How to cut a part of mesh?

You can either use the Voronoi fracture method or just the UV map masking.

First is using GPGPU as I know and you need to generate your mesh’s fracture in a texture ( Literally a Voronoi Diagram. ) It’s physics and very expensive even though with GPGPU parallel calculation.

Second is you need to figure it out that scan object’s collision vector location,
then you need to make that vector value into the source’s object’s UV map.
As I know the Planar , Cylindrical calculation is on the Market place also, but that’s kind of a Sci-Fi Dissolve effect with the emmissive light, that means it just disappear and not making cutting effect if you’re trying to make some gore effect that like a dismemberment of the body anatomy.