/// TODO: make the smooth generic with the subdivision type
/// <summary>
/// Smooth the vertex with loop subdivision
/// </summary>
/// <param name="m">Polymesh</param>
/// <param name="vh">Vertex Handle to smooth</param>
/// <param name="p">new position for the vertex</param>
/// <returns>false indicates that the vertex is not in the Polymesh which can be removed</returns>
public static bool Smooth(PolyMesh m, int vh, out Vector3 p)
{
p = Vector3.zero;
if (m.IsBoundaryVertex(vh))
{
int heh = m.GetHalfedgeVertexH(vh), prev_heh;
if (heh.isValidHandle())
{
//Debug.Assert(m.IsBoundaryEdge(m.GetEdgeH(heh)));
prev_heh = m.GetPrevHalfedgeH(heh);
int to_vh = m.GetEndVertexH(heh),
from_vh = m.GetStartVertexH(prev_heh);
p = m.GetPoint(vh);
p *= 6.0f;
p += m.GetPoint(to_vh);
p += m.GetPoint(from_vh);
p *= 0.125f;
}
else
{
return(false);
}
}
else
{
var vit = m.GetVertexVertexIter(vh);
int valence = 0;
foreach (var vvh in vit)
{
valence++;
p += m.GetPoint(vvh);
}
var w = SmoothUtils.loopWeights[valence];
p *= w.second;
p += m.GetPoint(vh) * w.first;
}
return(true);
}