Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: 3daltm on 2023-05-28, 17:18:05

Title: Problem Corona 9.1_ Corona Render AO
Post by: 3daltm on 2023-05-28, 17:18:05

hello,
Its possible to add a invisible plane to make Ambiente oclusion (dirt) on a part of a object (ground) ?
In Corona when i creat a plane invisible do render, de ambiente oclusion dont works. works if enable shadows. I wante ta use this plane to do ambiente oclusion and disable de shadows etc...
in vray work perfectly.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: romullus on 2023-05-28, 19:17:03

Hi,

You can use Corona rayswitcher material - plug physical, or legacy material to its GI slot, leave other slots unpopulated and assign it to the plane that should cast cast occlusion.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: 3daltm on 2023-05-28, 23:24:35

i try but dont work. can you explain better? thank

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: romullus on 2023-05-28, 23:59:07

Sure. Here i used exclusion list in Corona AO, so that only invisible box would cast AO on the teapot. You may include other objects in that list, or use other conditions who should and who shouldn't contribute to AO. Many different configurations are possible. File and screenshot attached.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: 3daltm on 2023-05-29, 10:39:10

im sorry can you save on version max 2020?
sorry
thank you

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: romullus on 2023-05-29, 10:55:40

Sorry, Max 2024 can only save down to Max 2021, but i think my screenshot shows everything that you need to know to recreate the setup. Besides, i think you will learn the principle much better if you have to create the scene by yourself, rather than study one that has been premade by someone else.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: 3daltm on 2023-05-29, 11:07:50

the problam is the  shadows of th invivel plane,i want only a AO, not the shadows contribution.
thanks

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: romullus on 2023-05-29, 11:20:51

I'm not sure if you can do that. Maybe consider using Corona distance instead of AO? Contrary to occlusion, it does not require object to cast GI for the effect to work.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: 3daltm on 2023-05-29, 11:27:12

thank you, corona distance, good idea.

Title: Re: Problem Corona 9.1_ Corona Render AO
Post by: romullus on 2023-05-29, 11:28:26

You're welcome!