Hi Michael,

Still at my job here so I did a quick reading, but isn't the kind of artifact also visible when the famous 'centroid' option is on . I remember having this kind of shading errors when exporting triangles mesh for octane, and you told me to disable the centroid options in the .ini files, ... it completely fix the problem indeed.

http://moi3d.com/forum/index.php?webtag=MOI&msg=3386.24

(EDIT - tweaked the link - the one here was accidentally a link to the message reply button)