Question Occlusion object in MARS rules

Hi all,
I see that it's possible to include a mesh that acts as an occluding object. Say off the first marker image for example.
How does one set this up? Is there docs for this?

 

What I'm hoping to do is to replicate what we saw in the MARS Rules webinar.
I've got a mesh that is the same dimensions as the interior walls of my flat.
I'd like to designate as an occluder, so that objects in the bathroom can not be seen through the walls from the hallway.
The virtual model of the flat would ideally act as an occluder, ensuring that things on the other sides of walls are not visible.
So I can create a proxy object, call it "Node Bathroom".
Create a rule that creates a cube on every Node Bathroom.
Then, when playing the scene, the cube that is spawned on the Node Bathroom is only visible when one is in the bathroom.

Is this possible?

My current attempts at this have the cube drawing in front of the walls all the time, so nothing is occluded.




In the image, the red arrow is the wall, and the area of the cube we see at the blue arrow should be occluded behind the wall.