}
public static void KMean(TriMesh mesh)
{
Dictionary <int, Cluster> dict = new Dictionary <int, Cluster>();
Queue <TriMesh.Face> queue = new Queue <HalfEdgeMesh.Face>();
foreach (var face in mesh.Faces)
{
if (face.Traits.SelectedFlag != 0)
{
dict[face.Traits.SelectedFlag] = new Cluster();
dict[face.Traits.SelectedFlag].Add(TriMeshUtil.GetMidPoint(face));
queue.Enqueue(face);
}
}
while (queue.Count != 0)
{
TriMesh.Face center = queue.Dequeue();
foreach (var round in center.Faces)
{
if (round.Traits.SelectedFlag == 0)
{
int index = GetNearest(round, dict);
dict[index].Add(TriMeshUtil.GetMidPoint(round));
round.Traits.SelectedFlag = (byte)index;
queue.Enqueue(round);
}
}
}
}
private TriMesh ChangeTopologyInit(TriMesh sourceMesh)
{
TriMesh mesh = new TriMesh();
vMap = new HalfEdgeMesh.Vertex[sourceMesh.Vertices.Count];
faceMap = new HalfEdgeMesh.Vertex[sourceMesh.Faces.Count];
foreach (var face in sourceMesh.Faces)
{
faceMap[face.Index] = mesh.Vertices.Add(
new VertexTraits(TriMeshUtil.GetMidPoint(face)));
}
foreach (var v in sourceMesh.Vertices)
{
vMap[v.Index] = mesh.Vertices.Add(new VertexTraits(v.Traits.Position));
foreach (var hf in v.HalfEdges)
{
if (hf.Face != null && hf.Opposite.Face != null)
{
mesh.Faces.AddTriangles(faceMap[hf.Face.Index],
vMap[v.Index], faceMap[hf.Opposite.Face.Index]);
}
}
}
foreach (var hf in sourceMesh.HalfEdges)
{
if (hf.Face == null)
{
mesh.Faces.AddTriangles(vMap[hf.ToVertex.Index],
vMap[hf.FromVertex.Index], faceMap[hf.Opposite.Face.Index]);
}
}
return(mesh);
}
public static PolygonMesh BuildDual(TriMesh mesh, EnumDual type)
{
TriMeshModify.RepaireAllHole(mesh);
PolygonMesh.Vertex[] faceMap = new HalfEdgeMesh.Vertex[mesh.Faces.Count];
PolygonMesh.Vertex[] edgeMap = new HalfEdgeMesh.Vertex[mesh.Edges.Count];
PolygonMesh pm = new PolygonMesh();
foreach (var face in mesh.Faces)
{
Vector3D center = Vector3D.Zero;
switch (type)
{
case EnumDual.DualA:
center = TriMeshUtil.GetMidPoint(face);
break;
case EnumDual.DualB:
TriMesh.Vertex vertex0 = face.GetVertex(0);
TriMesh.Vertex vertex1 = face.GetVertex(1);
TriMesh.Vertex vertex2 = face.GetVertex(2);
Triangle triangle = new Triangle(vertex0.Traits.Position,
vertex1.Traits.Position,
vertex2.Traits.Position);
center = triangle.ComputeCircumCenter();
break;
default:
break;
}
PolygonMesh.Vertex v = new HalfEdgeMesh.Vertex(new VertexTraits(center));
faceMap[face.Index] = v;
pm.AppendToVertexList(v);
}
foreach (var edge in mesh.Edges)
{
VertexTraits trait = new VertexTraits(TriMeshUtil.GetMidPoint(edge));
PolygonMesh.Vertex v = new HalfEdgeMesh.Vertex(trait);
edgeMap[edge.Index] = v;
pm.AppendToVertexList(v);
}
foreach (var v in mesh.Vertices)
{
List <PolygonMesh.Vertex> list = new List <HalfEdgeMesh.Vertex>();
foreach (var hf in v.HalfEdges)
{
list.Add(faceMap[hf.Face.Index]);
list.Add(edgeMap[hf.Edge.Index]);
}
list.Reverse();
pm.Faces.Add(list.ToArray());
}
return(pm);
}
public void Subdivision()
{
/* /\ /\
* / \ /__\
* / \ /\ /\
* / \ /__\/__\
* / \ /\ /\ /\
* /__________\ /__\/__\/__\
*
* 为了让每个顶点周围都有它专属的一圈价为6的点，把每个三角形拆成9个
*/
TriMesh copy = TriMeshIO.Clone(this.mesh);
this.mesh.Clear();
TriMesh.Vertex[] faceMap = new HalfEdgeMesh.Vertex[copy.Faces.Count];
TriMesh.Vertex[] hfMap = new HalfEdgeMesh.Vertex[copy.HalfEdges.Count];
foreach (var v in copy.Vertices)
{
this.mesh.Vertices.Add(new VertexTraits(v.Traits.Position));
}
foreach (var face in copy.Faces)
{
faceMap[face.Index] = this.mesh.Vertices.Add(new VertexTraits(TriMeshUtil.GetMidPoint(face)));
}
foreach (var hf in copy.HalfEdges)
{
Vector3D pos = hf.FromVertex.Traits.Position * 2 / 3 + hf.ToVertex.Traits.Position * 1 / 3;
hfMap[hf.Index] = this.mesh.Vertices.Add(new VertexTraits(pos));
}
foreach (var face in copy.Faces)
{
foreach (var hf in face.Halfedges)
{
this.mesh.Faces.AddTriangles(faceMap[face.Index], hfMap[hf.Index], hfMap[hf.Opposite.Index]);
this.mesh.Faces.AddTriangles(faceMap[face.Index], hfMap[hf.Opposite.Index], hfMap[hf.Next.Index]);
}
}
foreach (var v in copy.Vertices)
{
foreach (var hf in v.HalfEdges)
{
if (hf.Face != null)
{
this.mesh.Faces.AddTriangles(this.mesh.Vertices[v.Index], hfMap[hf.Index], hfMap[hf.Previous.Opposite.Index]);
}
}
}
}
static int GetNearest(TriMesh.Face face, Dictionary <int, Cluster> dict)
{
Vector3D center = TriMeshUtil.GetMidPoint(face);
int nearestIndex = -1;
double nearest = double.MaxValue;
foreach (var item in dict)
{
double dist = Vector3D.Distance(center, item.Value.Center);
if (dist < nearest)
{
nearestIndex = item.Key;
nearest = dist;
}
}
return(nearestIndex);
}
public List <TriMesh.Edge> BuildCoTree(DynamicTree <TriMesh.Face> cotree)
{
if (cotree == null)
{
return(null);
}
List <TriMesh.Edge> cotreeMarks = new List <HalfEdgeMesh.Edge>();
Vector3D[] bycenters = new Vector3D[mesh.Faces.Count];
cotreeMarks = new List <HalfEdgeMesh.Edge>();
TreeNode <TriMesh.Face> currentCoNode = cotree.Root;
Queue <TreeNode <TriMesh.Face> > coQueue = new Queue <TreeNode <TriMesh.Face> >();
coQueue.Enqueue(currentCoNode);
do
{
currentCoNode = coQueue.Dequeue();
bycenters[currentCoNode.Attribute.Index] = TriMeshUtil.GetMidPoint(currentCoNode.Attribute);
TreeNode <TriMesh.Face> currentChild = currentCoNode.LeftMostChild;
while (currentChild != null)
{
//Mark edge
TriMesh.Face f1 = currentCoNode.Attribute;
TriMesh.Face f2 = currentChild.Attribute;
foreach (TriMesh.HalfEdge hf in f1.Halfedges)
{
if (hf.Opposite.Face == f2)
{
cotreeMarks.Add(hf.Edge);
break;
}
}
coQueue.Enqueue(currentChild);
currentChild = currentChild.RightSibling;
}
} while (coQueue.Count > 0);
return(cotreeMarks);
}
protected Vector3D GetPos1(TriMesh.HalfEdge hf)
{
Vector3D from = hf.FromVertex.Traits.Position;
Vector3D to = hf.ToVertex.Traits.Position;
Vector3D l = to - from;
Vector3D[] vi = this.GetV(hf);
Vector3D[] vj = this.GetV(hf.Opposite);
Vector3D c1 = Vector3D.Zero;
Vector3D c2 = Vector3D.Zero;
for (int i = 0; i < vi.Length - 1; i++)
{
c1 += (vi[i] - from).Cross(vi[i + 1] - from);
}
for (int i = 0; i < vj.Length - 1; i++)
{
c2 += (vj[i + 1] - to).Cross(vj[i] - to);
}
Matrix4D m = Matrix4D.ZeroMatrix;
m.Row1 = new Vector4D(c1 - c2, to.Dot(c2) - from.Dot(c1));
m.Row2 = new Vector4D(l.y, -l.x, 0d, to.y * l.x - to.x * l.y);
m.Row3 = new Vector4D(l.z, 0d, -l.x, to.z * l.x - to.x * l.z);
m.Row4 = new Vector4D(0d, 0d, 0d, 1d);
Vector3D pos = Vector3D.Zero;
double det = Util.Solve(ref m, ref pos);
if (det == 0)
{
pos = TriMeshUtil.GetMidPoint(hf.Edge);
}
else
{
double vo1 = c1.Dot(pos - from);
double vo2 = c2.Dot(pos - to);
}
return(pos);
}
public void DrawTreeCotree(List <TriMesh.Edge> treeMarks, List <TriMesh.Edge> cotreeMarks)
{
OpenGLManager.Instance.SetColor(System.Drawing.Color.Green);
//Draw Tree
foreach (TriMesh.Edge item in treeMarks)
{
GL.Begin(BeginMode.Lines);
Vector3D a = item.Vertex0.Traits.Position;
Vector3D b = item.Vertex1.Traits.Position;
GL.Vertex3(a.x, a.y, a.z);
GL.Vertex3(b.x, b.y, b.z);
GL.End();
}
OpenGLManager.Instance.SetColor(System.Drawing.Color.Red);
//Draw CoTree
foreach (TriMesh.Edge item in cotreeMarks)
{
Vector3D a = TriMeshUtil.GetMidPoint(item.Face0);
Vector3D b = TriMeshUtil.GetMidPoint(item.Face1);
Vector3D centerOfEdge = (item.Vertex0.Traits.Position + item.Vertex1.Traits.Position) / 2;
GL.Begin(BeginMode.Lines);
GL.Vertex3(a.x, a.y, a.z);
GL.Vertex3(centerOfEdge.x, centerOfEdge.y, centerOfEdge.z);
GL.End();
GL.Begin(BeginMode.Lines);
GL.Vertex3(centerOfEdge.x, centerOfEdge.y, centerOfEdge.z);
GL.Vertex3(b.x, b.y, b.z);
GL.End();
}
}
private ErrorPair GetErrorPair(TriMesh.Face face)
{
Matrix4D m1 = this.GetVolumeMatrix(face);
if (m1[1] != m1[4] || m1[2] != m1[8] || m1[6] != m1[9] ||
m1[3] != m1[12] || m1[7] != m1[13] || m1[11] != m1[14]
)
{
throw new Exception("Matrix m1 is not symmetric");
}
Matrix4D m2 = Matrix4D.ZeroMatrix;
for (int i = 0; i <= 11; i++)
{
m2[i] = m1[i];
}
m2[12] = 0;
m2[13] = 0;
m2[14] = 0;
m2[15] = 1;
Vector3D newPos = Vector3D.Zero;
double det = Util.Solve(ref m2, ref newPos);
if (det == 0)
{
newPos = TriMeshUtil.GetMidPoint(face);
}
double error = this.GetError(m1, newPos);
return(new ErrorPair()
{
Pos = newPos, Error = error
});
}
public static EdgeContext Merge(TriMesh.Edge edge)
{
Vector3D position = TriMeshUtil.GetMidPoint(edge);
return(Merge(edge, position));
}
protected virtual Vector3D GetPos(TriMesh.Face target)
{
return(TriMeshUtil.GetMidPoint(target));
}
protected override Vector3D GetPos(TriMesh.Face target)
{
return(TriMeshUtil.GetMidPoint(target));
//return this.faceError[target.Index].Pos;
}
protected Vector3D GetPos(TriMesh.HalfEdge hf)
{
return(TriMeshUtil.GetMidPoint(hf.Edge));
}
public void DrawGenerators(TriMesh mesh, List <List <TriMesh.HalfEdge> > Generators)
{
if (Generators == null)
{
return;
}
Vector3D[] bycenters = new Vector3D[mesh.Faces.Count];
foreach (TriMesh.Face face in mesh.Faces)
{
bycenters[face.Index] = TriMeshUtil.GetMidPoint(face);
}
bool[] edgeFlags = new bool[mesh.Edges.Count];
int i = 0;
System.Drawing.Color color = System.Drawing.Color.Orange;
foreach (List <TriMesh.HalfEdge> loop in Generators)
{
switch (i)
{
case 1:
color = System.Drawing.Color.Green;
break;
case 2:
color = System.Drawing.Color.Red;
break;
case 3:
color = System.Drawing.Color.Purple;
break;
default:
color = System.Drawing.Color.Orange;
break;
}
OpenGLManager.Instance.SetColor(color);
foreach (TriMesh.HalfEdge loopItem in loop)
{
TriMesh.Edge edge = loopItem.Edge;
if (edgeFlags[edge.Index] == false)
{
Vector3D a = bycenters[edge.Face0.Index];
Vector3D b = bycenters[edge.Face1.Index];
Vector3D centerOfEdge = (edge.Vertex0.Traits.Position + edge.Vertex1.Traits.Position) / 2;
GL.Begin(BeginMode.Lines);
GL.Vertex3(a.x, a.y, a.z);
GL.Vertex3(centerOfEdge.x, centerOfEdge.y, centerOfEdge.z);
GL.End();
GL.Begin(BeginMode.Lines);
GL.Vertex3(centerOfEdge.x, centerOfEdge.y, centerOfEdge.z);
GL.Vertex3(b.x, b.y, b.z);
GL.End();
}
edgeFlags[edge.Index] = true;
}
i++;
}
}
private TriMesh ChangeTopologyLoopSelected(TriMesh sourceMesh)
{
TriMesh newMesh = new TriMesh();
newMesh.Clear();
vMap = new HalfEdgeMesh.Vertex[sourceMesh.Vertices.Count];
eMap = new HalfEdgeMesh.Vertex[Mesh.Edges.Count];
foreach (var v in sourceMesh.Vertices)
{
vMap[v.Index] = newMesh.Vertices.Add(new VertexTraits(v.Traits.Position));
}
foreach (var edge in sourceMesh.Edges)
{
if (edge.Vertex0.Traits.SelectedFlag != 0 && edge.Vertex1.Traits.SelectedFlag != 0)
{
eMap[edge.Index] = newMesh.Vertices.Add(new VertexTraits(TriMeshUtil.GetMidPoint(edge)));
}
}
foreach (TriMesh.Face face in sourceMesh.Faces)
{
List <TriMesh.HalfEdge> list = new List <HalfEdgeMesh.HalfEdge>();
foreach (var hf in face.Halfedges)
{
if (hf.ToVertex.Traits.SelectedFlag != 0 && hf.FromVertex.Traits.SelectedFlag != 0)
{
list.Add(hf);
}
}
switch (list.Count)
{
case 0:
newMesh.Faces.AddTriangles(
vMap[face.GetVertex(0).Index],
vMap[face.GetVertex(1).Index],
vMap[face.GetVertex(2).Index]);
break;
case 1:
TriMesh.HalfEdge h = list[0];
newMesh.Faces.AddTriangles(
eMap[h.Edge.Index],
vMap[h.ToVertex.Index],
vMap[h.Next.ToVertex.Index]);
newMesh.Faces.AddTriangles(
eMap[h.Edge.Index],
vMap[h.Next.ToVertex.Index],
vMap[h.FromVertex.Index]);
break;
case 3:
foreach (var hf in face.Halfedges)
{
newMesh.Faces.AddTriangles(eMap[hf.Edge.Index], vMap[hf.ToVertex.Index], eMap[hf.Next.Edge.Index]);
}
newMesh.Faces.AddTriangles(
eMap[face.HalfEdge.Previous.Edge.Index],
eMap[face.HalfEdge.Edge.Index],
eMap[face.HalfEdge.Next.Edge.Index]);
break;
default:
break;
}
}
return(newMesh);
}
public static TriMesh.Vertex MergeTriangle(TriMesh.Face face)
{
Vector3D pos = TriMeshUtil.GetMidPoint(face);
return(MergeTriangle(face, pos));
}
