vega prime与C++混合编程实例，模拟第一人称游戏运动，可以左转右转向前向后，类似CS运动模式，能精确调整速度，加速度等数值，可以用键盘和鼠标互动。-This sample illustrates the use of the game motion model (vpMotionGame). It defines the class myApp, which is derived from vpApp, and overrides the vpApp::onKeyInput() me