// assumes PathT contains set of triangles
// that are fully connected, ie a flood-fill cannot escape!
void find_interior_from_seed(int tSeed)
{
MeshFaceSelection selection = new MeshFaceSelection(Mesh);
selection.Select(PathT);
selection.FloodFill(tSeed);
InteriorT = new List <int>(selection);
}
public bool Insert()
{
OuterInsert = new MeshInsertUVPolyCurve(Mesh, Polygon.Outer);
Util.gDevAssert(OuterInsert.Validate() == ValidationStatus.Ok);
bool outerApplyOK = OuterInsert.Apply();
if (outerApplyOK == false || OuterInsert.Loops.Count == 0)
{
return(false);
}
if (SimplifyInsertion)
{
OuterInsert.Simplify();
}
HoleInserts = new List <MeshInsertUVPolyCurve>(Polygon.Holes.Count);
for (int hi = 0; hi < Polygon.Holes.Count; ++hi)
{
var insert = new MeshInsertUVPolyCurve(Mesh, Polygon.Holes[hi]);
Util.gDevAssert(insert.Validate() == ValidationStatus.Ok);
insert.Apply();
if (SimplifyInsertion)
{
insert.Simplify();
}
HoleInserts.Add(insert);
}
// find a triangle connected to loop that is inside the polygon
// [TODO] maybe we could be a bit more robust about this? at least
// check if triangle is too degenerate...
int seed_tri = -1;
EdgeLoop outer_loop = OuterInsert.Loops[0];
for (int i = 0; i < outer_loop.EdgeCount; ++i)
{
if (!Mesh.IsEdge(outer_loop.Edges[i]))
{
continue;
}
Index2i et = Mesh.GetEdgeT(outer_loop.Edges[i]);
Vector3d ca = Mesh.GetTriCentroid(et.a);
bool in_a = Polygon.Outer.Contains(ca.xy);
Vector3d cb = Mesh.GetTriCentroid(et.b);
bool in_b = Polygon.Outer.Contains(cb.xy);
if (in_a && in_b == false)
{
seed_tri = et.a;
break;
}
else if (in_b && in_a == false)
{
seed_tri = et.b;
break;
}
}
if (seed_tri == -1)
{
throw new Exception("MeshPolygonsInserter: could not find seed triangle!");
}
// make list of all outer & hole edges
InsertedPolygonEdges = new HashSet <int>(outer_loop.Edges);
foreach (var insertion in HoleInserts)
{
foreach (int eid in insertion.Loops[0].Edges)
{
InsertedPolygonEdges.Add(eid);
}
}
// flood-fill inside loop from seed triangle
InteriorTriangles = new MeshFaceSelection(Mesh);
InteriorTriangles.FloodFill(seed_tri, null, (eid) => { return(InsertedPolygonEdges.Contains(eid) == false); });
return(true);
}