public static PlanktonMesh Ambo(this PlanktonMesh pMesh)
{
// create new Plankton mesh, to hold ambo vertices and faces
PlanktonMesh apMesh = new PlanktonMesh();
// iterate over all half-edges of original mesh
for (int i = 0; i < pMesh.Halfedges.Count; i++)
{
// test if already used half-edge
if (pMesh.Halfedges[i].StartVertex > pMesh.Halfedges.EndVertex(i))
{
continue;
}
// get mid-point of current half-edge
var c = pMesh.PointAtEdge(i, 0.5);
// add it to new mesh
apMesh.Vertices.Add(c.X, c.Y, c.Z);
}
// iterate over all faces of original mesh
// to create faces corresponding to them
for (int i = 0; i < pMesh.Faces.Count; i++)
{
// get half-edge indices corresponding to current face
var heIndices = pMesh.Faces.GetHalfedges(i);
// each half-edge index in the original mesh directly corresponds to a vertex index in the new mesh
// so we can assign a new face by the found half-edge indices (divided by two)
apMesh.Faces.AddFace(from index in heIndices select index / 2);
}
// iterate over all vertices of original mesh
// to create faces corresponding to their connectivity
for (int i = 0; i < pMesh.Vertices.Count; i++)
{
// get half-edge indices corresponding to current vertex
var heIndices = pMesh.Vertices.GetHalfedges(i);
// we can use the same knowledge about connectivity like with the faces
apMesh.Faces.AddFace(from index in heIndices.Reverse() select index / 2);
}
return(apMesh);
}
