What's happening ? Vray light 200 times brighter in RT

V-Ray GPU V-Ray GPU :: Issues
1

I don’t know what’s happening, but RT works fine with sun n sky, then when I switch to a model with VRayLights or Spots etc. I have to adjust the Physical camera to 200x slower (longer exposure) to get approx the same result in render than I have in RT.

Like if Exposure was OFF in RT for those lights… I’ve certainly done something wrong but does someone has the same problem and fixed it ?

Tested on various scenes, with artifical & natural only and mixed… same problem again and again.

(It’s not related to gamma, legacy sun/sky/cam is OFF)

2

Made a quik test and my intuition was correct :

Camera exposure OFF : returns the same result

3

Is it possible that you are using light include/exclude lists and this causes the difference?

In any case, would it be possible to send me a simplified version of your scene to vlado@chaosgroup.com?

Best regards,
Vlado

4

Thanks to Vlado, error was solved.

“Use 3dsmax photometric scale” has to be checked in the global switch rollout for the final rendering to match the RT window