How to mask/clip a mesh

[Leonidas]

I’ve done something similar myself, though not exactly as you draw in your graphic. Using invisible meshes to occlude things that are behind it:

Use occluder model to hide objects

Hi, I would like to use a 3D model to occlude (hide) some other entities/models inside the scene. As the renderer normally does (object behind other object is hidden). But as a last step I would like not to render that occluder. Is this possible?

In your graphic you do a boolean operation where your plane seems to be cutting the box on the intersection point. That I am not sure there is an easy way to do so (without generating a new mesh).