Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: brr on 2025-07-22, 09:21:25

Title: Render only masks (disable shading) does not work anymore?
Post by: brr on 2025-07-22, 09:21:25
Hello Corona-team,
I haven’t used the brilliant "Render only masks (disable shading)" option in several recent Corona versions, but I needed it for a project recently. Has something changed? Am I missing something ? When I activate it, all my masks turn completely white.

I tested this with the alpha mask in Corona 12.2 and 13, using a completely blank scene with default settings - only the max background color was changed.

Please take a look at my attached video.
Title: Re: Render only masks (disable shading) does not work anymore?
Post by: romullus on 2025-07-22, 09:56:47
Counterintuitively alpha is a shading pass, so it will not render when render only masks is enabled. Try to add some non-shading elements and it should work fine.
Title: Re: Render only masks (disable shading) does not work anymore?
Post by: brr on 2025-07-22, 10:55:48
Counterintuitively alpha is a shading pass, so it will not render when render only masks is enabled. Try to add some non-shading elements and it should work fine.

Oh wow! Thank you for the information. Indeed, it is very counterintuitive, because alpha is always perceived as a simple mask by users. Now I understand why it has the CShading prefix.
I think the topic can be closed - there is no issue here. False alarm. Sorry!
Title: Re: Render only masks (disable shading) does not work anymore?
Post by: romullus on 2025-07-22, 12:02:46
Yeah, i always get caught on this too :] I'm moving the topic to resolved board then.