0027832: Visualization - Scaled zbuffer trihedron

Code cleanup and test case modified.

src/BRepMesh/BRepMesh_ConeRangeSplitter.cxx

@@ -35,17 +35,13 @@ std::pair<Standard_Real, Standard_Real> BRepMesh_ConeRangeSplitter::GetSplitStep
   Standard_Real aRadius = Max(Abs(aRefR + aRangeV.first  * Sin(aSAng)),
                               Abs(aRefR + aRangeV.second * Sin(aSAng)));
 
-  //Face deflection used to determine circle subdivisions needs to match the one used previously
   Standard_Real Dv, Du = GCPnts_TangentialDeflection::ArcAngularStep(
-    aRadius, GetDFace()->GetDeflection()*0.5,
+    aRadius, GetDFace()->GetDeflection(),
     theParameters.Angle, theParameters.MinSize);
 
   const Standard_Real aDiffU = aRangeU.second - aRangeU.first;
   const Standard_Real aDiffV = aRangeV.second - aRangeV.first;
-  //compute subdivision factor acounting for the difference between the bottom and top radius of the cone
-  const Standard_Real aTopRadius = aRefR > Precision::Confusion() ? aRefR : 1.0;
-  const Standard_Real aSubDivFactor = Max(theParameters.MinSize, Min(1.0, aTopRadius > aRadius ? aRadius / aTopRadius : aTopRadius / aRadius));
-  const Standard_Real aScale = (Du * aRadius * aSubDivFactor);
+  const Standard_Real aScale = (Du * aRadius);
   const Standard_Real aRatio = Max(1., Log(aDiffV / aScale));
   const Standard_Integer nbU = (Standard_Integer)(aDiffU / Du);
   const Standard_Integer nbV = (Standard_Integer)(aDiffV / aScale / aRatio);

src/Graphic3d/Graphic3d_TransformPers.hxx

@@ -409,6 +409,17 @@ void Graphic3d_TransformPers::Apply (const Handle(Graphic3d_Camera)& theCamera,
     }
 
     NCollection_Mat4<Standard_Real> aWorldView = theCamera->OrientationMatrix();
+    
+    //Adjust the camera axial scale for trihedron behaviour 
+    gp_XYZ anAxialScale = theCamera->AxialScale();
+    Standard_Real anAxialX = anAxialScale.X();
+    Standard_Real anAxialY = anAxialScale.Y();
+    Standard_Real anAxialZ = anAxialScale.Z();
+    if (anAxialX > 0.0 && anAxialY > 0.0 && anAxialZ > 0.0)
+    {
+      Graphic3d_TransformUtils::Scale (aWorldView, 1.0 / anAxialX, 1.0 / anAxialY, 1.0 / anAxialZ);
+    }
+    
     Graphic3d_TransformUtils::Translate (aWorldView, aCenter.X(), aCenter.Y(), aCenter.Z());
     Graphic3d_TransformUtils::Scale     (aWorldView, aScale,      aScale,      aScale);
     theWorldView.ConvertFrom (aWorldView);

src/StdPrs/StdPrs_ShadedShape.cxx

@@ -210,9 +210,9 @@ namespace
         {
           const gp_Pnt2d aNode2d = aT->UVNode (aNodeIter);
           const gp_Pnt2d aTexel = (dUmax == 0.0 || dVmax == 0.0)
-            ? aNode2d
-            : gp_Pnt2d ((-theUVOrigin.X() + (theUVRepeat.X() * (aNode2d.X() - aUmin)) / dUmax) / theUVScale.X(),
-              (-theUVOrigin.Y() + (theUVRepeat.Y() * (aNode2d.Y() - aVmin)) / dVmax) / theUVScale.Y());
+                                ? aNode2d
+                                : gp_Pnt2d ((-theUVOrigin.X() + (theUVRepeat.X() * (aNode2d.X() - aUmin)) / dUmax) / theUVScale.X(),
+                                            (-theUVOrigin.Y() + (theUVRepeat.Y() * (aNode2d.Y() - aVmin)) / dVmax) / theUVScale.Y());
           anArray->AddVertex (aPoint, aNorm, aTexel);
         }
         else

tests/v3d/trihedron/bug27832

@@ -0,0 +1,46 @@
+puts "========"
+puts "0027832: Visualization - Scaled zbuffer trihedron"
+puts "========"
+puts ""
+
+pload MODELING VISUALIZATION
+vinit
+box b 10 10 10
+vdisplay b
+vfit
+vsetdispmode 1
+vzbufftrihedron -on
+#draw initial picture of box without visual scale
+vdump $imagedir/${casename}_unscaled.png
+
+#draw picture of box after visual scale
+#and zoomed out
+vscale 1 3 10
+vzoom 0.99
+
+set color_1 [vreadpixel 55 360 -rgb -name]
+set color_2 [vreadpixel 50 350 -rgb -name]
+set color_3 [vreadpixel 55 355 -rgb -name]
+
+if {$color_1 != "RED3"} {
+  puts "ERROR: trihedron does not maintain position"
+  puts "       additional investigation is needed"
+  puts "       expected color is: RED3"
+  puts "       current color is:  $color_1"
+}
+
+if {$color_2 != "BLUE3"} {
+  puts "ERROR: trihedron does not maintain position"
+  puts "       additional investigation is needed"
+  puts "       expected color is: BLUE3"
+  puts "       current color is:  $color_2"
+}
+
+if {$color_3 != "GREEN3"} {
+  puts "ERROR: trihedron does not maintain position"
+  puts "       additional investigation is needed"
+  puts "       expected color is: GREEN3"
+  puts "       current color is:  $color_3"
+}
+
+vdump $imagedir/${casename}_scaled.png