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Lighting night scenes without fireflies.

bashrag_7b41cbcd6dbashrag_7b41cbcd6d Posts: 71
in Daz Studio Discussion

I'm having trouble with this scene. It's using a 2k HDRI file of Shanghai at night as the primary light source with two other geometric lights above and behind the figure. The problem is that I can't get rid of the damn fireflies. They are bad on the bar itself. but are all over the character as well. 

If I just use the sun & sky preset I have no such problems but then the scene is overly lit. 

I could turn on the firefly filter but in my experience that just makes the scene blurry.

So I guess what I need is some advice on lighting a night scene without having to render it for a million years to get rid of fireflies. Does anybody have any advice?

BarFireflies.png
1920 x 1080 - 3M

Comments

  • skinklizzardskinklizzard Posts: 218

    as far as I know grainy render from iray convergence taking its sweet time is not the same thing as fireflies, but that aside seeing as you mentioned you didn't want to wait it out, you could try boosting the light values of everything in the scene (including the HDRI) and then tone map it back to acceptable levels.

    Iray tends to run faster/less grainy with more light I believe, over lighting and tone mapping might give you other issues as I'm not sure how well that'll do for reflections or sub surface glows.

    alternatively you could over light use canvases and tone map/comp the scene in post.

  • superlativecgsuperlativecg Posts: 140

    I'm having the same problem too.  Using the denoise filters help a bit.

  • bashrag_7b41cbcd6dbashrag_7b41cbcd6d Posts: 71
    skinklizzard said:

    as far as I know grainy render from iray convergence taking its sweet time is not the same thing as fireflies, but that aside seeing as you mentioned you didn't want to wait it out, you could try boosting the light values of everything in the scene (including the HDRI) and then tone map it back to acceptable levels.

    Iray tends to run faster/less grainy with more light I believe, over lighting and tone mapping might give you other issues as I'm not sure how well that'll do for reflections or sub surface glows.

    alternatively you could over light use canvases and tone map/comp the scene in post.

    Thanks for the detailed reply. I decided to render it at a 2x size and then shrink it down. That seems to have worked well.

    However I'm going to be rendering more night scenes so I'll keep your tips in mind.

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