此示例说明了如何使用vrLight的。它定义类MyApp ，这是从vrApp派生，并覆盖vrApp :: onKeyInput （ ）方法，以便下面描述的键盘输入。示例显示一个简单的球体，并且允许用户修改的照明参数。-This sample illustrates the use of vrLight.　It defines the class myApp, which is derived from vrApp, and overrides the vrApp::onKeyInput() method to allow for the keyboard input described below.　The sample displays a simple sphere and allows the user to modify the lighting parameters.