3D window

The 3D window is where objects are positioned, moved, turned, etc. At design time we create scenes, and within a scene we embed and position objects, to set the stage before the play of the animation. At runtime the objects in the 3D window are manipulated by the program methods. Thus, the 3D window has a double role: it lets the user set the stage at design time, and serves as the play window at runtime.

Objects cannot be added to the stage or removed from it at runtime. At runtime objects can be moved, turned, brought into the stage, moved out of the stage, become visible/invisible, but the hierarchic structure of the current world cannot be manipulated.