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http://www.jongware.com/galaxy1.html
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https://en.wikipedia.org/wiki/Texture_mapping
http://www.gamers.org/dEngine/quake/papers/checker_texmap.html
https://www.cs.uic.edu/~jbell/CourseNotes/ComputerGraphics/TextureMapping.html
http://www.decew.net/OSS/References/chapter_2_texture_mapping.pdf