0023782: Intersection algorithm produces wrong section curves for the attached faces

The fix is to keep the correlation between numbers of segments in U and V parametric directions (nbu and nbv).
When minimal of these numbers (f.e. nbu) is set to default minimal value (10), other (nbv) is set to Min(30, nbv*(default/nbu)). 30 is used to avoid too small segments.
Added test case bugs/modalg_5/bug23782

diff --git a/src/Adaptor3d/Adaptor3d_TopolTool.cxx b/src/Adaptor3d/Adaptor3d_TopolTool.cxx
index 0fea9e6..cfaa83d 100755 (executable)
--- a/src/Adaptor3d/Adaptor3d_TopolTool.cxx
+++ b/src/Adaptor3d/Adaptor3d_TopolTool.cxx
@@ -976,6 +976,23 @@ void Adaptor3d_TopolTool::BSplSamplePnts(const Standard_Real theDefl,
   Standard_Boolean bUuniform = Standard_False;
   Standard_Boolean bVuniform = Standard_False;
 
+  //modified by NIZHNY-EMV Mon Jun 10 14:19:04 2013
+  if (nbsu < theNUmin || nbsv < theNVmin) {
+    Standard_Integer aNb;
+    if (nbsu < nbsv) {
+      aNb = (Standard_Integer)(nbsv * ((Standard_Real)theNUmin)/((Standard_Real)nbsu));
+      aNb = Min(aNb, 30);
+      bVuniform = (aNb > nbsv) ? Standard_True : bVuniform;
+      nbsv = bVuniform ? aNb : nbsv;
+    } else {
+      aNb = (Standard_Integer)(nbsu * ((Standard_Real)theNVmin)/((Standard_Real)nbsv));
+      aNb = Min(aNb, 30);
+      bUuniform = (aNb > nbsu) ? Standard_True : bUuniform;
+      nbsu = bUuniform ? aNb : nbsu;
+    }
+  }
+  //modified by NIZHNY-EMV Mon Jun 10 14:19:05 2013
+
   if(nbsu < theNUmin) {
     nbsu = theNUmin;
     bUuniform = Standard_True;

diff --git a/tests/bugs/modalg_5/bug23782 b/tests/bugs/modalg_5/bug23782
new file mode 100644 (file)
index 0000000..999f5c3
--- /dev/null
+++ b/tests/bugs/modalg_5/bug23782
@@ -0,0 +1,19 @@
+puts "========="
+puts "OCC23782"
+puts "========="
+puts ""
+#################################################################################
+# Intersection algorithm produces wrong section curves for the attached faces
+#################################################################################
+
+restore [locate_data_file bug23782_c.brep] f
+
+explode f
+bsection result f_1 f_2
+
+set nbsh_t 1
+set nb_v_good 2
+set nb_e_good 1
+
+set 2dviewer 0
+