《3d game engine programming》原书有错误导致部分章节源代码不能编译，本源代码修改错误部分，详细错误更改请详见http://stefan.zfx.info/3dgep.html作者本人做的修改解释-"3d game engine programming," the original book has led to the wrong sections source code, compile, source code changes wrong, wrong details please see changes http :// I do stefan.zfx.info/3dgep.html authors explain changes
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