VRay Illuminance render element problem

V-Ray V-Ray Common Public
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1

Hi everyone,

I’m wondering how VRayIlluminance render element works. I can see it gives me a range of lux values displayed as a color diagram projected onto the model.
However, my problem is that if I modify my exposure settings of my camera, the diagram’s colors change as well, which would mean the lux values have increased or decreased.
As far as i know, lux values should not depend on the exposure, but only on the intensity of the light sources.
So my question is, on what exposure value should i render to get realistic lux values, or what is the correct way to use this render element?

Thank you,
Gábor

2

Apparently 3ds max Physical Camera Exposure control affects the VRayIlluminance render element brightness. I’ve reported the issue in our bug tracking system.
For now use VRay Exposure Control instead.

3

Dear ChaosGroup,
With VRay Exposure Control the element works just fine as said.
Thank you very much for your quick response!
Gábor