vega prime与C++混合编程实例，模拟步行运动，可以实现左转右转，前进后退等功能，遇到障碍物会碰撞，可以调节身高速度等数值，可以用键盘和鼠标互动。-This sample illustrates the use of the walk motion model (vpMotionWalk) and a user defined collision detection position strategy. It defines the class myApp, which is deri