Fire sss doesn't match final render.

Fire sss doesn't match final render.#384220

By Gary Bidwell - Tue Dec 02, 2014 5:21 pm

- Tue Dec 02, 2014 5:21 pm #384220

My sss white plastic render looks great in Fire rendered at 2k, but when I send to Maxwell Render at 6k sss shader looks much more translucent and much darker. Do I need to compensate for the increased resolution? i.e. is the sss effect resolution dependent? or is this a Fire problem/limitation? I don't expect them to be identical but at least in the same ball park.

Thanks.

Re: Fire sss doesn't match final render.#384223

By seghier - Tue Dec 02, 2014 5:53 pm

- Tue Dec 02, 2014 5:53 pm #384223

i never see right sss in fire
test it in render viewport than render it

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Re: Fire sss doesn't match final render.#384225

By Gary Bidwell - Tue Dec 02, 2014 7:33 pm

- Tue Dec 02, 2014 7:33 pm #384225

Test it in the render viewport? Do you mean send in to Maxwell render?

Re: Fire sss doesn't match final render.#384226

By seghier - Tue Dec 02, 2014 7:45 pm

- Tue Dec 02, 2014 7:45 pm #384226

render viewport inside studio

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Re: Fire sss doesn't match final render.#384242

By Fernando Tella - Wed Dec 03, 2014 2:32 am

- Wed Dec 03, 2014 2:32 am #384242

As far as I know FIRE engine is optimized for fast previews. I don't think sss is a priority for it and may not be completely accurate for specially complex light calculations like sss or caustics.

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Re: Fire sss doesn't match final render.#384268

By Mihai - Wed Dec 03, 2014 6:32 pm

- Wed Dec 03, 2014 6:32 pm #384268

At what SL of the production renderer are you judging this? The final look of SSS can change a lot especially during the first 10 SLs or so.

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Re: Fire sss doesn't match final render.#384284

By Gary Bidwell - Thu Dec 04, 2014 10:09 am

- Thu Dec 04, 2014 10:09 am #384284

I'm comparing looks at around 10-12 sl. I have now managed to match the result in Fire by tripling my coefficient and saturating my attenuation and scattering colours. However it would be nice to use Fire for balancing all lights and shaders confident that when you send these to render you get the same result even for SSS.

http://youtu.be/k1DKFskGHvg

With Maxwell 3.1 around the corner I would say this is even more important now. Have any improvements been made to Fire to allow fine tuning of SSS or skin SSS? If not maybe a Fire option to prioritise SSS when working in a heavy SSS workflow would be preferable.

Re: Fire sss doesn't match final render.#384639

By tom - Mon Dec 22, 2014 5:47 pm

- Mon Dec 22, 2014 5:47 pm #384639

What you see in Renderman video is not the same SSS approach with Maxwell's. So, it can give predictable results in early samples. Maxwell is using a very expensive computation which can only converge in late samples. On the other hand, we are working on a dedicated multilayer skin approach which would give similar results.

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