How to export ROP Volume Texture with colour information?

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I want to be able to export a volume texture using the ROP Volume Texture, but retaining the colour information in the volume.

But even with colour information as a Cd channel in VDB (which I can see is there in the Volume Visualization SOP), the output is always black and white.

Is there a way to retain and export the colour information?

As a possibly related question, when I try to connect up a pyro sim to the ROP Volume Texture node, it doesn't work and throws this error:

Invalid source /obj/geo1/rop_volume_texture1/vdb2
Error: ArithmeticError: Non-zero scale values required


This is from running a basic test creating a sphere and using the shelf ‘Explosion’ tool.

Any ideas?
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