If set to True, then trails and line drawings fade each time the Screen object is updated. Read/write Boolean.
The rate at which trails and line drawings fade is controlled through the FadeRate property.
The Screen object can be updated by calling the Update Method.
The Screen object is updated automatically at the termination of the OnSimBegin, OnSimStep, and OnSimEnd events.
The following example sets the fade rate for line drawing.
World.Screen.FadeRate = .02
World.Screen.FadeMode = True