239343: OCC fails to work with offset surfaces with singularities

[occt.git] / src / ShapeAnalysis / ShapeAnalysis_Surface.cxx

diff --git a/src/ShapeAnalysis/ShapeAnalysis_Surface.cxx b/src/ShapeAnalysis/ShapeAnalysis_Surface.cxx
index f365dc8..6230b39 100755 (executable)
--- a/src/ShapeAnalysis/ShapeAnalysis_Surface.cxx
+++ b/src/ShapeAnalysis/ShapeAnalysis_Surface.cxx
@@ -997,9 +997,14 @@ gp_Pnt2d ShapeAnalysis_Surface::ValueOfUV(const gp_Pnt& P3D,const Standard_Real
 //  Forcer appel a IsU-VClosed
        if (myUCloseVal < 0) IsUClosed();
        if (myVCloseVal < 0) IsVClosed();
-       //modified by rln during fixing CSR # BUC60035 entity #D231
-       Standard_Real du = Min (myUDelt, SurfAdapt.UResolution (preci)),
-                     dv = Min (myVDelt, SurfAdapt.VResolution (preci));
+    Standard_Real du = 0., dv = 0.;
+    //extension of the surface range is limited to non-offset surfaces as the latter
+    //can throw exception (e.g. Geom_UndefinedValue) when computing value - see id23943
+    if (!mySurf->IsKind (STANDARD_TYPE (Geom_OffsetSurface))) {
+      //modified by rln during fixing CSR # BUC60035 entity #D231
+      du = Min (myUDelt, SurfAdapt.UResolution (preci));
+      dv = Min (myVDelt, SurfAdapt.VResolution (preci));
+    }
         myExtSrf = mySurf;
        Standard_Real Tol = Precision::PConfusion();
         myExtPS.SetFlag (Extrema_ExtFlag_MIN);