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I wanted to make my work on a 3D rendering engine available for somebody who might find it useful . The whole thing is one header file : you enter screen height, width , angle of sight , direction of sight and position of the eye and the coordinates of a 3D point and you get the x,y coordinates of that point on the screen, as simple as it can get. What that gives you is the capability of making vector structures easily . The comments on the code are in english and bulgarian (I haven't interpreted them all) . If you have any questions (as in you want to know how it works , because it'll be hard to get from the code) or remarks I'd be happy to address them :) .