Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: 3dwannab on 2015-02-10, 19:12:04

Title: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: 3dwannab on 2015-02-10, 19:12:04

See image of asset I'm working on. I can't see anyone else reporting this issue. I did see one thread but it's marked as inactive. Found: https://forum.corona-renderer.com/index.php/topic,2619.msg19883.html#msg19883 (https://forum.corona-renderer.com/index.php/topic,2619.msg19883.html#msg19883)

This issue becomes more troublesome the closer you get to the objects corners. I can send a max file to https://corona-renderer.com/upload/ (https://corona-renderer.com/upload/) for a test scene. The reflection pass is where the trouble lies.

BTW What is the preferred maximum for the samples for round corners?

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: romullus on 2015-02-10, 20:54:55

I'm avoiding to use rounded corner feature on materials with high specularity, because it's really hard to get rid of fireflies otherwise.

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: 3dwannab on 2015-02-10, 23:04:42

Albedo is at 186RGB at those corners. Kinda strange this is happening.

I'll go with your method. Thanks.

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: Ondra on 2015-02-13, 20:37:29

Do you still think there is a bug? Rounded corners will be probably always very noisy for highly specular materials, because of the way they are computed.

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: 3dwannab on 2015-02-16, 22:49:32

No, just a bug with the rounded corners on highly specular mats regardless of the amount of samples used. I have tried 99 in my testing with tessilated mesh and still got issues. Do you want this scene to test with?

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: Ondra on 2015-02-16, 22:52:20

no... this is just limitation of the rounded corners method used - it produces noisy normals, that will cause problems with mirror materials.

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: Ondra on 2015-02-16, 22:54:35

I added it here: https://corona-renderer.com/wiki/troubleshooting

Title: Re: Fireflies on rounded corners (Tessellated mesh and up'd corner samples to 25)
Post by: 3dwannab on 2015-02-17, 21:49:53

Thanks for clarifying this. Thank goodness for the chamfer modifier :]