Rhino unable to produce a good mesh from xyz file


I have a big 2.5D xyz point file (topo data). I apply Mesh Patch and what I’ve got:
Here is what is wrong with this mesh:
Mesh has 6 pairs of faces that intersect each other. Intersecting faces can cause problems if you’re doing mesh boolean operations with them.
Why does it happen? Is there no way to find these intersecting faces?

Hello - In V6 no- if you run the V7/WIP, MeshIntersect, with only one mesh selected, will mark sel-intersections.


Thank you. And again it is better to use a chain of a few smaller applications instead of one big.
Anyway, Rhino 6 uses a wrong algoritm to solve this task.