Unless I’m setting up something wrong, it seems alpha mask is not supported in GPU for Emissive materials. (first image CPU rendering, 2nd image GPU)
Hello, and thank you for posting this. You are correct, this is a core limitation.
Cannot give any ETA on its solution at the moment, probably the next major release.
Kind regards,
Peter
Is this fixed in V-Ray Next for Sketchup?
Yes, it is. Works well with PNGs. You can try the following:
1. Slot a PNG image file with alpha channel in the Emissive material’s Color map slot.
2. Copy the map and paste it as instance in the Transparency slot, then right-click on it and choose Wrap In > Color Correction.
3. Rewire the Bitmap texture’s channels to receive the desired transparency mask:
Kind regards,
Peter