Arnold mesh light and AtmosphereVolume gives fireflies

[jimKUQZ5]

I have a super simple scene that gives me tons of fireflies:

How to get rid of them?

These are the steps to recreate the scene:

- Create a Sphere, Scale it down to '0.01'
- Create a mesh light from the sphere, Exposure to 5, Toggle Light Visible
- Create an AtmosphereVolume, Set density to 0.1.
- Zoom out a bit and tons of fireflies.

[lee_griggs]

Mesh lights are more prone to noise. You are best off using a point light in a situation like this.

You could also try increasing the number of atmosphere_volume samples, mesh_light samples, and camera(aa) samples.

[jimKUQZ5]

The above example is the simplest scene I can come up with to recreate the problem. My production scene uses more complex geometry that can't be easly recreated with pointlights.

The weird thing is increasing samples gives me more fireflies!

- 20 Aa Samples
- 10 aiAtmosphereVolume Samples
- 5 Mesh light Samples

In my opinion the above settings are on the expensive side.

Hope there is another fix for this.. Mesh lights are extremly usefull 🙂

[lee_griggs]

Can you post your atmosphere_volume settings? A simple scene would also be useful.

[jimKUQZ5]

Here are the atmosphere_volume Settings:

[jimKUQZ5]

I am not allowed to upload a Maya (.mb) file here 😞

[lee_griggs]

Upload it elsewhere and post the link here.

[jimKUQZ5]

https://we.tl/t-dIEu88ZVA7

[lee_griggs]

I created it through the Arnold menu and you can see there are no fireflies.

When I scale it down I can reproduce the issue.

Will create a ticket. Thanks for the feedback.

[jimKUQZ5]

Thanks, how can I keep track of the ticket?

I also noticed that the problem is amplified when adding more polygons/subdivs to the mesh

[lee_griggs]

>I also noticed that the problem is amplified when adding more polygons/subdivs to the mesh

Added to the ticket. The tickets are private, but you can keep track of future release notes here:

https://docs.arnoldrenderer.com/display/A5AFMUG/Release+Notes

[jimKUQZ5]

Allright will do, thanks for your time and help!

Looking forward to new Arnold versions 🙂

[spatton8DRBC]

im having the same issue in C4DtoA