Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] I need help! => Topic started by: NOOKTA on 2021-01-28, 10:19:34

Title: Issue with glass reflection/refraction and corona light
Post by: NOOKTA on 2021-01-28, 10:19:34

Hello everybody,

stumbled upon a issue that I couldn't solve on my own or with the forum search.

Corona lights appear black in glass reflection/refraction. With thin glass it works in the refraction, but with thick glass is doesn't work in either. I'll explain my snapshots, I also attached the scene.

• purple is a corona light
• yellow is a reflection of purple
• orange is a corona light behind glass

What I did so far:

• check normals
• check/uncheck different light settings
• cube has a thickness of 2cm
• it works when the corona light type is changed to object
• something weird happens when changed to sector
• light shape doesn't affect issue
• tried the latest daily build (7.0 daily Jan 22 2021)

Anybody has an idea how to fix this? My goal is to have it work with thick glass.

Best,

Ararat

Title: Re: Issue with glass reflection/refraction and corona light
Post by: Beanzvision on 2021-01-28, 10:59:38

Hi, Sounds like a directionality issue. Can you try setting the directionality of the lights to 40% instead of 54%? It's a workaround but it seems to do the trick for now.

Title: Re: Issue with glass reflection/refraction and corona light
Post by: NOOKTA on 2021-01-28, 11:15:42

Hi beanz,

thanks for the quick reply. You are right, I attached another snapshot showing something interesting, that might help solve this issue. At 47% the effect gradually kicks in, I guess depending on the viewing angle?

I can go with 40% for now, but would be great to have fixed in the future.

Thanks,
Ararat

Title: Re: Issue with glass reflection/refraction and corona light
Post by: Beanzvision on 2021-01-28, 11:19:33

Hi, Thanks for confirming. I'm in the process of adding this to our internal bug reports and no doubt we will investigate further.
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