Limit Selection to Visible

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For Blender 2.8 the Edit Mode feature Limit selection to visible, now referenced as Show whole scene transparent, has been updated. When active all Scene objects, in all interaction and editing modes and contexts, appear semi-transparent/semi-opaque, in other words back faces and anterior objects will be visible through the selected item in Object Mode or Weight Paint interaction mode as much as they were in Edit Mode previously.

Design note: Show whole scene transparent is not the same as using transparent materials.

To activate or enable Show whole scene transparent, click the icon [1] to the left of the ‘render’ buttons upper-right of the 3D View, or press Alt + Z. The entire scene, and object within, will appear semi-transparent.

Design note: the level of transparency used by Show whole scene transparent is not immediately editable, a User Preferences option has not been provided to alter it.

Limit selection to visible is now Show whole scene transparent
Limit selection to visible, now Show whole scene transparent [1], effects the entire scene [2] and all interaction modes not just Edit Mode as per previous versions of Blender.

Show whole scene transparent in texture Paint interaction mode
In Texture Paint [1] interaction mode with Show whole scene transparent, objects can still seen behind [3] the selected item [2] as its being painted.

Show whole scene transparent affects all interaction modes in a slightly different way depending on the mode but will generally display back faces and/or anterior objects regardless aiding the task being performed.

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