vega prime与C++混合编程实例，模拟飞碟运动，不受惯性重力影响，可以左转右转，加速减速，突然加速、停止等功能，可以用键盘和鼠标控制。-This sample illustrates the use of the UFO motion model (vpMotionUFO). It defines the class myApp, which is derived from vpApp, and overrides the vpApp::onKeyInput() method to a