The Firefly Question

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Theo_Gottwald
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Joined: Fri Apr 24, 2020 12:01 pm

The Firefly Question

Post by Theo_Gottwald » Thu Jul 23, 2020 8:23 pm

There seem to be Scenes, where the Fireflies do not go away, no matter how many Samples you throw on them.
The Denoiser removes them later - yes. But ... are there some common Tricks how to avoid them or remove them?
Fireflies.jpg
Example.
Poolballs.blend
(895.23 KiB) Downloaded 16 times
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zeealpal
Posts: 40
Joined: Wed Jan 10, 2018 12:25 pm

Re: The Firefly Question

Post by zeealpal » Fri Jul 24, 2020 4:22 am

Hi Theo,

Basically what your trying to render is called a Specular-Diffuse-Specular (SDS) path. This can't be rendered properly by light tracing or bidirectional (although might tracing may be useful for other areas of a scene). If the lamp has an intersectable area some do get rendered, but that is the noise that you see and doesn't really go away.

As you have ticked, the Caustic Cache with update is how to render this scene, the lower the lookup-radius the sharper the caustics, but the more photons/updates you need to clear the noise.

I would recommend adding a solidify modifier to the container, as well as rendering to .png not an .mp4.

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Theo_Gottwald
Posts: 76
Joined: Fri Apr 24, 2020 12:01 pm

Re: The Firefly Question

Post by Theo_Gottwald » Fri Jul 24, 2020 12:29 pm

Hallo Zeepal, thats a lot for one post.
And you also told me how to get it sharper which would had been my next question otherwise.
I will try that.
Thanks for the answer and the tipps.
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