Artifacting

[eyepiz]

Hi All,

I am having some artifacting issues in GPU RT . Has anyone one run into this issue? It's mainly on the floor which is a bit reflective for the result I want. I'm running (3) 680 4GB's GTX's

I would appreciate any advise.

Thanks!

Eric

[vlado]

Which part of the image should I be looking at? I don't see anything particularly wrong with either image (they look identical too).

Best regards,
Vlado

[rivoli]

I guess he's referring to the coloured spots which are most visible on the floor of the first image.

edit:
I ran into the same thing yesterday, sparkling spots around the edges of very bright and glossy reflections, but checking "use 32 bit fb" seemed to solve the problem.

edit 2:
the artefacts are not limited to GPU, as they appear when rendering with CPU too (32 bit fb seems to solve the problem as well).

[vlado]

Ah, those - they are a 3ds Max bug when the Max display gamma state is different from the sRGB button state in the V-Ray frame buffer for the production renderer. As you pointed out, a 32-bit frame buffer solves it.

For future V-Ray builds, we are trying to improve the whole gamma set up a bit.

Best regards,
Vlado

[eyepiz]

Thanks guys!
That solved the issue...one more question since the activeSade uses the max frame buffer when I clone out am image (with 32bit enabled) it changes the gamma (darker). anyway to resolve this?

I'm using gamma 2.2 in the color mapping settings.

Thanks!

[vlado]

What is your 3ds Max display gamma setting? Do you have the V-Ray VFB enabled in the production V-Ray renderer?

Best regards,
Vlado

[eyepiz]

3ds Max display gamma setting is 2.2 and the V-Ray VFB is enabled in the production V-Ray renderer.

What is your 3ds Max display gamma setting? Do you have the V-Ray VFB enabled in the production V-Ray renderer?

Best regards,
Vlado

[vlado]

Ok then; you can try to turn on the sRGB button in the V-Ray VFB and set the color mapping gamma back to 1.0 - this should solve the issue.

Best regards,
Vlado

[eyepiz]

That solved the issue with the production render...RT now displays a darker render in the activeshade.

Ok then; you can try to turn on the sRGB button in the V-Ray VFB and set the color mapping gamma back to 1.0 - this should solve the issue.

Best regards,
Vlado

[tashko.zashev]

Hi,

Can you post a screenshot to see the differences?