RENDERMAN 22 DOCUMENTATION

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RfK will internally create primvars for all grids found in the VDB file (float or vector3). There is no penalty if they are not used. These primvars are accessed by the shading network via the PxrPrimvar pattern node:

 

 

Connect the result of PxrPrimvar directly to the PxrVolume shading node, or wire it through other shading nodes, as in the image below:

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