MultiMatte does not work with transparency - VRay 5 1.3 3DSMax 2021

[CLF73]

Hi there
Is it a known issue that Multimatte doens't work with transparency when GPU rendering?
Is there an easy workaround or a fix in the pipeline?

See pictures and sample scene attachment for details.

Settings and material.



Rendering problem

[nikoleta.garkova]

Hey CLF73,

Sorry to say this is not yet supported in GPU.

A way to workaround this is to make a selection set with all the glazed objects and disable the 'Visible to camera' option in the object settings. This will require making a second render, but you can disable the maps/displacement to speed things up. You could also decrease the samples limit, depending on the complexity of your scene. Alternatively, you can use the 'Affect all channels' option in CPU mode.

I'll add this thread to our internal request and try to raise its priority additionally (ID number: VGPU-826). Apologies for the inconvenience.