有关AABB的碰撞测试，展示了一个球在不同曲面上的运动，简单的使用了摩擦力等等。-The AABB collision test, shows a different surface on the ball movement, the simple use of the friction and so on.

DIRECTX下的2000个bullet运动测试 src文件夹是测试程序的源代码 D3D_XD_src是D3D_XD引擎的源代码 bin是可执行程序-DIRECTX under the 2000 bullet exercise test src folder is the test program' s source code D3D_XD_src is D3D_XD engine source code is the executable program bin