Unity: Hide material in specific area

Question

I am making a 3D application for ios and Android.

Each object in the below image has a different material than others.

I want to make the part of object 3 that intersects with object 2 appears and the part that intersects with object 1 disappears.

Notes:

Object 3 is moving up and down.

The 3 objects have the same depth from the camera (same z).

What do you mean by "part of object x" ? Geometry ? Sub objects ? — Eric, Oct 08 '19 at 10:55
Do you have and example for something similar to what I am searching for? — MBS, Oct 08 '19 at 11:47
I made something in that area using shaders. This should point you in a direction: https://www.ronja-tutorials.com/2018/08/06/plane-clipping.html. — aalmigthy, Oct 08 '19 at 15:19
Are you using Sprites or 3D-Models? When using Sprites have a look at [SpriteMasks](https://docs.unity3d.com/Manual/class-SpriteMask.html) — aalmigthy, Oct 08 '19 at 15:41

Dimitar · Answer 1 · 2020-11-06T23:37:43.043

You will have to write your own shaders in Unity's ShaderLab using Cg/HLSL and use stencil buffers. Unity's manual gives you the basics, while a good practical introduction can be found here.

In short, stencils allow you to enable/disable rending in the clip space, based on reference values of other shader passes. A caveat is that the values are global and all shaders can read and write in the buffer, so you should carefully choose a reference value.

Unity: Hide material in specific area

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