try fix for occ constraints

Geo/GModelIO_OCC.cpp

@@ -599,16 +599,17 @@ static void applyOCCMeshConstraints(GModel *m, const void *constraints)
 	  // set the mesh as immutable
 	  ge->meshAttributes.Method == MESH_NONE;
 	  // set the correct tags on the boundary vertices
-	  int numbeg = nodeNum.Value(1);
-	  int numend = nodeNum.Value(n);
+	  bool invert = (nodePar.Value(1) > nodePar.Value(n));
+	  int numbeg = nodeNum.Value(invert ? n : 1);
+	  int numend = nodeNum.Value(invert ? 1 : n);
 	  Msg::Debug("Applying mesh contraints on edge %d: beg=%d end=%d", 
 		     ge->tag(), numbeg, numend);
 	  ge->getBeginVertex()->mesh_vertices[0]->setNum(numbeg);
 	  ge->getEndVertex()->mesh_vertices[0]->setNum(numend);
 	  // set the mesh on the edge
 	  for(int i = 2; i < n; i++){
-	    int num = nodeNum.Value(i);
-	    double u = nodePar.Value(i);
+	    int num = nodeNum.Value(invert ? n - i + 1 : i);
+	    double u = nodePar.Value(invert ? n - i + 1 : i);
 	    GPoint p = ge->point(u);
 	    Msg::Debug("... adding vertex on edge %d: num=%d u=%g xyz=(%g,%g,%g)",
 		       ge->tag(), num, u, p.x(), p.y(), p.z());