0029149: BRepMesh produces invalid mesh on the bound of adjacent faces

1. Test case for the issue has been created. The issue is fixed by the patch #26106.

2. Since now, "tricheck" command uses edge tolerance instead of edge deflection to check cross-face-errors (set of nodes of the edge on 1st face must be equal to set of nodes of the same edge on 2nd face).

src/MeshTest/MeshTest_CheckTopology.cxx

@@ -110,7 +110,7 @@ void MeshTest_CheckTopology::Perform (Draw_Interpretor& di)
       }
 
       // check distances between corresponding points
-      Standard_Real aSqDefle = Max(aT1->Deflection(), aT2->Deflection());
+      Standard_Real aSqDefle = BRep_Tool::Tolerance(aEdge);
       aSqDefle *= aSqDefle;
       const TColgp_Array1OfPnt& aPoints1 = aT1->Nodes();
       const TColgp_Array1OfPnt& aPoints2 = aT2->Nodes();

tests/bugs/mesh/bug29149

@@ -0,0 +1,36 @@
+puts "======="
+puts "0029149: BRepMesh produces invalid mesh on the bound of adjacent faces"
+puts "======="
+puts ""
+
+restore [locate_data_file bug29149.brep] result
+tclean result
+incmesh result 0.1
+
+checktrinfo result -tri 7998 -nod 4931 -defl 1.2277233425620309
+
+# Reduce shape tolerance in order to hard check of mesh quality
+settolerance result 1.0e-7
+
+if { [llength [tricheck result] ] != 0 } {
+  puts "Error : Invalid mesh"
+} else {
+  puts "Mesh is OK"
+}
+
+smallview
+isos result 0
+triangles result
+
+point p1 288.65908971200806 148.1268376105981 -99.370459908186973
+point p2 288.66203942568802 148.1262245331892 -99.373827710063281
+point p3 288.66358529587593 148.129348718649 -99.365721723137995
+don p1 p2 p3
+fit
+
+don result
+checkview -screenshot -2d -path ${imagedir}/${test_image}_zoom.png
+
+fit
+checkview -screenshot -2d -path ${imagedir}/${test_image}_nozoom.png
+

tests/mesh/data/advanced/B2

@@ -1,5 +1,7 @@
 set TheFileName OCC22145.stp
 set bug_freenodes "OCC22687"
+set bug_cross "OCC22687"
+set nbcross(ALL) 8
 if { [string compare $command "shading"] == 0 } {
   set nbfreenodes(ALL) 4
 } else {

tests/mesh/data/advanced/B3

@@ -1,5 +1,7 @@
 set TheFileName OCC22145.stp
 set bug_freenodes "OCC22687"
+set bug_cross "OCC22687"
+set nbcross(ALL) 8
 if { [string compare $command "shading"] == 0 } {
   set nbfreenodes(ALL) 4
 } else {

tests/mesh/data/advanced/B7

@@ -1,6 +1,8 @@
 set TheFileName OCC22302.brep
 set bug_freenodes "OCC22687"
 set bug_area "OCC22687"
+set bug_cross "OCC22687"
+set nbcross(ALL) 8
 if { [string compare $command "shading"] == 0 } {
   set nbfreenodes(ALL) 4
 } else {

tests/mesh/data/standard/C9

@@ -6,4 +6,6 @@ set TheFileName shading_027.brep
 ###set bug_withouttri "OCC23106"
 ###set nbwithouttri(All) 1
 set bug_freenodes "OCC23105"
+set bug_cross "OCC23105"
 set nbfreenodes(All) 2
+set nbcross(ALL) 1

tests/mesh/data/standard/H5

@@ -1,3 +1,3 @@
 set TheFileName shading_068.brep
-###set bug_cross "OCC22687"
-###set nbcross(ALL) 1
+set bug_cross "OCC22687"
+set nbcross(ALL) 2

tests/mesh/data/standard/V9

@@ -1 +1,3 @@
 set TheFileName shading_wrongshape_020.brep
+set bug_cross "OCC22687"
+set nbcross(ALL) 2

tests/mesh/data/standard/W2

@@ -1,6 +1,6 @@
 set TheFileName shading_wrongshape_022.brep
 
+set bug_cross "OCC22687"
+set nbcross(All) 2
 if { [string compare $command "shading"] != 0 } {
-#set bug_cross "OCC22687"
-#set nbcross(All) 2
 }

tests/mesh/data/standard/X1

@@ -3,6 +3,8 @@ set TheFileName shading_wrongshape_030.brep
 ###set rel_tol 6
 ###set bug_withouttri "OCC22687"
 ###set nbwithouttri(All) 4
+set bug_cross "OCC22687"
+set nbcross(All) 4
 if { [string compare $command "shading"] == 0 } {
   set rel_tol 0.5456843734442471
 } else {