void append_mapped_triangles(STLSolid solid, DMesh3Builder builder, int[] mapV)
{
int nTris = solid.Vertices.Count / 3;
for (int ti = 0; ti < nTris; ++ti)
{
int a = mapV[3 * ti];
int b = mapV[3 * ti + 1];
int c = mapV[3 * ti + 2];
if (a == b || a == c || b == c) // don't try to add degenerate triangles
{
continue;
}
builder.AppendTriangle(a, b, c);
}
}
