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This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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Change below only gets the max video memory once -

vtkGPUVolumeRayCastMapper::vtkGPUVolumeRayCastMapper() { this->AutoAdjustSampleDistances = 1; this->ImageSampleDistance = 1.0; this->MinimumImageSampleDistance = 1.0; this->MaximumImageSampleDistance = 10.0; this->SampleDistance = 1.0; this->SmallVolumeRender = 0; this->BigTimeToDraw = 0.0; this->SmallTimeToDraw = 0.0; this->FinalColorWindow = 1.0; this->FinalColorLevel = 0.5; this->GeneratingCanonicalView = 0; this->CanonicalViewImageData = NULL;

this->MaskInput = NULL; this->MaskBlendFactor = 1.0f; this->MaskType = vtkGPUVolumeRayCastMapper::LabelMapMaskType;

this->AMRMode=0; this->ClippedCroppingRegionPlanes[0]=VTK_DOUBLE_MAX; this->ClippedCroppingRegionPlanes[1]=VTK_DOUBLE_MIN; this->ClippedCroppingRegionPlanes[2]=VTK_DOUBLE_MAX; this->ClippedCroppingRegionPlanes[3]=VTK_DOUBLE_MIN; this->ClippedCroppingRegionPlanes[4]=VTK_DOUBLE_MAX; this->ClippedCroppingRegionPlanes[5]=VTK_DOUBLE_MIN;

// :ADSK: JNH, force abs on memory sizes, only calculate once static vtkIdType maxMemoryInBytes = 0 ; if ( maxMemoryInBytes == 0 ) { vtkGPUInfoList *l=vtkGPUInfoList::New(); l->Probe(); if(l->GetNumberOfGPUs()>0) { vtkGPUInfo *info=l->GetGPUInfo(0); maxMemoryInBytes=info->GetDedicatedVideoMemory();

      if( maxMemoryInBytes < 0 )
          maxMemoryInBytes *= -1 ;
	  if(maxMemoryInBytes == 0)
	  {
		  maxMemoryInBytes=info->GetDedicatedSystemMemory();
	  }
      
      if( maxMemoryInBytes < 0 )
          maxMemoryInBytes *= -1 ;
  }
  l->Delete();

  if (maxMemoryInBytes == 0)
  {
	  char* env = getenv("VTK_MAX_GPU_MEMORY_MB");
	  if (env)
	  {
		  maxMemoryInBytes = atoi(env) * 1024 * 1024;
	  }
  }

  if (maxMemoryInBytes < 0)
	  maxMemoryInBytes *= -1;

  if (maxMemoryInBytes == 0)
  {
	  // :ADSK: use some default value: 1Gb, is reasonable in 2014!
	  maxMemoryInBytes = 1024 * 1024 * 1024;
  }

}

this->MaxMemoryInBytes = maxMemoryInBytes ; this->MaxMemoryFraction = 0.75;

this->ReportProgress=true;

this->TransformedInput = NULL; this->LastInput = NULL; }