Limit Selection to Visible

When you have the display mode in Wireframe (Z) you are able to select vertices, edges, or faces that are in front of the model, as well as those that are behind it. This is not possible with the Solid display, which only lets you interact with the parts of the model that are facing you.

In Edit Mode, when a mode other than the Wireframe display is active, right next to the icons on the 3D View header for selecting vertices, edges, or faces is an icon with a little cube that has marked vertices, with a back side that is not visible. If that option is turned on, you’ll only see the parts of the model that are facing you, but if you disable it, you’ll be able to see any of the elements behind the model and you’ll also ...

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