试验名称：一、三维空间实体在二维平面上的投影，二、三维空间实体在二维平面上的显示，三、三维空间实体如何实现自身的消隐，四、三维空间中多个综合实体的消隐，五、如何实现从不同角度观察三维实体-pilot's name : a three-dimensional spatial entities in the two-dimensional plane of the projector, two, 3D space entities in the two-dimensional plane, three, three-dimensional space entities how to achieve their own hidden, 4, three-dimensional space over the consolidated entity, the hidden, 5, how to achieve from different angles 3D