public MeshRegionBoundaryLoops(DMesh3 mesh, int[] RegionTris, bool bAutoCompute = true)
{
this.Mesh = mesh;
// make flag set for included triangles
triangles = new IndexFlagSet(mesh.MaxTriangleID, RegionTris.Length);
for (int i = 0; i < RegionTris.Length; ++i)
{
triangles[RegionTris[i]] = true;
}
// make flag set for included edges
// NOTE: this currently processes non-boundary-edges twice. Could
// avoid w/ another IndexFlagSet, but the check is inexpensive...
edges = new IndexFlagSet(mesh.MaxEdgeID, RegionTris.Length);
for (int i = 0; i < RegionTris.Length; ++i)
{
int tid = RegionTris[i];
Index3i te = Mesh.GetTriEdges(tid);
for (int j = 0; j < 3; ++j)
{
int eid = te[j];
if (!edges.Contains(eid))
{
Index2i et = mesh.GetEdgeT(eid);
if (et.b == DMesh3.InvalidID || triangles[et.a] != triangles[et.b])
{
edges.Add(eid);
}
}
}
}
if (bAutoCompute)
{
Compute();
}
}
bool edge_is_boundary(int eid)
{
return(edges.Contains(eid));
}
