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0026664: Triangulating a very small polygon fails

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Parameter for adaptive computation of minimal 2D meshing precision added in BRepMesh_IncrementalMesh API.
Corresponding option -adaptive added in DRAW command

All meshing parameters are collected in structure, BRepMesh_FastDiscret::Parameters, which is now used to define and manipulate parameters of the algorithm.
This commit is contained in:
pdn
2015-09-08 18:51:33 +03:00
committed by bugmaster
parent 6b84c3f7db
commit e71669c6e5
16 changed files with 309 additions and 362 deletions
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47
src/BRepMesh/BRepMesh_FaceAttribute.cxx
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@@ -18,6 +18,12 @@
#include <BRepMesh_ShapeTool.hxx>
#include <BRepMesh_Classifier.hxx>
#include <BRepTools.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS_Wire.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Iterator.hxx>
#include <BRep_Tool.hxx>
//=======================================================================
@@ -32,7 +38,9 @@ BRepMesh_FaceAttribute::BRepMesh_FaceAttribute()
myVMax (0.),
myDeltaX (1.),
myDeltaY (1.),
myStatus (BRepMesh_NoError)
myMinStep (-1.),
myStatus (BRepMesh_NoError),
myAdaptiveMin (Standard_False)
{
init();
}
@@ -44,7 +52,8 @@ BRepMesh_FaceAttribute::BRepMesh_FaceAttribute()
BRepMesh_FaceAttribute::BRepMesh_FaceAttribute(
const TopoDS_Face& theFace,
const BRepMesh::HDMapOfVertexInteger& theBoundaryVertices,
const BRepMesh::HDMapOfIntegerPnt& theBoundaryPoints)
const BRepMesh::HDMapOfIntegerPnt& theBoundaryPoints,
const Standard_Boolean theAdaptiveMin)
: myDefFace (0.),
myUMin (0.),
myUMax (0.),
@@ -52,7 +61,9 @@ BRepMesh_FaceAttribute::BRepMesh_FaceAttribute(
myVMax (0.),
myDeltaX (1.),
myDeltaY (1.),
myMinStep (-1.),
myStatus (BRepMesh_NoError),
myAdaptiveMin (theAdaptiveMin),
myBoundaryVertices(theBoundaryVertices),
myBoundaryPoints (theBoundaryPoints),
myFace (theFace)
@@ -86,6 +97,32 @@ void BRepMesh_FaceAttribute::init()
myFace.Orientation(TopAbs_FORWARD);
BRepTools::UVBounds(myFace, myUMin, myUMax, myVMin, myVMax);
if (myAdaptiveMin)
{
// compute minimal UV distance
// between vertices
myMinStep = RealLast();
for (TopExp_Explorer anExp(myFace, TopAbs_WIRE); anExp.More(); anExp.Next())
{
TopoDS_Wire aWire = TopoDS::Wire(anExp.Current());
for (TopoDS_Iterator aWireExp(aWire); aWireExp.More(); aWireExp.Next())
{
TopoDS_Edge anEdge = TopoDS::Edge(aWireExp.Value());
if (BRep_Tool::IsClosed(anEdge))
continue;
// Get end points on 2d curve
gp_Pnt2d aFirst2d, aLast2d;
BRep_Tool::UVPoints(anEdge, myFace, aFirst2d, aLast2d);
Standard_Real aDist =aFirst2d.Distance(aLast2d);
if (aDist < myMinStep)
myMinStep = aDist;
}
}
}
BRepAdaptor_Surface aSurfAdaptor(myFace, Standard_False);
mySurface = new BRepAdaptor_HSurface(aSurfAdaptor);
}
@@ -111,7 +148,11 @@ Standard_Real BRepMesh_FaceAttribute::computeParametricTolerance(
const Standard_Real theLastParam) const
{
const Standard_Real aDeflectionUV = 1.e-05;
return Max(Precision::PConfusion(), (theLastParam - theFirstParam) * aDeflectionUV);
Standard_Real aPreci = (theLastParam - theFirstParam) * aDeflectionUV;
if(myAdaptiveMin && myMinStep < aPreci)
aPreci = myMinStep;
return Max(Precision::PConfusion(), aPreci);
}
//=======================================================================