> But I get grief from them about black surfaces. I am getting tired of telling them to make all surfaces one sided and then flip them the right way round!
Get them to show normals and check that they are all facing how they want them. Press 'n' to show-normals. Reverse normals with Surface->flip-normal.
Black surfaces may be due to polygons not being handled by the other code (the sample AC3D loader won't handle them). AC3D internally supports concave polygons (e.g. a single polygon 'C' shape) which is a bit more involved to code.
In AC3D, objects that don't need to have two-sided surfaces are set to single sided e.g. spheres. single surfaces and 2d shapes have two-sided by default. I don't feel a global setting makes sense here but as always, we are open to ideas.
The attribute for 1S/2s is set in .ac files in the surface flag.
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