Auto exposure issue

[seandunderdale]

Hey guys,

I keep getting this error even when I am rendering with all cameras on and auto exposure on. Also light cache is on. Any ideas?

Maya 2018. Vray Next update 2.1 (4.30.01)

[seandunderdale]

The shot is correctly exposed by the auto exposure during the render, but throws that error up when I try to copy settings to the camera.

[hermit.crab]

It seems to be working fine with the said versions. Do your cameras have a 'physical camera' V-Ray attribute? Does this happen on a specific scene? Could you attach it here?

[seandunderdale]

Ive got physical camera on. It worked when I first installed Next ages ago, but in recent months its never copied over. Ill see what happens on a fresh scene and if it is still an issue Ill send it over. Probably just need to delete maya prefs as usual...

[seandunderdale]

Ok Ive worked out whats happening, and how to fix it. If I open a new scene, make a plane, a sphere, a dome / hdri and a camera. Enable physical cam. CUDA mode with Light cache and auto exp on.

If I render and try to transfer cam settings it errors. If I switch to CPU, re-render and try, it works. Then if I switch back to cuda AFTER it working in CPU mode, it also continues to work. So it seems I have to render in CPU mode before CUDA mode will work.

[hermit.crab]

Yes, you are right. The issue is already logged (internal bug-tracker id: VMAYA-8052) for developer analysis. I'll give it a priority bump. For now, the mentioned workaround should suffice.