// This function does local remeshing around a boundary loop within a fixed # of
// rings, to try to 'massage' it into a cleaner shape/topology
// [TODO] use geodesic distance instead of fixed # of rings?
public static void cleanup_boundary(NGonsCore.geometry3Sharp.mesh.DMesh3 mesh, EdgeLoop loop, double target_edge_len, int nRings = 3)
{
Debug.Assert(loop.IsBoundaryLoop());
MeshFaceSelection roi = new MeshFaceSelection(mesh);
roi.SelectVertexOneRings(loop.Vertices);
for (int i = 0; i < nRings; ++i)
{
roi.ExpandToOneRingNeighbours();
}
roi.LocalOptimize(true, true);
RegionRemesher r = new RegionRemesher(mesh, roi.ToArray());
r.Precompute();
r.EnableFlips = r.EnableSplits = r.EnableCollapses = true;
r.MinEdgeLength = target_edge_len;
r.MaxEdgeLength = 2 * target_edge_len;
r.EnableSmoothing = true;
r.SmoothSpeedT = 0.1f;
for (int k = 0; k < nRings * 3; ++k)
{
r.BasicRemeshPass();
}
Debug.Assert(mesh.CheckValidity());
r.BackPropropagate();
}
public DMesh3 remesh_region(int iterations, DMesh3 mesh, double min, double max, double angle)
{
int[] tris = GetTrisOnPositiveSide(mesh, new Frame3f(Vector3F.Zero, Vector3F.AxisY));
RegionRemesher r = new RegionRemesher(mesh, tris);
r.Region.SubMesh.CheckValidity(true);
r.Precompute();
r.EnableFlips = r.EnableSplits = r.EnableCollapses = true;
r.MinEdgeLength = min;
r.MaxEdgeLength = max;
r.EnableSmoothing = true;
r.SmoothSpeedT = 1.0f;
for (int k = 0; k < iterations; ++k)
{
r.BasicRemeshPass();
mesh.CheckValidity();
}
r.BackPropropagate();
for (int k = 0; k < iterations; ++k)
{
r.BasicRemeshPass();
mesh.CheckValidity();
}
r.BackPropropagate();
return(mesh);
}
public static void test_remesh_region()
{
int Slices = 16;
DMesh3 mesh = TestUtil.MakeCappedCylinder(false, Slices);
MeshUtil.ScaleMesh(mesh, Frame3f.Identity, new Vector3f(1, 2, 1));
mesh.CheckValidity();
int[] tris = TestUtil.GetTrisOnPositiveSide(mesh, new Frame3f(Vector3f.Zero, Vector3f.AxisY));
RegionRemesher r = new RegionRemesher(mesh, tris);
r.Region.SubMesh.CheckValidity(true);
TestUtil.WriteTestOutputMesh(r.Region.SubMesh, "remesh_region_submesh.obj");
r.Precompute();
double fResScale = 0.5f;
r.EnableFlips = r.EnableSplits = r.EnableCollapses = true;
r.MinEdgeLength = 0.1f * fResScale;
r.MaxEdgeLength = 0.2f * fResScale;
r.EnableSmoothing = true;
r.SmoothSpeedT = 1.0f;
for (int k = 0; k < 5; ++k)
{
r.BasicRemeshPass();
mesh.CheckValidity();
}
TestUtil.WriteTestOutputMesh(r.Region.SubMesh, "remesh_region_submesh_refined.obj");
r.BackPropropagate();
TestUtil.WriteTestOutputMesh(mesh, "remesh_region_submesh_merged_1.obj");
for (int k = 0; k < 5; ++k)
{
r.BasicRemeshPass();
mesh.CheckValidity();
}
r.BackPropropagate();
TestUtil.WriteTestOutputMesh(mesh, "remesh_region_submesh_merged_2.obj");
}
public void Close_Flat()
{
double minlen, maxlen, avglen;
MeshQueries.EdgeLengthStats(Mesh, out minlen, out maxlen, out avglen, 1000);
double target_edge_len = (TargetEdgeLen <= 0) ? avglen : TargetEdgeLen;
// massage around boundary loop
cleanup_boundary(Mesh, InitialBorderLoop, avglen, 3);
// find new border loop
// [TODO] this just assumes there is only one!!
MeshBoundaryLoops loops = new MeshBoundaryLoops(Mesh);
EdgeLoop fill_loop = loops.Loops[0];
int extrude_group = (ExtrudeGroup == -1) ? Mesh.AllocateTriangleGroup() : ExtrudeGroup;
int fill_group = (FillGroup == -1) ? Mesh.AllocateTriangleGroup() : FillGroup;
// decide on projection plane
//AxisAlignedBox3d loopbox = fill_loop.GetBounds();
//Vector3d topPt = loopbox.Center;
//if ( bIsUpper ) {
// topPt.y = loopbox.Max.y + 0.25 * dims.y;
//} else {
// topPt.y = loopbox.Min.y - 0.25 * dims.y;
//}
//Frame3f plane = new Frame3f((Vector3f)topPt);
// extrude loop to this plane
MeshExtrusion extrude = new MeshExtrusion(Mesh, fill_loop);
extrude.PositionF = (v, n, i) => {
return(FlatClosePlane.ProjectToPlane((Vector3F)v, 1));
};
extrude.Extrude(extrude_group);
MeshValidation.IsBoundaryLoop(Mesh, extrude.NewLoop);
Debug.Assert(Mesh.CheckValidity());
// smooth the extrude loop
MeshLoopSmooth loop_smooth = new MeshLoopSmooth(Mesh, extrude.NewLoop);
loop_smooth.ProjectF = (v, i) => {
return(FlatClosePlane.ProjectToPlane((Vector3F)v, 1));
};
loop_smooth.Alpha = 0.5f;
loop_smooth.Rounds = 100;
loop_smooth.Smooth();
Debug.Assert(Mesh.CheckValidity());
// fill result
SimpleHoleFiller filler = new SimpleHoleFiller(Mesh, extrude.NewLoop);
filler.Fill(fill_group);
Debug.Assert(Mesh.CheckValidity());
// make selection for remesh region
MeshFaceSelection remesh_roi = new MeshFaceSelection(Mesh);
remesh_roi.Select(extrude.NewTriangles);
remesh_roi.Select(filler.NewTriangles);
remesh_roi.ExpandToOneRingNeighbours();
remesh_roi.ExpandToOneRingNeighbours();
remesh_roi.LocalOptimize(true, true);
int[] new_roi = remesh_roi.ToArray();
// get rid of extrude group
FaceGroupUtil.SetGroupToGroup(Mesh, extrude_group, 0);
/* clean up via remesh
* - constrain loop we filled to itself
*/
RegionRemesher r = new RegionRemesher(Mesh, new_roi);
DCurve3 top_curve = mesh.MeshUtil.ExtractLoopV(Mesh, extrude.NewLoop.Vertices);
DCurveProjectionTarget curve_target = new DCurveProjectionTarget(top_curve);
int[] top_loop = (int[])extrude.NewLoop.Vertices.Clone();
r.Region.MapVerticesToSubmesh(top_loop);
MeshConstraintUtil.ConstrainVtxLoopTo(r.Constraints, r.Mesh, top_loop, curve_target);
DMeshAABBTree3 spatial = new DMeshAABBTree3(Mesh);
spatial.Build();
MeshProjectionTarget target = new MeshProjectionTarget(Mesh, spatial);
r.SetProjectionTarget(target);
bool bRemesh = true;
if (bRemesh)
{
r.Precompute();
r.EnableFlips = r.EnableSplits = r.EnableCollapses = true;
r.MinEdgeLength = target_edge_len;
r.MaxEdgeLength = 2 * target_edge_len;
r.EnableSmoothing = true;
r.SmoothSpeedT = 1.0f;
for (int k = 0; k < 40; ++k)
{
r.BasicRemeshPass();
}
r.SetProjectionTarget(null);
r.SmoothSpeedT = 0.25f;
for (int k = 0; k < 10; ++k)
{
r.BasicRemeshPass();
}
Debug.Assert(Mesh.CheckValidity());
r.BackPropropagate();
}
// smooth around the join region to clean up ugliness
smooth_region(Mesh, r.Region.BaseBorderV, 3);
}