Question Crop mesh inside bounds?

Is there a high performing mobile friendly technique that'd crop a mesh inside some bounds set on the material? it's for meshes that might be really near to each other and I want to avoid stencils.

I haven't found anything that avoids the use of clip or discard instructions since these are awful on mobile VR.

 

Well that's a real hard one, the only options left are transparency, but then you get overdraws, or mesh cutting, which move effect to the cpu. There is slice algorithm, you would probably need to apply it every movement update of the object. Another stupid one would be to render object on another overlapping camera, which you would then manipulate the bound, and that would be 2d.