public virtual bool Fill(int group_id = -1)
{
if (Loop.Vertices.Length < 3)
{
return(false);
}
// this just needs one triangle
if (Loop.Vertices.Length == 3)
{
Index3i tri = new Index3i(Loop.Vertices[0], Loop.Vertices[2], Loop.Vertices[1]);
int new_tid = Mesh.AppendTriangle(tri, group_id);
if (new_tid < 0)
{
return(false);
}
NewTriangles = new int[1] {
new_tid
};
NewVertex = DMesh3.InvalidID;
return(true);
}
// [TODO] 4-case? could check nbr normals to figure out best internal edge...
// compute centroid
Vector3d c = Vector3d.Zero;
for (int i = 0; i < Loop.Vertices.Length; ++i)
{
c += Mesh.GetVertex(Loop.Vertices[i]);
}
c *= 1.0 / Loop.Vertices.Length;
// add centroid vtx
NewVertex = Mesh.AppendVertex(c);
// stitch triangles
MeshEditor editor = new MeshEditor(Mesh);
try {
NewTriangles = editor.AddTriangleFan_OrderedVertexLoop(NewVertex, Loop.Vertices, group_id);
} catch {
NewTriangles = null;
}
// if fill failed, back out vertex-add
if (NewTriangles == null)
{
Mesh.RemoveVertex(NewVertex, true, false);
NewVertex = DMesh3.InvalidID;
return(false);
}
else
{
return(true);
}
}
