[vtkusers] the detail of GPU based ray-casting

[qlizhi]

 Hi, i was reading  the source code of VTK/Rendering/VolumeOpenGL/vtkOpenGLGPUVolumeRayCastMapper.cxx, and at line     4255:
                                  
  float fvalue[2];
  int ivalue=0;
  v->SetUniformi("dataSetTexture",1,&ivalue);

I  do not understand how it  set the dataSet available on texture  unit 0.   And, i am not sure the noise texture used for,  i know the the  theory of GPU based ray-casting . But when it comes to VTK, i find so much to learn. So i need your help! 




qlizhi
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