How to render a mesh effect passing through a vertical plane / portal?

Hi All,

I'm developing a game with magical portals.
I'm looking for a visual effect where a monster passing through the portal is rendered only partially, as it is coming out from another dimension.
So, from a user's perspective s/he wouldn't see the monster if s/he is looking behind the portal but s/he would see it if looking in front of the portal.

Is there a solution for that?

Thanks for your time,
Rod

 

anyone?

 

I'd suggest looking into Stencil Buffer shaders.

The official documentation is a good place to start, although it can lack examples.
https://docs.unity3d.com/Manual/SL-Stencil.html

Here's some more info on the subject:
http://answers.unity3d.com/questions/590800/how-to-cullrender-to-through-a-window.html

These two videos are from the channel "Making stuff look good in videogames":
Stencil buffer:

More advanced stencil buffer:

I hope you'll find what you need