I think the problem isn’t that specular tracing is on, it’s that the entire mesh is ignored when only one material slot is translucent.
In the third picture : https://forums.unrealengine/community/general-discussion/24447-nvidia-gameworks-integration/page287 the Opaque material slots are recognized by VXGI, but one material slot (the top of the table) is ignored. That’s the “correct” behavior I would expect.
In the second picture, the WHOLE mesh is ignored, even though only one material slot should be ignored. Both pictures have specular tracing enabled. And the Opaque materials are identical in both pictures.
The reflection in the second picture should look like the reflection in the third picture, but it’s not. seems like a bug or at least unexpected behavior. I was wondering if it’s user error, like maybe there are some material settings or VXGI settings that would make it behave “correctly”?