zuoye2

说明：  1.#利用VisibilitySensor可视传感器节点，创建一个用紫红色小球是否可见控制白色正方体造型旋转的场景。 #紫红色小球的位置与VisibilitySensor可视传感器节点设定的感知区域基本相同，小球可作为感知区域的标志 #一旦能够看到小球，正方体开始循环旋转动画；当看不到小球时，正方体旋转一个周期后自动停止运行。 2.创建一扇对开的大门，并设置一个音乐门铃。按下门铃，则播放音乐同时大门自动开合。
(1. # The position of the purple-red sphere is basically the same as the perception area set by the Visibility Sensor visual sensor node. The sphere can be used as a symbol of the perception area. # Once the sphere is visible, the cube starts to rotate around the animation; when the sphere is not visible, the cube rotates for a period and automatically stops running. 2. Create an open door and set a music doorbell. When the doorbell is pressed, the music is played and the door opens and closes automatically.)