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Mesh - Fix periodic seam constraints (#1338)

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The base mesh algorithm created constraint links for all pcurves of an
  edge, including duplicate representations at periodic seams.
Register nodes and mesh indices for all pcurves so polygon-on-triangulation
  data remains valid, but add links only for the pcurve of the wire occurrence.
This commit is contained in:
Pasukhin Dmitry
2026-07-13 13:42:10 +01:00
committed by GitHub
parent d3042539c7
commit aa3e65da8d
5 changed files with 254 additions and 33 deletions
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75
src/ModelingAlgorithms/TKMesh/BRepMesh/BRepMesh_BaseMeshAlgo.cxx
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@@ -86,40 +86,59 @@ bool BRepMesh_BaseMeshAlgo::initDataStructure()
for (int aEdgeIt = 0; aEdgeIt < aDWire->EdgesNb(); ++aEdgeIt)
{
const IMeshData::IEdgeHandle aDEdge = aDWire->GetEdge(aEdgeIt);
const IMeshData::ICurveHandle& aCurve = aDEdge->GetCurve();
const IMeshData::ListOfInteger& aListOfPCurves = aDEdge->GetPCurves(myDFace.get());
const IMeshData::IEdgeHandle aDEdge = aDWire->GetEdge(aEdgeIt);
const IMeshData::ICurveHandle& aCurve = aDEdge->GetCurve();
// A wire defines one topological occurrence of an edge. Registering every
// pcurve attached to its face would create duplicate constraints at a periodic seam.
const IMeshData::IPCurveHandle& aPCurve =
aDEdge->GetPCurve(myDFace.get(), aDWire->GetEdgeOrientation(aEdgeIt));
const TopAbs_Orientation aOri = fixSeamEdgeOrientation(aDEdge, aPCurve);
int aPrevNodeIndex = -1;
const int aLastPoint = aPCurve->ParametersNb() - 1;
for (int aPointIndex = 0; aPointIndex <= aLastPoint; ++aPointIndex)
{
const int aNodeIndex = registerNode(aCurve->GetPoint(aPointIndex),
aPCurve->GetPoint(aPointIndex),
BRepMesh_Frontier,
false);
aPCurve->GetIndex(aPointIndex) = aNodeIndex;
if (aPrevNodeIndex != -1 && aPrevNodeIndex != aNodeIndex)
{
const int aLinksNb = myStructure->NbLinks();
const int aLinkIndex = addLinkToMesh(aPrevNodeIndex, aNodeIndex, aOri);
if (aWireIt != 0 && aLinkIndex <= aLinksNb)
{
// Prevent holes around wire of zero area.
BRepMesh_Edge& aLink = const_cast<BRepMesh_Edge&>(myStructure->GetLink(aLinkIndex));
aLink.SetMovability(BRepMesh_Fixed);
}
}
aPrevNodeIndex = aNodeIndex;
}
// Every pcurve needs node indices for Poly_PolygonOnTriangulation, but only
// the pcurve belonging to this wire occurrence defines a mesh constraint.
const IMeshData::ListOfInteger& aListOfPCurves = aDEdge->GetPCurves(myDFace.get());
for (IMeshData::ListOfInteger::Iterator aPCurveIt(aListOfPCurves); aPCurveIt.More();
aPCurveIt.Next())
{
const IMeshData::IPCurveHandle& aPCurve = aDEdge->GetPCurve(aPCurveIt.Value());
const TopAbs_Orientation aOri = fixSeamEdgeOrientation(aDEdge, aPCurve);
int aPrevNodeIndex = -1;
const int aLastPoint = aPCurve->ParametersNb() - 1;
for (int aPointIndex = 0; aPointIndex <= aLastPoint; ++aPointIndex)
const IMeshData::IPCurveHandle& anOtherPCurve = aDEdge->GetPCurve(aPCurveIt.Value());
if (anOtherPCurve == aPCurve)
{
const int aNodeIndex = registerNode(aCurve->GetPoint(aPointIndex),
aPCurve->GetPoint(aPointIndex),
BRepMesh_Frontier,
false);
continue;
}
aPCurve->GetIndex(aPointIndex) = aNodeIndex;
if (aPrevNodeIndex != -1 && aPrevNodeIndex != aNodeIndex)
{
const int aLinksNb = myStructure->NbLinks();
const int aLinkIndex = addLinkToMesh(aPrevNodeIndex, aNodeIndex, aOri);
if (aWireIt != 0 && aLinkIndex <= aLinksNb)
{
// Prevent holes around wire of zero area.
BRepMesh_Edge& aLink = const_cast<BRepMesh_Edge&>(myStructure->GetLink(aLinkIndex));
aLink.SetMovability(BRepMesh_Fixed);
}
}
aPrevNodeIndex = aNodeIndex;
const int anOtherLastPoint = anOtherPCurve->ParametersNb() - 1;
for (int aPointIndex = 0; aPointIndex <= anOtherLastPoint; ++aPointIndex)
{
anOtherPCurve->GetIndex(aPointIndex) = registerNode(aCurve->GetPoint(aPointIndex),
anOtherPCurve->GetPoint(aPointIndex),
BRepMesh_Frontier,
false);
}
}
}