The KeySwithLayer cycle through sub-layer according to a pressed key.
The KeyToggleLayer turns on and off its sub-layers according to a pressed key.
The LodToggleLayer turns on and off its sub-layers according to a zoom of the view in the Vis singleton (nearness of the "camera" to the scene).
A SwitchLayer can simply cycle drawing through sub-layers or draw nothing.
A ToggleLayer can simply switch, if the sub-layers are drawn or not.
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