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VrayLightMtl on railclone objects - not emitting light properly.

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RG1597:
VrayLightMtl produces unexpected results when applied to a Railclone object.

The firest file is the railclone object inside another one (spheres inside each room of a building)
The second is normal spheres instanced inside the rooms (railclone) with the same material applied.

Vray 5 3DSMax 2021.

Is this known behaviour? If so it's a real shame as it wouldn't allow material workflow for variable lighting inside buildings.

RG1597:
Ok, nevermind, it works going through the VrayMtl self illumination slot

IT1371:
I experience the same issue, but with a twist.
Oddly, VrayLightMtl produces a desired effect when rendering with Vray IPR, but when switching to production render it doesn't work anymore.
Almost feel seems like Direct Illumination doesn't work anymore (like its in a multisub), since the RC object still glowing but won't light up a room.

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