I'm using Max 3.1.
When I import a file from a Cad program it works fine until I use a
subtraction Boolean operation on it.
As a simple example, if I import a sphere in this format (.stl or
stereolithography) and make a flat spot by Boolean subtraction it appears
as if I can see through the object where the flat spot is. But if I rotate
it to view from the back it is solid (can't see through the flat spot). I'm
new to working with imported Cad files in Max. I have never seen this
happen in anything that I have made all the way in Max.
Any helpful advice would be appreciated.