I'm modeling a car via a tutorial, and for some reason, the mesh is doing this:
Notice how the mesh is not touching the tips of angle -- instead bending in. This is happening all over my model. What have I pressed, and how can I stop it from happening?
(Currently using Blender 2.79b)
Looks like you accidentally added a Subdivision surface modifier. You can remove it by going to the Modifiers tab (the blue wrench) and clicking the x button in the upper-right hand corner of the modifier.
If you don't remember adding the modifier, I'm not surprised -- you probably pressed the keyboard shortcut for it by accident:
From the Blender Reference Manual:
To quickly add a subsurf modifier to one or more objects, select it/them and press Ctrl+1. That will add a subsurf modifier with View Subdivisions on 1.
You can use other numbers too, such as Ctrl+2, Ctrl+3, etc, to add a subsurf with that number of subdivisions. The Render Subdivisions will always be on 2 when added like this.
Although it may be annoying now, the Subdivision surface modifier generally proves to be one of the most useful tools in any hard-surface modeler's toolkit. Combined with Loop subdivide, you can make edges more rounded (and therefore more natural -- nothing is a perfect angle in the real world) without all of the shortcomings of the Bevel modifier.
