public virtual bool Extrude(int group_id = -1)
{
// duplicate loop vertices
int NV = Loop.Vertices.Length;
NewLoop = new EdgeLoop(Mesh);
NewLoop.Vertices = new int[NV];
for (int i = 0; i < NV; ++i)
{
int vid = Loop.Vertices[i];
NewLoop.Vertices[i] = Mesh.AppendVertex(Mesh, vid);
}
// move to offset positions
for (int i = 0; i < NV; ++i)
{
Vector3D v = Mesh.GetVertex(Loop.Vertices[i]);
Vector3F n = Mesh.GetVertexNormal(Loop.Vertices[i]);
Vector3D new_v = PositionF(v, n, i);
Mesh.SetVertex(NewLoop.Vertices[i], new_v);
}
// stitch interior
MeshEditor edit = new MeshEditor(Mesh);
NewTriangles = edit.StitchLoop(Loop.Vertices, NewLoop.Vertices, group_id);
return(true);
}