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i never used 3Dsmax, but maybe you should check the directions of all normals. if some of them are reversed, they are only visible from one side.
try to check this in director by making all models visible from both sides.
repeat with i= 1 to member("my3Dworld").models.count
if your models look now correct, go back to 3dsmax and make all normals look into the correct direction. maybe you have in max someting like backfaceculling for the preview-window.
if this is not working, maybe some max user can tell you a solution...
Hondo.....as usual you've got the answer. I though I had tried unifying the normals within 3dsmax....but must have failed somewhere. Using a visibility=#both with lingo causes the models to be complete.
You've totally made my day. Thanks so much for the help!
the good thing is that you know your models are complete, the bad thing about visibility=#both is that it leads into bad performance.
i made this little screencapture some time ago to show how to flip normals in cinema4D.
and i think there must be something in 3Dsmax that displays the normals so you can detect them. another problem with some normals showing into the wrong direction is, that you get problems with "phong" shading.
so better controll all normals before you export. using " visiblility=#both" will take you the half performance away because now the double number of polygons have to be rendered, even if they are not visible.