Controlling Layer States

One of the best aspects of working with layers is the flexibility with which you can control their visibility. So far we have looked at the colour and linetype properties of layers. However, there are a number of other properties all of which relate to whether or not objects on a layer can be seen and/or modified. The current state of these properties are all indicated by icons in the various layer lists. You will already have seen them if you have been following this tutorial. The meaning of these icons is shown in the table below:

Icon	Name	Description
	On	The layer is visible unless it is also frozen
	Off	The layer is invisible but objects are still regenerated unless it is also frozen
	Thaw in all viewports	The layer is not frozen
	Freeze in all viewports	The layer is invisible and objects are suspended from regeneration
	Thaw in current viewport	The layer is not frozen in the current viewport
	Freeze in current viewport	The layer is frozen and invisible in the current viewport but may be visible in other viewports.
	Thaw in new viewports	The layer is not frozen in new viewports when they are created
	Freeze in new viewports	The layer will be frozen in any new viewport
	Unlock	The layer is unlocked
	Lock	The layer is locked and objects cannot be selected or modified