/// <summary>
/// Remove all bowtie vertices in mesh. Makes one pass unless
/// bRepeatUntilClean = true, in which case repeats until no more bowties found
/// Returns true if any vertices were removed
/// </summary>
public bool RemoveAllBowtieVertices(bool bRepeatUntilClean)
{
int nRemoved = 0;
while (true)
{
List <int> bowties = new List <int>();
foreach (int vID in Mesh.VertexIndices())
{
if (Mesh.IsBowtieVertex(vID))
{
bowties.Add(vID);
}
}
if (bowties.Count == 0)
{
break;
}
foreach (int vID in bowties)
{
MeshResult result = Mesh.RemoveVertex(vID, true, false);
Debug.Assert(result == MeshResult.Ok);
nRemoved++;
}
if (bRepeatUntilClean == false)
{
break;
}
}
return(nRemoved > 0);
}
public static IEnumerable <int> BowtieVertices(DMesh3 mesh)
{
int N = mesh.MaxVertexID;
for (int i = 0; i < N; ++i)
{
if (mesh.IsVertex(i))
{
if (mesh.IsBowtieVertex(i))
{
yield return(i);
}
}
}
}
public static GenusResult Genus(DMesh3 mesh)
{
GenusResult result = new GenusResult()
{
Valid = false, Genus = -1
};
if (!mesh.CachedIsClosed)
{
result.HasBoundary = true;
return(result);
}
MeshConnectedComponents compT = new MeshConnectedComponents(mesh);
compT.FindConnectedT();
if (compT.Count > 1)
{
result.MultipleConnectedComponents = true;
return(result);
}
int isolated_verts = 0;
foreach (int vid in mesh.VertexIndices())
{
if (mesh.IsBowtieVertex(vid))
{
result.HasBowtieVertices = true;
return(result);
}
if (mesh.GetVtxTriangleCount(vid) == 0)
{
isolated_verts++;
}
}
int V = mesh.VertexCount - isolated_verts;
int F = mesh.TriangleCount;
int E = mesh.EdgeCount;
result.Genus = (2 - (V + F - E)) / 2;
result.Valid = true;
return(result);
}