Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: the ando on 2022-04-24, 14:46:58

Title: alpha for png
Post by: the ando on 2022-04-24, 14:46:58

hi guys,
i have rendered few png sequences but forgot to check the alpha Chanel so there is no alpha. is there any way to render only  all the alpha ?
got glass transparency i have to see so mask dont work i have to render the alpha
thanks,
Oren     

Title: Re: alpha for png
Post by: burnin on 2022-04-25, 00:46:22

must shade then,
in which case your best next thing is to:
- override with most simple material,
- Preserve Glass,
- set GI mode to Single bounce 
and also lit as simple as possible

Title: Re: alpha for png
Post by: the ando on 2022-04-25, 12:33:28

will try it

Title: Re: alpha for png
Post by: NicolasC on 2022-04-25, 14:13:55

Hello,

Try CShading_Alpha Render Element + "Render Only Masks" render setting (Scene Tab / General Settings / Render Overrides section).

Title: Re: alpha for png
Post by: burnin on 2022-04-25, 18:00:14

Ah, yes...  could be w/ 3DS Max.

I was explaining "how to" in C4D.
 

Title: Re: alpha for png
Post by: romullus on 2022-04-25, 19:08:34

It's not 3ds Max specific thing, it's the same in both host softwares. As CShading_Alpha name suggests, alpha is shading element, so disabling shading will not work. Following Burning's suggestions is a good way to safe some render time, but unfortunately there's no cheap way to render only alpha channel, you still need to render full scene, so next time take extra caution to save every bit of information that you think might be useful.

Title: Re: alpha for png
Post by: NicolasC on 2022-04-25, 20:41:31

Quote from: romullus on 2022-04-25, 19:08:34

As CShading_Alpha name suggests, alpha is shading element, so disabling shading will not work.

My bad - answered too quickly indeed ;)

Title: Re: alpha for png
Post by: Pedro Torres on 2023-10-10, 02:10:57

Quote from: romullus on 2022-04-25, 19:08:34

It's not 3ds Max specific thing, it's the same in both host softwares. As CShading_Alpha name suggests, alpha is shading element, so disabling shading will not work. Following Burning's suggestions is a good way to safe some render time, but unfortunately there's no cheap way to render only alpha channel, you still need to render full scene, so next time take extra caution to save every bit of information that you think might be useful.

What if you select everything and add it as a mask?