public void Split(EdgeContext ctx)
{
TriMesh.HalfEdge[] hfs = this.FindGroup(ctx.Left, ctx.Top, ctx.Buttom);
TriMesh mesh = (TriMesh)ctx.Left.Mesh;
ctx.Left.Traits.Position = ctx.LeftPos;
ctx.Left.HalfEdge = hfs[0];
ctx.Right.HalfEdge = hfs[1];
mesh.Add(ctx.Right);
for (int i = 0; i < hfs.Length - 1; i++)
{
hfs[i].Opposite.ToVertex = ctx.Right;
}
TriMesh.HalfEdge[] triangle1 = this.AddInnerTriangle(mesh, ctx.AboveFace, ctx.Left, ctx.Right, ctx.Top);
this.InsertEdge(mesh, ctx.TopLeftEdge, triangle1[1], hfs[0]);
TriMesh.HalfEdge[] triangle2 = this.AddInnerTriangle(mesh, ctx.UnderFace, ctx.Right, ctx.Left, ctx.Buttom);
this.InsertEdge(mesh, ctx.ButtomRightEdge, triangle2[1], hfs[hfs.Length - 1]);
ctx.MidEdge.HalfEdge0 = triangle2[0];
triangle1[0].Edge = ctx.MidEdge;
triangle2[0].Edge = ctx.MidEdge;
triangle1[0].Opposite = triangle2[0];
triangle2[0].Opposite = triangle1[0];
mesh.Add(ctx.MidEdge);
}
private TriMesh.HalfEdge[] AddInnerTriangle(TriMesh mesh, TriMesh.Face face, params TriMesh.Vertex[] verteces)
{
mesh.Add(face);
TriMesh.HalfEdge[] hfs = new TriMesh.HalfEdge[3];
for (int i = 0; i < hfs.Length; i++)
{
hfs[i] = new TriMesh.HalfEdge();
hfs[i].ToVertex = verteces[(i + 1) % hfs.Length];
hfs[i].Face = face;
mesh.AppendToHalfedgeList(hfs[i]);
}
face.HalfEdge = hfs[0];
this.ConnectHalfEdge(hfs);
return hfs;
}
private TriMesh.HalfEdge[] AddInnerTriangle(TriMesh mesh, TriMesh.Face face, params TriMesh.Vertex[] verteces)
{
mesh.Add(face);
TriMesh.HalfEdge[] hfs = new TriMesh.HalfEdge[3];
for (int i = 0; i < hfs.Length; i++)
{
hfs[i] = new TriMesh.HalfEdge();
hfs[i].ToVertex = verteces[(i + 1) % hfs.Length];
hfs[i].Face = face;
mesh.AppendToHalfedgeList(hfs[i]);
}
face.HalfEdge = hfs[0];
this.ConnectHalfEdge(hfs);
return(hfs);
}
private void InsertEdge(TriMesh mesh, TriMesh.Edge edge, TriMesh.HalfEdge inner, TriMesh.HalfEdge outer)
{
TriMesh.Edge left = edge;
left.HalfEdge0 = outer;
outer.Edge = left;
inner.Next.Edge = left;
TriMesh.Edge right = outer.Edge;
right.HalfEdge0 = inner;
inner.Edge = right;
outer.Opposite.Edge = right;
inner.Opposite = outer.Opposite;
inner.Next.Opposite = outer;
outer.Opposite.Opposite = inner;
outer.Opposite = inner.Next;
mesh.Add(edge);
}
private void InsertEdge(TriMesh mesh, TriMesh.Edge edge, TriMesh.HalfEdge inner, TriMesh.HalfEdge outer)
{
TriMesh.Edge left = edge;
left.HalfEdge0 = outer;
outer.Edge = left;
inner.Next.Edge = left;
TriMesh.Edge right = outer.Edge;
right.HalfEdge0 = inner;
inner.Edge = right;
outer.Opposite.Edge = right;
inner.Opposite = outer.Opposite;
inner.Next.Opposite = outer;
outer.Opposite.Opposite = inner;
outer.Opposite = inner.Next;
mesh.Add(edge);
}
