Try dropping an STL check on there and see what it tells you. Oh, also if it's a really heavy model it could just be the adaptive degradation that max has on by default for viewports.
Here's a .gif comparing the various imports options and how they affect the normals. I've no idea why the .stl came in at the wrong scale. At no point during the export from Fusion or the import in Max did it give an option to change the scale. But if we ignore this scaling and reset the transform on the oversized mesh as…
Collapse that motherf'n stack! Do this regularly. Reset Xform too, and collapse. Turn on backface culling, check for flipped normals, and check for other probs with a STL Check modifier.
Thanks, STL Check seemed to have picked up a lot if not all the problem points. I'll update when I've fixed everything it highlighted and see if that solved the problem :)
Another all rounder, tailor made with young'uns in mind would be 3D Slash (a piece of cake) 'gamey' UI alongside works with .stl files - either free or paid licensing as well.
It happens when u have overlapped vertices . Just select all the vertices and weld them at a very low threshold, or try STL check modifier , if there is any mesh errors.
This is freakin' awesome. Would you be willing to let stl files of this out??? I'd love to print one out for myself, just to say I have one. Always loved the movie.
How about one of these? http://www.betabrand.com/mens-stl-tessellated-tyvek-wind-shell-jacket.html I'd prefer one with clean, animatable geo, but the decimated pattern is still kinda nifty.