绘制带有光照效果的场景；

场景包含3个茶壶，通过键盘1,2,3可以分别选中三个茶壶，然后用鼠标对每个茶壶进行分别的旋转；

使用点光源，点光源为白色，以白色的球体表示；

使用3个不同的点光源

光源1的坐标设置在世界坐标系中，并围绕着三个茶壶的中心进行圆周运动；

光源2 的坐标 设置在观察坐标系，不发生变化；

光源3的坐标设置在茶壶1的物体坐标系中，当茶壶1被选中进行旋转时，光源3要跟随茶壶1 做相同的旋转；-Drawn scenes with lighting effects　contains three scenes teapot keyboard 1,2,3 can select three teapot, and then use the mouse, respectively, the rotation of each teapot　using a point source, point light source is white, white sphere　use the coordinates of the three different point light source 1 is set in the world coordinate system, and around the center of the circular motion of three teapot　the coordinates of the light source 2 provided in the observation coordinate system does not change　the coordinates of the light source 3 is provided in an object coordinate system in the teapot, the teapot 1 is selected for rotation, the light source 3 to follow teapot 1 do the same rotation