How can I render a wireframe scene with hidden lines removed?
The preferred method is to render your geometry in two passes: first render it in fill mode with color set to the background color, then render it again in line mode. Use polygon offset so the lines over the polygons render correctly. The polygon offset section might be helpful to you. Often you need to preserve a nonuniform background, such as a gradient fill or an image. In this case, execute the fill pass with glColorMask() set to all GL_FALSE, then perform the line pass as usual. Again, use polygon offset to minimize Z fighting.
