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OpenGL 2d image but drawing a line on it in 3d space

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Hey guys, I've got a PPM image that I render to a screen, but I'd like to draw 3d lines on it rather than basic 2d lines. Would this require the PPM image to have a Z co-ordinate too? Can someone please shed some light cause I'm quite confused. I'm new to the world of OpenGL and would love some guidance. Cheers, John

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