Potential Bug with V-Ray for Maya: GI Pass Black with Camera Image Plane

[Stirk]

The issue I’m having is that the GI pass does not render properly when using a camera image plane. The final RGB image is fine as is Total Light pass, but the GI pass on its own is almost black. If you delete the image plane, then it works just fine. Even if the image plane alpha is set to 0, thus making the background invisible, the problem persists.

Here are the results when using a camera image plane:

Correct RGB Image:

Correct TotalLight pass:


Incorrect GI pass:


And here the GI pass is correct when *not* using a camera image plane:


I have attached a simplified version of the scene to demonstrate the issue further.
GI_Issue.zip (1.11 MB)

[hermit.crab]

Thanks for the provided scene. It seems the image plane blocks the GI generated from the VRaySky. I’ve logged the issue (internal bug-tracker id: VMAYA-9763) for developer analysis. A workaround may be to use the Background override (Overrides>Environment>Background texture) instead, where the plugged image is mapped in Screen space.

[Stirk]

Okay, thanks for the suggestion.