BUG: Fix visible cell selection in ParaViews MPIRenderServer mode by...

BUG: Fix visible cell selection in ParaViews MPIRenderServer mode by preventing interpolation. BUG: Make selection use back buffer in parallel rendering.

Parallel/vtkCompositeRenderManager.cxx

@@ -23,7 +23,7 @@
 #include "vtkTimerLog.h"
 #include "vtkUnsignedCharArray.h"
 
-vtkCxxRevisionMacro(vtkCompositeRenderManager, "1.9");
+vtkCxxRevisionMacro(vtkCompositeRenderManager, "1.10");
 vtkStandardNewMacro(vtkCompositeRenderManager);
 
 vtkCxxSetObjectMacro(vtkCompositeRenderManager, Compositer, vtkCompositer);
@@ -68,7 +68,10 @@ void vtkCompositeRenderManager::PreRenderProcessing()
 {
   // Turn swap buffers off before the render so the end render method has a
   // chance to add to the back buffer.
-  this->RenderWindow->SwapBuffersOff();
+  if (this->UseBackBuffer)
+    {
+    this->RenderWindow->SwapBuffersOff();
+    }
 }
 
 //----------------------------------------------------------------------------
@@ -108,8 +111,11 @@ void vtkCompositeRenderManager::PostRenderProcessing()
 
   this->WriteFullImage();
 
-  // Swap buffers here.
-  this->RenderWindow->SwapBuffersOn();
+  // Swap buffers here
+  if (this->UseBackBuffer)
+    {
+    this->RenderWindow->SwapBuffersOn();
+    }
   this->RenderWindow->Frame();
 }
 

Parallel/vtkParallelRenderManager.cxx

@@ -70,7 +70,7 @@ const int vtkParallelRenderManager::REN_INFO_DOUBLE_SIZE =
 const int vtkParallelRenderManager::LIGHT_INFO_DOUBLE_SIZE =
   sizeof(vtkParallelRenderManager::LightInfoDouble)/sizeof(double);
 
-vtkCxxRevisionMacro(vtkParallelRenderManager, "1.67");
+vtkCxxRevisionMacro(vtkParallelRenderManager, "1.68");
 
 //----------------------------------------------------------------------------
 vtkParallelRenderManager::vtkParallelRenderManager()
@@ -125,6 +125,8 @@ vtkParallelRenderManager::vtkParallelRenderManager()
 
   this->AddedRMIs = 0;
   this->Timer = vtkTimerLog::New();
+  
+  this->UseBackBuffer = 1;
 }
 
 //----------------------------------------------------------------------------
@@ -218,6 +220,10 @@ void vtkParallelRenderManager::PrintSelf(ostream &os, vtkIndent indent)
   os << indent << "ForceRenderWindowSize: "
      << this->ForceRenderWindowSize
      << endl;
+
+  os << indent << "UseBackBuffer: "
+     << (this->UseBackBuffer ? "on" : "off") << endl;
+
 }
 
 //----------------------------------------------------------------------------

Parallel/vtkParallelRenderManager.h

@@ -378,6 +378,15 @@ public:
 # pragma reset woff 3303
 #endif
 
+  //Description:
+  //The default is to allow the use of the back buffer for compositing.
+  //If set to false, this will prevent to manager from swapping buffers.
+  //This allows something else (for instance VisibleCellSelection) to
+  //control front/back buffer swapping.
+  vtkSetMacro(UseBackBuffer, int);
+  vtkGetMacro(UseBackBuffer, int);
+  vtkBooleanMacro(UseBackBuffer, int);
+
 protected:
   vtkParallelRenderManager();
   ~vtkParallelRenderManager();
@@ -553,6 +562,8 @@ protected:
 //ETX
 
   int AddedRMIs;
+
+  int UseBackBuffer;
 private:
   vtkParallelRenderManager(const vtkParallelRenderManager &); //Not implemented
   void operator=(const vtkParallelRenderManager &);  //Not implemented