fireflies with IBL lighting and metal/glass surfaces

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cmacks
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Joined: Wed Mar 09, 2016 4:35 pm

fireflies with IBL lighting and metal/glass surfaces

Postby cmacks » Tue Aug 08, 2017 4:49 pm

Generally I get good results using IBL lighting and Reality. One limitation is that I tend to get what I think are fireflies on skin (e.g. G3F) near metallic jewelry or shiny objects like sunglasses. I think they are fireflies because they get worse with rendering time, not better. Any suggestions in reducing/eliminating these? Thanks.

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sigstan
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Location: Denmark

Re: fireflies with IBL lighting and metal/glass surfaces

Postby sigstan » Sun Aug 20, 2017 4:13 pm

Unless IBL has "hot pixels" metal should not normally be an issue. Can you show us an example picture?
/Sigstan

cmacks
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby cmacks » Wed Aug 23, 2017 2:21 am

Here are two (from the same render). Shiny gold earrings. The rest of the render was quite "done".
noise2.png
noise2.png (70.21 KiB) Viewed 9875 times
noise1.png
noise1.png (95.55 KiB) Viewed 9875 times

Gederix
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby Gederix » Wed Aug 23, 2017 7:19 am

If there are bump/normals/displacement maps for the hoops try dialing them down or removing them.

cmacks
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby cmacks » Wed Aug 23, 2017 10:09 am

I will try that, thanks.

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sigstan
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby sigstan » Sun Aug 27, 2017 2:48 am

It does look at bit odd.

Let us know, if Gederix's advice helps. - Otherwise I think we need to see scene configuration tab and output tab. Also IBL name and render time at the point you are showing.
/Sigstan

cmacks
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby cmacks » Sun Sep 24, 2017 11:42 pm

Playing more, this seems to be a problem with Sobol, and is mostly not a problem with Metropolis. Does this sound right?

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sigstan
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby sigstan » Wed Sep 27, 2017 3:12 pm

/Sigstan

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fuzzy70
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Re: fireflies with IBL lighting and metal/glass surfaces

Postby fuzzy70 » Thu Sep 28, 2017 12:58 pm

Are they fireflies or could they be caustics???, caustics does happen on metal and not just glass/liquids as a lot of people think. As Gederix said removing any bump/normal/displacement maps may help, also geometry resolution but normally only on very low poly items with sharp changes in edges.

If they are caustics there is very little you can do due to Lux being fully physics based other than toning down the reflectivity of the material so it's not so mirror like. Caustics are more pronounced where there is another object in close proximity (which seems the case in your 2 examples) and only way to minimise their effect is put more space between the reflective objects and their surrounding objects, which is not always possible though.

Regards

Lee
Windows 10 x64, Daz Studio 4.9 x64, Poser Pro 11 & whatever the current version of Reality is :lol:


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