Aargh what is this magic?

So I retested it because I get like that sometimes, maybe I can crack this impossible problem, but of course I can't.

Interesting though, that adding edit normal modifier in max fixes some of the errors! How so? Who knows! It must be magic!

here:

from left to right, scanline, shader before edit normals, shader after edit normals.

good old max, the package that keeps on giving!



oh, I think this is the same as undoz posted, sorry!