public Mesh Repair(Mesh sourceMesh, CancellationToken cancellationToken)
{
var inMesh = sourceMesh;
try
{
if (WeldVertices)
{
inMesh = sourceMesh.Copy(cancellationToken);
if (WeldTolerance > 0)
{
inMesh.MergeVertices(.01);
}
else
{
inMesh.CleanAndMerge();
}
if (!FaceOrientation &&
RemoveMode == RemoveModes.None &&
!WeldEdges &&
!FillHoles)
{
return(inMesh);
}
}
var mesh = inMesh.ToDMesh3();
int repeatCount = 0;
int erosionIterations = 5;
double repairTolerance = MathUtil.ZeroTolerancef;
double minEdgeLengthTol = 0.0001;
repeat_all:
if (FaceOrientation)
{
// make sure orientation of connected components is consistent
// TODO: what about mobius strip problems?
RepairOrientation(mesh, cancellationToken, true);
}
if (RemoveMode != RemoveModes.None)
{
// Remove parts of the mesh we don't want before we bother with anything else
// TODO: maybe we need to repair orientation first? if we want to use MWN (MeshWindingNumber)...
RemoveInside(mesh);
cancellationToken.ThrowIfCancellationRequested();
}
if (WeldEdges || FillHoles)
{
// Do safe close-cracks to handle easy cases
RepairCracks(mesh, true, repairTolerance);
if (mesh.IsClosed())
{
goto all_done;
}
cancellationToken.ThrowIfCancellationRequested();
// Collapse tiny edges and then try easy cases again, and
// then allow for handling of ambiguous cases
CollapseAllDegenerateEdges(mesh, cancellationToken, repairTolerance * 0.5, true);
cancellationToken.ThrowIfCancellationRequested();
RepairCracks(mesh, true, 2 * repairTolerance);
cancellationToken.ThrowIfCancellationRequested();
RepairCracks(mesh, false, 2 * repairTolerance);
cancellationToken.ThrowIfCancellationRequested();
if (mesh.IsClosed())
{
goto all_done;
}
// Possibly we have joined regions with different orientation (is it?), fix that
// TODO: mobius strips again
RepairOrientation(mesh, cancellationToken, true);
cancellationToken.ThrowIfCancellationRequested();
// get rid of any remaining single-triangles before we start filling holes
MeshEditor.RemoveIsolatedTriangles(mesh);
}
if (FillHoles)
{
// Ok, fill simple holes.
int nRemainingBowties = 0;
FillTrivialHoles(mesh, cancellationToken, out int nHoles, out bool bSawSpans);
cancellationToken.ThrowIfCancellationRequested();
if (mesh.IsClosed())
{
goto all_done;
}
// Now fill harder holes. If we saw spans, that means boundary loops could
// not be resolved in some cases, do we disconnect bowties and try again.
FillAnyHoles(mesh, cancellationToken, out nHoles, out bSawSpans);
cancellationToken.ThrowIfCancellationRequested();
if (bSawSpans)
{
DisconnectBowties(mesh, out nRemainingBowties);
FillAnyHoles(mesh, cancellationToken, out nHoles, out bSawSpans);
}
cancellationToken.ThrowIfCancellationRequested();
if (mesh.IsClosed())
{
goto all_done;
}
// We may have a closed mesh now but it might still have bowties (eg
// tetrahedra sharing vtx case). So disconnect those.
DisconnectBowties(mesh, out nRemainingBowties);
cancellationToken.ThrowIfCancellationRequested();
// If the mesh is not closed, we will do one more round to try again.
if (repeatCount == 0 && mesh.IsClosed() == false)
{
repeatCount++;
goto repeat_all;
}
// Ok, we didn't get anywhere on our first repeat. If we are still not
// closed, we will try deleting boundary triangles and repeating.
// Repeat this N times.
if (repeatCount <= erosionIterations && mesh.IsClosed() == false)
{
repeatCount++;
var bdry_faces = new MeshFaceSelection(mesh);
foreach (int eid in MeshIterators.BoundaryEdges(mesh))
{
bdry_faces.SelectEdgeTris(eid);
}
MeshEditor.RemoveTriangles(mesh, bdry_faces, true);
goto repeat_all;
}
}
all_done:
// and do a final clean up of the model
if (FillHoles)
{
// Remove tiny edges
if (minEdgeLengthTol > 0)
{
CollapseAllDegenerateEdges(mesh, cancellationToken, minEdgeLengthTol, false);
}
cancellationToken.ThrowIfCancellationRequested();
// finally do global orientation
RepairOrientation(mesh, cancellationToken, true);
cancellationToken.ThrowIfCancellationRequested();
}
return(mesh.ToMesh());
}
catch (OperationCanceledException)
{
return(inMesh);
}
}
public bool Apply()
{
bool do_checks = false;
if (do_checks)
{
Mesh.CheckValidity();
}
/*
* Remove parts of the mesh we don't want before we bother with anything else
* TODO: maybe we need to repair orientation first? if we want to use MWN...
*/
do_remove_inside();
if (Cancelled())
{
return(false);
}
int repeat_count = 0;
repeat_all:
/*
* make sure orientation of connected components is consistent
* TODO: what about mobius strip problems?
*/
repair_orientation(false);
if (Cancelled())
{
return(false);
}
/*
* Do safe close-cracks to handle easy cases
*/
repair_cracks(true, RepairTolerance);
if (Mesh.IsClosed())
{
goto all_done;
}
if (Cancelled())
{
return(false);
}
/*
* Collapse tiny edges and then try easy cases again, and
* then allow for handling of ambiguous cases
*/
collapse_all_degenerate_edges(RepairTolerance * 0.5, true);
if (Cancelled())
{
return(false);
}
repair_cracks(true, 2 * RepairTolerance);
if (Cancelled())
{
return(false);
}
repair_cracks(false, 2 * RepairTolerance);
if (Cancelled())
{
return(false);
}
if (Mesh.IsClosed())
{
goto all_done;
}
/*
* Possibly we have joined regions with different orientation (is it?), fix that
* TODO: mobius strips again
*/
repair_orientation(false);
if (Cancelled())
{
return(false);
}
if (do_checks)
{
Mesh.CheckValidity();
}
// get rid of any remaining single-triangles before we start filling holes
remove_loners();
/*
* Ok, fill simple holes.
*/
int nRemainingBowties = 0;
int nHoles; bool bSawSpans;
fill_trivial_holes(out nHoles, out bSawSpans);
if (Cancelled())
{
return(false);
}
if (Mesh.IsClosed())
{
goto all_done;
}
/*
* Now fill harder holes. If we saw spans, that means boundary loops could
* not be resolved in some cases, do we disconnect bowties and try again.
*/
fill_any_holes(out nHoles, out bSawSpans);
if (Cancelled())
{
return(false);
}
if (bSawSpans)
{
disconnect_bowties(out nRemainingBowties);
fill_any_holes(out nHoles, out bSawSpans);
}
if (Cancelled())
{
return(false);
}
if (Mesh.IsClosed())
{
goto all_done;
}
/*
* We may have a closed mesh now but it might still have bowties (eg
* tetrahedra sharing vtx case). So disconnect those.
*/
disconnect_bowties(out nRemainingBowties);
if (Cancelled())
{
return(false);
}
/*
* If the mesh is not closed, we will do one more round to try again.
*/
if (repeat_count == 0 && Mesh.IsClosed() == false)
{
repeat_count++;
goto repeat_all;
}
/*
* Ok, we didn't get anywhere on our first repeat. If we are still not
* closed, we will try deleting boundary triangles and repeating.
* Repeat this N times.
*/
if (repeat_count <= ErosionIterations && Mesh.IsClosed() == false)
{
repeat_count++;
MeshFaceSelection bdry_faces = new MeshFaceSelection(Mesh);
foreach (int eid in MeshIterators.BoundaryEdges(Mesh))
{
bdry_faces.SelectEdgeTris(eid);
}
MeshEditor.RemoveTriangles(Mesh, bdry_faces, true);
goto repeat_all;
}
all_done:
/*
* Remove tiny edges
*/
if (MinEdgeLengthTol > 0)
{
collapse_all_degenerate_edges(MinEdgeLengthTol, false);
}
if (Cancelled())
{
return(false);
}
/*
* finally do global orientation
*/
repair_orientation(true);
if (Cancelled())
{
return(false);
}
if (do_checks)
{
Mesh.CheckValidity();
}
/*
* Might as well compact output mesh...
*/
Mesh = new DMesh3(Mesh, true);
MeshNormals.QuickCompute(Mesh);
return(true);
}
