0027583: Visualization, MeshVS - handle MeshVS_DA_SupressBackFaces flag within MeshVS_NodalColorPrsBuilder

and within MeshVS_ElementalColorPrsBuilder builders.

src/MeshVS/MeshVS_ElementalColorPrsBuilder.cxx

@@ -185,6 +185,7 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
   Quantity_Color       anEdgeColor, aLineColor;
   Standard_Boolean     anEdgeOn = Standard_True, IsReflect = Standard_False,
                        IsMeshSmoothShading = Standard_False;
+  Standard_Boolean toSupressBackFaces = Standard_False;
 
   aDrawer->GetColor  ( MeshVS_DA_InteriorColor, anInteriorColor );
   aDrawer->GetColor  ( MeshVS_DA_EdgeColor, anEdgeColor );
@@ -194,6 +195,7 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
   aDrawer->GetBoolean( MeshVS_DA_ShowEdges, anEdgeOn );
   aDrawer->GetBoolean( MeshVS_DA_ColorReflection, IsReflect );
   aDrawer->GetBoolean( MeshVS_DA_SmoothShading, IsMeshSmoothShading );
+  aDrawer->GetBoolean (MeshVS_DA_SupressBackFaces, toSupressBackFaces);
 
   if ( aDrawer->GetInteger ( MeshVS_DA_EdgeType, anEdgeInt) )
     anEdgeType = (Aspect_TypeOfLine) anEdgeInt;
@@ -256,12 +258,9 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
 
     TColStd_PackedMapOfInteger aCustomElements;
 
-    Prs3d_Root::NewGroup ( Prs );
+    Handle(Graphic3d_Group) aGGroup = Prs3d_Root::NewGroup (Prs);
-    Handle ( Graphic3d_Group ) aGGroup = Prs3d_Root::CurrentGroup ( Prs );
+    Handle(Graphic3d_Group) aLGroup = Prs3d_Root::NewGroup (Prs);
-    Prs3d_Root::NewGroup ( Prs );
+    Handle(Graphic3d_Group) aSGroup = Prs3d_Root::NewGroup (Prs);
-    Handle ( Graphic3d_Group ) aLGroup = Prs3d_Root::CurrentGroup ( Prs );
-    Prs3d_Root::NewGroup ( Prs );
-    Handle ( Graphic3d_Group ) aSGroup = Prs3d_Root::CurrentGroup ( Prs );
 
     Standard_Integer aNbFacePrimitives = 0;
     Standard_Integer aNbVolmPrimitives = 0;
@@ -448,6 +447,7 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
     {
       aGGroup->SetPrimitivesAspect (aFillAspect);
       aGGroup->AddPrimitiveArray (aFaceTriangles);
+      aGGroup->SetClosed (toSupressBackFaces == Standard_True);
       
       if (anEdgeOn)
       {
@@ -508,10 +508,8 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
   for ( MeshVS_DataMapIteratorOfDataMapOfTwoColorsMapOfInteger aColIter2 ( aTwoColorsOfElements );
         aColIter2.More(); aColIter2.Next() )
   {
-    Prs3d_Root::NewGroup ( Prs );
+    Handle(Graphic3d_Group) aGroup2 = Prs3d_Root::NewGroup (Prs);
-    Handle ( Graphic3d_Group ) aGroup2 = Prs3d_Root::CurrentGroup ( Prs );
+    Handle(Graphic3d_Group) aGroup3 = Prs3d_Root::NewGroup (Prs);
-    Prs3d_Root::NewGroup ( Prs );
-    Handle ( Graphic3d_Group ) aGroup3 = Prs3d_Root::CurrentGroup ( Prs );
 
     Standard_Integer aSize = aColIter2.Value().Extent();
     if ( aSize<=0 )
@@ -628,6 +626,7 @@ void MeshVS_ElementalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)&
       }
     }
 
+    aGroup2->SetClosed (toSupressBackFaces == Standard_True);
     aGroup2->AddPrimitiveArray (aFaceTriangles);
     aGroup2->SetGroupPrimitivesAspect (anAsp);
     aGroup3->AddPrimitiveArray (anEdgeSegments);

src/MeshVS/MeshVS_NodalColorPrsBuilder.cxx

@@ -473,8 +473,11 @@ void MeshVS_NodalColorPrsBuilder::Build ( const Handle(Prs3d_Presentation)& Prs,
   Handle(Graphic3d_AspectLine3d) anLAsp =
     new Graphic3d_AspectLine3d( anEdgeColor, anEdgeType, anEdgeWidth );
 
-  Prs3d_Root::NewGroup ( Prs );
+  Handle(Graphic3d_Group) aGroup1 = Prs3d_Root::NewGroup (Prs);
-  Handle(Graphic3d_Group) aGroup1 = Prs3d_Root::CurrentGroup ( Prs );
+
+  Standard_Boolean toSupressBackFaces = Standard_False;
+  aDrawer->GetBoolean (MeshVS_DA_SupressBackFaces, toSupressBackFaces);
+  aGroup1->SetClosed (toSupressBackFaces == Standard_True);
 
   aGroup1->SetPrimitivesAspect( anAsp );
   aGroup1->AddPrimitiveArray( aFaceTriangles /*aCPolyArr*/ );

tests/bugs/vis/bug26028

@@ -1,31 +1,55 @@
 puts "============="
+puts "Drawing mesh as closed object."
+puts "============="
 puts ""
-puts "============="
-puts ""
-
-##############################################################################
-## Drawing mesh as closed object.
-##############################################################################
 
 pload XDE
 
-set anImage1 $imagedir/${casename}_Opened.png
+set aMeshFile [locate_data_file sh1.stl]
-set anImage2 $imagedir/${casename}_Closed.png
 
-vinit
+vclear
-meshfromstl aMesh [locate_data_file sh1.stl]
+vinit View1
-vsetdispmode aMesh 2
+vaxo
-vfront
+
+meshfromstl  m0 "$aMeshFile"
+vsetdispmode m0 2
+
+vsetlocation -noupdate m0 -100 0 0
+meshfromstl m1 "$aMeshFile"
+meshcolors  m1 elem1 0
+vsetlocation -noupdate m1    0 0 0
+
+meshfromstl m2 "$aMeshFile"
+meshcolors  m2 elem2 0
+vsetlocation -noupdate m2  100 0 0
+
+meshfromstl m3 "$aMeshFile"
+meshcolors  m3 nodal 1
+vsetlocation -noupdate m3    0 0 100
+
+meshfromstl m4 "$aMeshFile"
+meshcolors  m4 nodaltex 1
+vsetlocation -noupdate m4  100 0 100
 vfit
 
-vclipplane create aClipPlane
+vclipplane create p
-vclipplane change aClipPlane equation 0 1 0 0
+vclipplane change p equation 0 1 0 0
-vclipplane change aClipPlane capping on
+vclipplane change p capping on
-vclipplane change aClipPlane capping color 0.9 0.9 0.9
+vclipplane change p capping color 0.9 0.9 0.9
-vclipplane set aClipPlane object aMesh
+vclipplane set    p view Driver1/Viewer1/View1
 
-meshclosed aMesh 0
+for {set i 0} {$i < 5} {incr i} { meshclosed m$i 0 }
-vdump ${anImage1}
+vdump ${imagedir}/${casename}_open.png
 
-meshclosed aMesh 1
+for {set i 0} {$i < 5} {incr i} { meshclosed m$i 1 }
-vdump ${anImage2}
+set aColor0 [vreadpixel 125 200 rgb name]
+set aColor1 [vreadpixel 225 300 rgb name]
+set aColor2 [vreadpixel 325 325 rgb name]
+set aColor3 [vreadpixel 225 150 rgb name]
+set aColor4 [vreadpixel 325 200 rgb name]
+
+if { "$aColor0" != "GRAY61" || "$aColor1" != "GRAY61" || "$aColor2" != "GRAY61" || "$aColor3" != "GRAY61" || "$aColor4" != "GRAY61" } {
+  puts "Error: capping color does not match"
+}
+
+vdump ${imagedir}/${casename}_closed.png