Correct way to achieve Portal Effect

[GabrielTargo]

Hi,

I’m reaching you out to know what is the right way to create a portal effect like Encounters Dinosaurs or Synth Riders :

Synth Riders Gameplay | Apple Vision Pro | Apple Arcade

This is not really documented and i’m struggling a lot …

I see this topic is a little bit relative to this one but there is no clear answer …

Portal Effect

We want to achive portal effect, by having a quad that is a window into our game world. We have tried several approaches now but none have achieved what we need. Here are the things we have done so far. Use stencil to hide the things we don’t want. Result: pink material since it is not supported yet. Do you know if this will be supported soon? Use RenderTexture and Shader that uses Screen Position to display things on the Quad, by following this tutorial https://youtu.be/TkzASwVgnj8?t=7…

And also this one, it mentioned the ARBasicOcclusion, it’s seems to be a way to achieve what i want, but I don’t understand how to use the shader … if someone can explain it to me, it will be awesome !

Stencil Support in PolySpatial

You can create geometry and apply an occlusion shader to it. [Screenshot 2024-03-12 at 5.42.10 PM] [Screenshot 2024-03-12 at 5.42.01 PM] [Screenshot 2024-03-12 at 5.41.39 PM]

Thanks a lot

[DanMillerU3D]

@GabrielTargo

but I don’t understand how to use the shader

You can create a material with the occlusion shader and set that shader to the virtual object that you are using to occlude virtual content. I can put together another small demo to show this off and will post it here in a bit.

[GabrielTargo]

Thanks you very much because I think I’ve done what you are describing, but i’m sure I’m missing something obvious.
I’ll try your demo as soon as possible

[Lexokon]

Hey Dan,
Facing similar issues. I’d love a demo of how to accomplish this. Thank you in advance!

[DanMillerU3D]

Hey @GabrielTargo and @Lexokon sorry about the delay. Try importing this package into a project that has the PolySpatial Package Samples already added.

Portal_AVP_Sample.unitypackage

Here’s a small video of the scene

PortalSample.mp4

How the scene works:

It’s an unbounded scene that has a small 3D scene that is “hidden” behind 4 planes. The 4 planes have an occlusion shader applied to them. I then animate the left and right planes in the outward direction to “reveal” the scene. The planes also have colliders so the virtual objects bounce off the outside of the portal but are able to pass through the inside of the portal.

Hope this helps, I’m working on adding this as a package sample for future releases.

[Lexokon]

Awesome Dan thank you very much for the quick response!

[andnovar8K]

Hello Dan this is a great solution ! I have a question though.

What if you need to do the plane cut across a full scene. Let’s say the occlusion planes are positioned in the middle of the cube. My best guess is to add more geometry to occlude the rest. Is it a different way to not render what is behind the planes ?

Thanks, Andres