Iray section planes for Blender?

DrGonzo62

Hi,
Is there a funtionality in Blender similar to DS Iray section planes to cut down on render times?
An add-on maybe?

Thanks!

Padone

booleans ?

DrGonzo62

Padone said:

booleans ?

As in per object you want to hide from the renderer?

In DS you just add a section plane and all geometry behind that plane will be hidden from the renderer.
I didn't get far enough into Blender to know if you can do a bool on a collection or not, but I would be surprised if you can.

Padone

Yes you can do collections on booleans, if you just look at the modifier you see the options.

DrGonzo62

The problem for me is, that any mesh lighting gets hidden as well.
So I can no longer just render a section of a scene and composite it afterwards, since the lighting no longer matches.
Something you can easily do in DS.

Wolfwood

As strighforward as section planes i don't know. But a search on the subject pointed me to what appears (haven't tried it) to be a clever way to use geometry nodes to do something similar:

https://blender.stackexchange.com/questions/284371/hide-instances-outside-of-area

 

DrGonzo62

Wolfwood said:

As strighforward as section planes i don't know. But a search on the subject pointed me to what appears (haven't tried it) to be a clever way to use geometry nodes to do something similar:

https://blender.stackexchange.com/questions/284371/hide-instances-outside-of-area

 

Thanks for the feedback.
DS section planes can hide geometry from the Iray render engine, but retain the light emitted by that geometry (clipping lights on or off).
Like part of a ceiling emitting light. You can hide the ceiling, but still keep the light provided by it.