// Assumption here is that Submesh has been modified, but boundary loop has
// been preserved, and that old submesh has already been removed from this mesh.
// So, we just have to append new vertices and then rewrite triangles
// If new_tris or new_verts is non-null, we will return this info.
// new_tris should be set to TriangleCount (ie it is not necessarily a map)
// For new_verts, if we used an existing bdry vtx instead, we set the value to -(existing_index+1),
// otherwise the value is new_index (+1 is to handle 0)
//
// Returns true if submesh successfully inserted, false if any triangles failed
// (which happens if triangle would result in non-manifold mesh)
public bool ReinsertSubmesh(DSubmesh3 sub, ref int[] new_tris, out IndexMap SubToNewV)
{
if (sub.BaseBorderV == null)
{
throw new Exception("MeshEditor.ReinsertSubmesh: Submesh does not have required boundary info. Call ComputeBoundaryInfo()!");
}
DMesh3 submesh = sub.SubMesh;
bool bAllOK = true;
IndexFlagSet done_v = new IndexFlagSet(submesh.MaxVertexID, submesh.TriangleCount / 2);
SubToNewV = new IndexMap(submesh.MaxVertexID, submesh.VertexCount);
int nti = 0;
int NT = submesh.MaxTriangleID;
for (int ti = 0; ti < NT; ++ti)
{
if (submesh.IsTriangle(ti) == false)
{
continue;
}
Index3i sub_t = submesh.GetTriangle(ti);
int gid = submesh.GetTriangleGroup(ti);
Index3i new_t = Index3i.Zero;
for (int j = 0; j < 3; ++j)
{
int sub_v = sub_t[j];
int new_v = -1;
if (done_v[sub_v] == false)
{
// first check if this is a boundary vtx on submesh and maps to a bdry vtx on base mesh
if (submesh.vertex_is_boundary(sub_v))
{
int base_v = (sub_v < sub.SubToBaseV.size) ? sub.SubToBaseV[sub_v] : -1;
if (base_v >= 0 && Mesh.IsVertex(base_v) && sub.BaseBorderV[base_v] == true)
{
// [RMS] this should always be true, but assert in tests to find out
Debug.Assert(Mesh.vertex_is_boundary(base_v));
if (Mesh.vertex_is_boundary(base_v))
{
new_v = base_v;
}
}
}
// if that didn't happen, append new vtx
if (new_v == -1)
{
new_v = Mesh.AppendVertex(submesh, sub_v);
}
SubToNewV[sub_v] = new_v;
done_v[sub_v] = true;
}
else
{
new_v = SubToNewV[sub_v];
}
new_t[j] = new_v;
}
Debug.Assert(Mesh.FindTriangle(new_t.a, new_t.b, new_t.c) == DMesh3.InvalidID);
int new_tid = Mesh.AppendTriangle(new_t, gid);
Debug.Assert(new_tid != DMesh3.InvalidID && new_tid != DMesh3.NonManifoldID);
if (!Mesh.IsTriangle(new_tid))
{
bAllOK = false;
}
if (new_tris != null)
{
new_tris[nti++] = new_tid;
}
}
return(bAllOK);
}