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Mesh Light / EIS Question

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Mesh Light / EIS Question

Unread postby tom_tm » Sun May 30, 2021 11:55 pm

Hi
while I'm very excited about ML & EIS, I have a question for a render setup.
Sometimes I would like to overexpose the lights. In this case, the visual output of the ML or EIS gets very jaggy on the edges due to the big
difference to neighboring pixels in brightness.

In this case, I would to duplicate the geometry and clamp it's value to something =<1 in brightness to get a smoother visual representation.

Is this the way to go or did I miss something again?

Thanks Tom
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Re: Mesh Light / EIS Question

Unread postby sam » Mon May 31, 2021 7:29 am

Hi there,

You are not missing anything. The jaggies is as you said due to the fact that the emission is super bright. If your sample has a value of 100 and surrounding pixels are around 1, the weighted average of AA will still produce jaggies. The only solution is to somehow reduce the brightness for camera rays (using a texture switch for example). However, even though you'll have the same issue in reflections/transmissions (especially specular ones). Another solution is enabling tone mapping to clamp AA samples above 5 for example. This method is also not ideal because it introduces bias.
clamp5.png
Enable Tone Mapping set to 0.0 0.0 and 5.0 5.0
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Enabled Tone Mapping
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Re: Mesh Light / EIS Question

Unread postby tom_tm » Mon May 31, 2021 10:46 am

Thanks Sam

good to know the trick with tone mapping, I will check it out in my current setup.

Au revoir :-)
Tom
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