I can never get beauty Passes to work. Currently coming in over exposed and different

[KeithM12]

Currently struggling to get a BackToBeauty to work. Following this page currently - https://docs.chaos.com/display/VMAX/VRayBackToBeauty

Can someone please explain why both images look different.

i thought it might be the gamma and color mapping but that's all on default settings the best that I can see.

[KeithM12]

Another test to see if it was the scene itself but still having the same result. I'm obviously doing something fundamentally wrong.

[KeithM12]

Well it seems working in 16 bit TIFFs is going to get me some unwanted results so I've switched to 32 bit EXR and 32 bit targa files. It still produces small changes in the render but it's definitely closer.

[KeithM12]

Seems even within Vray there's some differences when compositing. See the bricks on right hand side for difference in lighting.

[hermit.crab]

Quoting the docs: "When selecting the Affect All channels option of VRayMtl/VRayToonMtl, be aware that the information of the respective component will affect all render elements, therefore the Back to Beauty composition will not match the RGB result from the renderer." Maybe this is happening?

[KeithM12]

Hi,

It seems it was a combination of affect all channels and Legacy lights in the scene. Thanks for the reply.