Function intersection_solid 

pub fn intersection_solid(a: &Mesh, b: &Mesh) -> IntersectionSolid

The intersection solid of two world-space meshes, or an honest reason there is none.

Both operands must already be in the common world frame: for a federated pair the models’ placements must be baked into positions before the call. This function applies no transform and has no way to detect a missing one.

Costs one exact boolean of the two meshes; see the module docs for why the result is gated rather than returned raw.