Perspective Removal 3D to 2D

Hello! Today, as I saw (Perspective Removal) on the video (

), I immediately started looking for how it can be done. I don’t know how this is done, either in the code or in the shader. The video has (Perspective Removal) it can be changed from 0 to 1 and the models change from perspective to 2D. I found a script I would like to know other options. Preferably a better vertex shader.

o.vertex = mul (UNITY_MATRIX_MV, v.vertex);
o.vertex.z = origin.z;
o.vertex = mul (UNITY_MATRIX_P, o.vertex);```

Thank you!

Hello, is there any news on this topic?