[vtkusers] How to make vtkGPUVolumeRaycastMapper works fast on ubuntu

[Emptystack]

Hello everyone, 

I have write a volume rendering demo on linux using the
vtkGPUVolumeRaycastMapper, but it works very slowly. I test the same code on
windows system, but It works very fast. I dont't know why this happened?
Does anyone know how to increase its rendering speed on ubuntu? 

Many thanks! 



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