Hi Ronald, the easiest way (other than just enabling double sided materials like you mention so you usually don't need to worry about it) is to make your object a solid in Moi instead of open surfaces. When your object is a solid it will have its normals automatically oriented towards the outside of the solid volume.
If it's not easy to make your object a finished solid, then the next best thing is to make sure the surfaces are at least all joined to one another - don't have just individual separate surfaces sitting alongside each other, make sure to use the Edit > Join command so that those surfaces are one joined structure that have shared edges between each surface.
When surfaces are joined together the mesher will take care to orient the mesh faces for each surface in one consistent direction. If that ends up not being the correct direction you can then flip the whole thing in one go to correct it rather than trying to flip individual separate pieces.
> I could flip the plygons afterwards in my 3D program, but then I can no longer use the
> "user normals" that get exported with my mesh.
It's kind of strange that they don't just flip the user normals at the same time as the polygons are flipped...
In the past I have assumed that if a program is sensitive to the particular normals direction that they would have some tool included with it to flip it properly, but sadly that seems to be often not the case.
- Michael
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