Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] I need help! => Topic started by: koubankeo on 2020-02-05, 10:37:25

Title: sky background
Post by: koubankeo on 2020-02-05, 10:37:25

Hi coronauts,

what is the right way to set the background, eg sky background?

If I create a C4D sky object and apply material- in the diffuse HDRI map slot from hdrihaven (standard or light without emit light), the sky is faded, hardly visible.

If I apply the same material in render sett./ scene environment overrides, the sky looks beautiful. The problem is that it causes white dots that only disappear with denoising amount 1!

Is it a bug, or am I doing things wrong?

please for quick help

thanks

Title: Re: sky background
Post by: Beanzvision on 2020-02-05, 11:05:15

Hi there,

It sounds like you may be doing things incorrectly. All you should need is the Corona sky object, from the "type" dropdown choose "Shader/HDRI" and then load your HDRI there. Never load an HDRI via the diffuse channel.

(https://forum.corona-renderer.com/index.php?action=dlattach;topic=27803.0;attach=119250;image)

Title: Re: sky background
Post by: houska on 2020-02-05, 11:06:47

Hi, this is strange, I just tried it and have the same result with (left) Corona Light material in environment override and (right) HDRI bitmap placed into the Shader/HDRI slot in the Corona Sky. See the attached picture.

What HDRI are you using? Maybe the issues are related to that specific file (especially the fireflies).

Otherwise, both options - env. override and Corona Sky - should be equivalent.

Title: Re: sky background
Post by: koubankeo on 2020-02-05, 11:24:50

Thank you for the quick reply.

beanzvision: this is the case for HDRI lighting.
I want to use the corona sky + sun and put only the sky in the background.

here is a comparison

Title: Re: sky background
Post by: houska on 2020-02-05, 15:16:25

If you use sky + Corona Sky, they will be added together. That's why the first picture is so bright. So maybe to fix that, you should use Corona compositing tag with everything except "seen by GI" and "cast shadows" disabled?

 I don't wee any issues otherwise.

Title: Re: sky background
Post by: koubankeo on 2020-02-05, 15:41:07

Quote from: houska on 2020-02-05, 15:16:25

If you use sky + Corona Sky, they will be added together. That's why the first picture is so bright. So maybe to fix that, you should use Corona compositing tag with everything except "seen by GI" and "cast shadows" disabled?

 I don't wee any issues otherwise.

Of course, I did it wrong. Corona Tag to Corona Sky.

thank you houska :)