Volumetric mask in mental ray?

[Anonymous]

Hi everyone!

I'm need to know how to create a few masks.

I need to re-render my animation (animated objects and camera) but that will take too long but  I had to change something in my objects but my camera path is the same.

I want to mask my objects (like inside of a sphere) and then only render it in order to see the new animation and how it will affect the environment around it.

I know that you can do it in Vray very easy with something called vray sphere fade (image attached) but im rendering in mental ray

 

[irishman_team_kilber]

there are so many ways of doing this by using a volume light, fog effect and with a mental ray Volume Shading

mental ray Volume Shading

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMa...

fog effect

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMa...

volume light

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/3DSMa...

these are just example link

[Francisco_Penaloza]

Well, actually Mental Ray has the option to render only the selected object.  You'll have to create a separate shadow mat pass or re render the floor too in case you have reflections on it.