crude 3d

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I'm trying to program a spinning cude, but I'm trying to do it with basic draw commands. I know this might sound a bit crude (ie 10 draw 320,200 to 340,200 etc ie not openGL but basic maths so that you could do it on a ZX Spectrum if you had to) but I'm interested in the mathematics of it. I've read several books that talk about matrices but I'm none the wiser. How do you project a 3d cube onto a 2d screen and then rotate it? I will buy the person who can answer this many drinks! Ben

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crazy ben

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