[vtkusers] problem with vtkOpenGLGPUVolumeRayCastMapper

alex Dowson alexdowson at hotmail.com
Fri Feb 1 00:34:28 EST 2013

May be case of 32 bit operating system ? 

From: Sergio Aguirre 
Sent: Friday, February 01, 2013 10:37 AM
To: vtkusers at vtk.org 
Subject: [vtkusers] problem with vtkOpenGLGPUVolumeRayCastMapper

Hi everyone 

I recently upgraded my video card from a FirePro V7900 with 2GB to a FirePro W7000 with 4GB 

I have been consistently been using vtkGPUVolumeRayCastMapperand thus vtkOpenGLGPUVolumeRayCastMapper to volume render medical datasets with the following set up 


So in order to take advantage of the 4GB of my new video card I decided to change the max memory amount 


However, once I do that the applications crash. 

I have followed in debug at what point does it crash: 

Apparently the variable "Loaded" of vtkOpenGLGPUVolumeRayCastMapper changes from TRUE to FALSE at line 790


and thus the application later crashes in line 1071

  vtkIdType *GetLoadedExtent()
      assert("pre: loaded" && this->Loaded);
      return this->LoadedExtent;

If I maintain the maxmemory ivar to 2GB all works OK, once I place it over 2GB it fails. 

I noticed that vtkOpenGLGPUVolumeRayCastMapper has a local maxMemoryInBytes which is 2147483648

Do I need to change this value and recompile/install VTK in order to use the 4GB of my video card? 

Any suggestion would be appreciated. 


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