Hi Jacob, occasionally Modo has problems dealing with n-gons, particularly ones that have a lot of colinear points in them like there probably is in that one particular quad-like one that you indicate.
A couple of things to try - first thing is to use LWO format for the transfer into Modo rather than FBX. LWO is the closest to Modo's own native structure and so it tends to do less messing around with the import. N-gons can often times transfer better into Modo using LWO format. Partly that's because Modo is sensitive to which particular vertex is set up as the first vertex in the face, and if it's set to a vertex that has 2 colinear edges coming out from it, it can get a messed up face normal since it only tries to determine the face normal by using just the first vertex and its surrounding edges rather than looking at the entire polygon.
MoI sets the first vertex with particular care when exporting to LWO format, when you use FBX or OBJ format you're relying on Modo's importer to do that job and it does not always get the best one to use as the first vertex.
So anyway just using LWO format may solve your problem. If it doesn't then the next thing to try is to use "Output: Quads & Triangles" for that particular problematic piece rather than "Output: N-gons". You'll lose the n-gon structure of course, but it's likely that it's some problem in Modo's n-gon handling that is causing the problem that you see so not using n-gons can be the solution.
If the problem persists, it could be possible that the trim boundaries on the NURBS model itself are messed up and need to be repaired. But usually if that's the case you would see things looking messed up at the export screen inside of MoI as well instead of only when imported into Modo.
Hope this gives you some things to try, the easiest to start with is to just use LWO format rather than FBX. FBX format is included in MoI's export types primarily as a means for going into 3DS Max.
- Michael
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