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Perspective Texture Mapping -- for idiots

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Hi, I am an idiot who cannot understand anything unless it is put in child-like terms. I want to understand inverse (backwards) perspective-correct texture mapping. I have read a million different explanations and have failed to get working code. Please help me. So far I have a ScanConverter class that will take an arbitrary projected polygon and turn it into scan lines. I also have a Texture class where I can get the color of any pixel. How do I get these two working together with gradients, edges, etc? Your pseudo-code will make my day/week/month/year/life!!! (Guilty admission: I am actually trying to do this in ActionScript but I'm fluent in C#, Java and somewhat in C++). Thank you and have a pleasant life. --Skyser

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