摘要：It's pretty simple to build your own look-at matrix.First, calculate forward, right, and up vectors. The forward vector should be a unit vector pointing in the direction that your camera is looking. T... 阅读全文

摘要：所谓namespace，是指标识符的各种可见范围。C＋＋标准程序库中的所有标识符都被定义于一个名为std的namespace中。一、<iostream>与<iostream.h>的区别<iostream>和<iostream.h>是不一样，前者没有后缀，实际上，在你的编译器include文件夹里面可以看到，二者是两个文件，打开文件就会发现，里面的代码... 阅读全文