public bool Insert()
{
Func <int, bool> is_contained_v = (vid) => {
Vector3d v = Mesh.GetVertex(vid);
Vector2f vf2 = ProjectFrame.ToPlaneUV((Vector3f)v, 2);
return(Polygon.Contains(vf2));
};
MeshVertexSelection vertexROI = new MeshVertexSelection(Mesh);
Index3i seedT = Mesh.GetTriangle(SeedTriangle);
// if a seed vert of seed triangle is containd in polygon, we will
// flood-fill out from there, this gives a better ROI.
// If not, we will try flood-fill from the seed triangles.
List <int> seed_verts = new List <int>();
for (int j = 0; j < 3; ++j)
{
if (is_contained_v(seedT[j]))
{
seed_verts.Add(seedT[j]);
}
}
if (seed_verts.Count == 0)
{
seed_verts.Add(seedT.a);
seed_verts.Add(seedT.b);
seed_verts.Add(seedT.c);
}
// flood-fill out from seed vertices until we have found all vertices
// contained in polygon
vertexROI.FloodFill(seed_verts.ToArray(), is_contained_v);
// convert vertex ROI to face ROI
MeshFaceSelection faceROI = new MeshFaceSelection(Mesh, vertexROI, 1);
faceROI.ExpandToOneRingNeighbours();
faceROI.FillEars(true); // this might be a good idea...
// construct submesh
RegionOperator regionOp = new RegionOperator(Mesh, faceROI);
DSubmesh3 roiSubmesh = regionOp.Region;
DMesh3 roiMesh = roiSubmesh.SubMesh;
// save 3D positions of unmodified mesh
Vector3d[] initialPositions = new Vector3d[roiMesh.MaxVertexID];
// map roi mesh to plane
MeshTransforms.PerVertexTransform(roiMesh, roiMesh.VertexIndices(), (v, vid) => {
Vector2f uv = ProjectFrame.ToPlaneUV((Vector3f)v, 2);
initialPositions[vid] = v;
return(new Vector3d(uv.x, uv.y, 0));
});
// save a copy of 2D mesh and construct bvtree. we will use
// this later to project back to 3d
// [TODO] can we use a better spatial DS here, that takes advantage of 2D?
DMesh3 projectMesh = new DMesh3(roiMesh);
DMeshAABBTree3 projecter = new DMeshAABBTree3(projectMesh, true);
MeshInsertUVPolyCurve insertUV = new MeshInsertUVPolyCurve(roiMesh, Polygon);
//insertUV.Validate()
bool bOK = insertUV.Apply();
if (!bOK)
{
throw new Exception("insertUV.Apply() failed");
}
if (SimplifyInsertion)
{
insertUV.Simplify();
}
int[] insertedPolyVerts = insertUV.CurveVertices;
// grab inserted loop, assuming it worked
EdgeLoop insertedLoop = null;
if (insertUV.Loops.Count == 1)
{
insertedLoop = insertUV.Loops[0];
}
// find interior triangles
List <int> interiorT = new List <int>();
foreach (int tid in roiMesh.TriangleIndices())
{
Vector3d centroid = roiMesh.GetTriCentroid(tid);
if (Polygon.Contains(centroid.xy))
{
interiorT.Add(tid);
}
}
if (RemovePolygonInterior)
{
MeshEditor editor = new MeshEditor(roiMesh);
editor.RemoveTriangles(interiorT, true);
InteriorTriangles = null;
}
else
{
InteriorTriangles = interiorT.ToArray();
}
// map back to 3d
Vector3d a = Vector3d.Zero, b = Vector3d.Zero, c = Vector3d.Zero;
foreach (int vid in roiMesh.VertexIndices())
{
// [TODO] somehow re-use exact positions from regionOp maps?
// construct new 3D pos w/ barycentric interpolation
Vector3d v = roiMesh.GetVertex(vid);
int tid = projecter.FindNearestTriangle(v);
Index3i tri = projectMesh.GetTriangle(tid);
projectMesh.GetTriVertices(tid, ref a, ref b, ref c);
Vector3d bary = MathUtil.BarycentricCoords(ref v, ref a, ref b, ref c);
Vector3d pos = bary.x * initialPositions[tri.a] + bary.y * initialPositions[tri.b] + bary.z * initialPositions[tri.c];
roiMesh.SetVertex(vid, pos);
}
bOK = BackPropagate(regionOp, insertedPolyVerts, insertedLoop);
return(bOK);
}
