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Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: YURII on 2018-05-07, 12:53:16

Title: Rendering shadows on separate layer with alpha
Post by: YURII on 2018-05-07, 12:53:16

Hello,

Is it possible to render shadows separately with alpha background?

Thanks!

Title: Re: Rendering shadows on separate layer with alpha
Post by: YURII on 2018-05-07, 16:00:26

Anyone?

Title: Re: Rendering shadows on separate layer with alpha
Post by: Gruender on 2018-05-07, 19:47:51

You can use the shadow pass, it includes all shadowa in the scene.
Don‘t if that is what you are Loopings for...

What do you need this pass for?

Title: Re: Rendering shadows on separate layer with alpha
Post by: YURII on 2018-05-07, 21:20:08

Quote from: Gruender on 2018-05-07, 19:47:51

You can use the shadow pass, it includes all shadowa in the scene.
Don‘t if that is what you are Loopings for...

What do you need this pass for?

I need it for compositing later in PS. The thing is, I dont need the bacground, main item and its shadow only. Is it possible to do with shadow catcher material somehow?

Title: Re: Rendering shadows on separate layer with alpha
Post by: Gruender on 2018-05-07, 21:30:35

Sure, that is what the shadow Catcher was made for!

Title: Re: Rendering shadows on separate layer with alpha
Post by: Beanzvision on 2018-05-07, 22:23:16

Apply the shadow catcher to what you want removed and change its mode to for compositing. I'm not at my PC so perhaps my answer on this thread will help.
https://forum.corona-renderer.com/index.php?topic=19611.0

Title: Re: Rendering shadows on separate layer with alpha
Post by: YURII on 2018-05-08, 09:18:40

Quote from: beanzvision on 2018-05-07, 22:23:16

Apply the shadow catcher to what you want removed and change its mode to for compositing. I'm not at my PC so perhaps my answer on this thread will help.
https://forum.corona-renderer.com/index.php?topic=19611.0

Thank you, it is working now the way I wanted it to work! Only thing is, it is producing shadows with great noise even after like 200 passes (see image attached). Is it known issue? Or it could be something on my end?

Title: Re: Rendering shadows on separate layer with alpha
Post by: Gruender on 2018-05-08, 09:29:38

I saw the same noisy effect in all render engines I used when rendering matte shadow, maybe denoising will help.

Title: Re: Rendering shadows on separate layer with alpha
Post by: YURII on 2018-05-08, 09:33:49

Quote from: Gruender on 2018-05-08, 09:29:38

I saw the same noisy effect in all render engines I used when rendering matte shadow, maybe denoising will help.

No, denoising does nothing, produces result like this (see image)

Title: Re: Rendering shadows on separate layer with alpha
Post by: Beanzvision on 2018-05-08, 10:11:28

Do you have denoise activated in the shadow pass?