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0029405: Modeling Algorithms - Check normal define status in HLRBRep_Data

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Fixed exception when trying to calculate line and edge normal in methods HLRBRep_Data::OrientOutLine and HLRBRep_Data::OrientOthEdge, added a check for the existence of the normal before subsequent calculations. A correct check for zero derivative, correction of floating point error and division by zero determinant directly in HLRBRep_EdgeFaceTool::CurvatureValue was set.
This commit is contained in:
vkuzin 2021-08-13 14:43:22 +03:00 committed by smoskvin
parent f1c209dc77
commit 96b92906de
3 changed files with 69 additions and 56 deletions
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4
src/HLRBRep/HLRBRep_Data.cxx
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@ -1543,6 +1543,7 @@ Standard_Boolean HLRBRep_Data::OrientOutLine (const Standard_Integer I, HLRBRep_
V = gp_Dir(0,0,-1);
}
V.Transform(TI);
if (mySLProps.IsNormalDefined()) {
Standard_Real curv = HLRBRep_EdgeFaceTool::CurvatureValue
(iFaceGeom,pu,pv,V);
gp_Vec Nm = mySLProps.Normal();
@ -1581,6 +1582,7 @@ Standard_Boolean HLRBRep_Data::OrientOutLine (const Standard_Integer I, HLRBRep_
}
eb1->Orientation(ie1, myFEOri);
}
}
else {
#ifdef OCCT_DEBUG
std::cout << "HLRBRep_Data::OrientOutLine " << I;
@ -1627,6 +1629,7 @@ void HLRBRep_Data::OrientOthEdge (const Standard_Integer I,
if (HLRBRep_EdgeFaceTool::UVPoint(p,myFEGeom,iFaceGeom,pu,pv)) {
gp_Pnt Pt = EC.Value3D(p);
mySLProps.SetParameters(pu,pv);
if (mySLProps.IsNormalDefined()) {
gp_Vec Nm = mySLProps.Normal();
Pt.Transform(T);
Nm.Transform(T);
@ -1642,6 +1645,7 @@ void HLRBRep_Data::OrientOthEdge (const Standard_Integer I,
eb1->Orientation(ie1, myFEOri);
}
}
}
#ifdef OCCT_DEBUG
else {
std::cout << "HLRBRep_Data::OrientOthEdge " << I;

6
src/HLRBRep/HLRBRep_EdgeFaceTool.cxx
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@ -45,14 +45,14 @@ Standard_Real HLRBRep_EdgeFaceTool::CurvatureValue
Standard_Real nmu2 = D1U*D1U;
Standard_Real nmv2 = D1V*D1V;
Standard_Real det = nmu2 * nmv2 - d1ud1v * d1ud1v;
if (det > gp::Resolution()) {
Standard_Real alfa = (d1ut * nmv2 - d1vt * d1ud1v) / det;
Standard_Real beta = (d1vt * nmu2 - d1ut * d1ud1v) / det;
gp_Vec Nm = D1U ^ D1V;
if (Nm.Magnitude() > gp::Resolution()) {
Nm.Normalize();
Standard_Real alfa2 = alfa * alfa;
Standard_Real beta2 = beta * beta;
Standard_Real alfabeta = alfa * beta;
gp_Vec Nm = D1U ^ D1V;
Nm.Normalize();
Standard_Real N = (Nm * D2U) * alfa2 + 2 * (Nm * D2UV) * alfabeta + (Nm * D2V) * beta2;
Standard_Real D = nmu2 * alfa2 + 2 * d1ud1v * alfabeta + nmv2 * beta2;
return N / D;

9
tests/bugs/modalg_7/bug29405 Normal file
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@ -0,0 +1,9 @@
puts "============================================"
puts "OCC29405: Modeling Algorithms - Check normal define status in HLRBRep_Data"
puts "============================================"
puts ""
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ptorus t 17.37 17.37 [dval 2.35*180/pi]
vdisplay t
vcomputehlr t t2 -algotype algo 0 50 0 0 -50 0 0 0 1