[vtkusers] problem with vtkOpenGLGPUVolumeRayCastMapper

[alex Dowson]

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 


dcmMapper->SetMaxMemoryInBytes(2147483648); 
dcmMapper->SetMaxMemoryFraction(0.90);
dcmMapper->SetAutoAdjustSampleDistances(1); 
dcmMapper->SetBlendModeToComposite();
dcmMapper->SetInput(dcmVImage);
dcmMapper->Update(); 


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

dcmMapper->SetMaxMemoryInBytes(4294967296); 


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

this->Loaded=textureSize[0]*textureSize[1]*textureSize[2]*vtkAbstractArray::GetDataTypeSize(scalarType)*scalars->GetNumberOfComponents()<=maxMemoryInBytes;

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. 

S


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