diff --git a/Core/Code/Rendering/mitkGLMapper.cpp b/Core/Code/Rendering/mitkGLMapper.cpp
index c0440dcacf..043e31b624 100644
--- a/Core/Code/Rendering/mitkGLMapper.cpp
+++ b/Core/Code/Rendering/mitkGLMapper.cpp
@@ -1,60 +1,60 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 
 #include "mitkGL.h"
 #include "mitkGLMapper.h"
 
 
 mitk::GLMapper::GLMapper()
 {
 }
 
 mitk::GLMapper::~GLMapper()
 {
 }
 
-void mitk::GLMapper::MitkRender(mitk::BaseRenderer* renderer, mitk::VtkPropRenderer::RenderType /* type */)
+void mitk::GLMapper::MitkRender(mitk::BaseRenderer* renderer, mitk::VtkPropRenderer::RenderType  type )
 {
   bool visible = true;
 
   GetDataNode()->GetVisibility(visible, renderer, "visible");
 
   if(!visible)
     return;
 
   // the if-condition ensures that Paint(renderer) is only called once, otherwise it will be called four times
   // it does not mean that OpenGL renders only an opaque scene
   if(type == mitk::VtkPropRenderer::Opaque)
     Paint(renderer);
 
 }
 
 bool mitk::GLMapper::IsVtkBased() const
 {
   return false;
 }
 
 void mitk::GLMapper::ApplyColorAndOpacityProperties(mitk::BaseRenderer* renderer, vtkActor* /*actor*/)
 {
     float rgba[4]={1.0f,1.0f,1.0f,1.0f};
     // check for color prop and use it for rendering if it exists
     GetDataNode()->GetColor(rgba, renderer, "color");
     // check for opacity prop and use it for rendering if it exists
     GetDataNode()->GetOpacity(rgba[3], renderer, "opacity");
 
     glColor4fv(rgba);
 }