[vtkusers] vtkgl::MultiTexCoord3dv in vtkOpenGLGPUVolumeRayCastMapper::RenderClippedBoundingBox

[zlf]

Hi all,

I cannot find any document about MultiTexCoord3dv. But I guess it is used to
map volume rendering image to screen. 
I do not want to render image to screen. Instead, I want to get 2d image
directly in memory. I need it to be done in extermely fast speed (less than
1ms). But MultiTexCoord3dv took about 10ms.

Any suggestion?

Regards,

superZZ

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