"Direct Illumination" on V-Ray LightMtl and RTX/CUDA

[Marcus_C]

Hi,

The "Direct Illumination" option on the V-RayLight Material don't seem to have any effect(renders material black) when using the RTX or the CUDA engine.
It seems to work fine on the CPU engine.
(vray_adv_60021_houdini19.5.435)

[chakarov]

Seems to work on my end. Is this the official V-Ray 6 build ? Can you share simple scene?

[Marcus_C]

Seems to work on my end. Is this the official V-Ray 6 build ? Can you share simple scene?

Hi,

Yes it's a offical V-Ray 6 build, however the issue was due to the geometry being (Packed Alembic), which the CPU engine/mode supports but not the RTX/CUDA engines.

Also noticed that the "Direct Illumination" option on the material only works if the material is assigned directly on a geometry node in the "Objects" context, not if the shader is assigned inside a geometry node. But there are workarounds for both situations of course...