I seem to have this problem with hidden unwanted surfaces in AC3D. When I do the models in the editor, they look fine, but when I load them up into the code I often get these ugly black surfaces. look at the picture below as an example. Notice that on each step of the stairway on both sides there apears these little black triangles.
How do I get rid of these things? Or do I have to redo that model all over again?
edit: here's what it looks like in AC3D: