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Looks like an issue with texture mapping. There are several possible errors that could be resulting in this, so I'd print out texX, texY, and color to make sure they all look like they should (texX and texY shouldn't be 0 all the time, color shouldn't be black). If all of those look fine i'd check to make sure your textures are loading properly.Hope that helps! I haven't checked up on this instructable in forever but I'm glad to see people are still following it
You can check out this tutorial here for a more detailed explanation w/ pics: http://permadi.com/1996/05/ray-casting-tutorial-table-of-contents/
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