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The Maya Cloud Pattern/Texture will not operate as expected in PxrVolume because of how it calculates the falloff effect.

You can also make an emissive volume operate as a light from the PxrVolume material as explained below, but in Maya you can assign a Meshlight to the shading group node (right-click and create). If your volume has emission values then it will emit light, you may also make use of the light filter controls on the mesh light shader while the PxrVolume option does not allow for light filters.

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