+ fix transparency issue, disable sample buffers when using front buffer

src/Gui/MouseSelection.cpp

@@ -55,6 +55,8 @@ void AbstractMouseSelection::grabMouseModel( Gui::View3DInventorViewer* viewer )
 {
     _pcView3D = viewer;
     m_cPrevCursor = _pcView3D->getWidget()->cursor();
+    m_antiAliasing = (int)_pcView3D->getAntiAliasingMode();
+    _pcView3D->setAntiAliasingMode(View3DInventorViewer::None);
 
     // do initialization of your mousemodel
     initialize();
@@ -67,6 +69,7 @@ void AbstractMouseSelection::releaseMouseModel()
         terminate();
 
         _pcView3D->getWidget()->setCursor(m_cPrevCursor);
+        _pcView3D->setAntiAliasingMode(View3DInventorViewer::AntiAliasing(m_antiAliasing));
         _pcView3D = 0;
     }
 }

src/Gui/MouseSelection.h

@@ -87,6 +87,7 @@ protected:
     QCursor m_cPrevCursor;
     int  m_iXold, m_iYold;
     int  m_iXnew, m_iYnew;
+    int m_antiAliasing;
     SbBool m_bInner;
     SbBool mustRedraw;
     std::vector<SbVec2s> _clPoly;

src/Gui/View3DInventorViewer.cpp

@@ -1012,6 +1012,10 @@ void View3DInventorViewer::renderFramebuffer()
     glEnable(GL_DEPTH_TEST);
 }
 
+//#define ENABLE_GL_DEPTH_RANGE
+// The calls of glDepthRange inside renderScene() causes problems with transparent objects
+// so that's why it is disabled now: http://forum.freecadweb.org/viewtopic.php?f=3&t=6037&hilit=transparency
+
 // Documented in superclass. Overrides this method to be able to draw
 // the axis cross, if selected, and to keep a continuous animation
 // upon spin.
@@ -1051,8 +1055,10 @@ void View3DInventorViewer::renderScene(void)
     glClearColor(col[0], col[1], col[2], 0.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+#if defined(ENABLE_GL_DEPTH_RANGE)
     // using 90% of the z-buffer for the background and the main node
     glDepthRange(0.1,1.0);
+#endif
 
     // Render our scenegraph with the image.
     SoGLRenderAction * glra = this->getGLRenderAction();
@@ -1074,16 +1080,20 @@ void View3DInventorViewer::renderScene(void)
             QObject::tr("Not enough memory available to display the data."));
     }
 
+#if defined (ENABLE_GL_DEPTH_RANGE)
     // using 10% of the z-buffer for the foreground node
     glDepthRange(0.0,0.1);
+#endif
 
     // Render overlay front scenegraph.
     glra->apply(this->foregroundroot);
 
     if (this->axiscrossEnabled) { this->drawAxisCross(); }
-   
+
+#if defined (ENABLE_GL_DEPTH_RANGE)
     // using the main portion of z-buffer again (for frontbuffer highlighting)
     glDepthRange(0.1,1.0);
+#endif
 
     // Immediately reschedule to get continous spin animation.
     if (this->isAnimating()) { this->scheduleRedraw(); }

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -3338,10 +3338,15 @@ void ViewProviderSketch::setEditViewer(Gui::View3DInventorViewer* viewer, int Mo
     viewer->setEditing(TRUE);
     SoNode* root = viewer->getSceneGraph();
     static_cast<Gui::SoFCUnifiedSelection*>(root)->selectionRole.setValue(FALSE);
+    antiAliasing = (int)viewer->getAntiAliasingMode();
+    if (antiAliasing != Gui::View3DInventorViewer::None)
+        viewer->setAntiAliasingMode(Gui::View3DInventorViewer::None);
 }
 
 void ViewProviderSketch::unsetEditViewer(Gui::View3DInventorViewer* viewer)
 {
+    if (antiAliasing != Gui::View3DInventorViewer::None)
+        viewer->setAntiAliasingMode(Gui::View3DInventorViewer::AntiAliasing(antiAliasing));
     viewer->setEditing(FALSE);
     SoNode* root = viewer->getSceneGraph();
     static_cast<Gui::SoFCUnifiedSelection*>(root)->selectionRole.setValue(TRUE);

src/Mod/Sketcher/Gui/ViewProviderSketch.h

@@ -264,6 +264,7 @@ protected:
     // reference coordinates for relative operations
     double xInit,yInit;
     bool relative;
+    int antiAliasing;
 };
 
 } // namespace PartGui