solved Create hidden meshes only visible through the mirror

[fsmorygo]

The title says it all. I have a room with PBR walls\floor\ceiling. I have a mirror on the wall and I want to make some object inside the room invisible unless you look at it through a mirror. How can I make this work using BJS?

[JCPalmer]

Perhaps you could use a beforerender , as long a person cannot see the mirror and the mesh at the same time (highly likely, since angle of incidence == angle of reflection). You should probably use a  scene level  beforeRender, because it ALWAYS runs.  Mesh level only run when mesh is going to render.

The beforerender might test if the mirror is inFrustum set the visibility to 0 else 1.

[fsmorygo]

@JCPalmer this won't work unfortunately as the object may still be in the viewport. Imagine you looking in the mirror while holding an apple in your hands. I want the apple to be seen in the mirror but not directly.

[brianzinn]

Here's one way using observables:
https://www.babylonjs-playground.com/#12MKMN#3
 

Another way is to set MirrorTexture activeCamera and use a layer mask.

edit: And welcome to the forum!! ?

[fsmorygo]

@brianzinn thx a lot. Solved that using layer masks.

[Guest]

Flagging as solved