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The view cube

A cube in the corner that says which way you are facing, and takes you anywhere.

Off until you ask for it. /cube on puts it in the top right of a 3D view; /cube off takes it away. It is remembered after that.

Using it

A click on the cube's top face flies the view round to look straight down; the flat square that is left shows a ring of targets round its border, and clicking one flies back out to a three-quarter view.
A click on the top face, and the view flies round to look straight down - it never jumps, which is what stops you losing your place. Square on, the cube is a flat square, and the ring of eight targets round its border is drawn so there is still something to aim at: rest on one and it lights up, click it and you are back out.
Square on to a face, the cube is a flat square - its real edges and corners are edge-on and have no width to click. So the border of that square is divided into eight instead: the four sides are the edge views either way off this face, and the four corners are corner views. They are drawn while you are square on, and light up as you pass over them.

One thing to expect whatever you click: the cube rolls as the view does, so where a corner was a moment ago is not where it is now. Aim after it has settled, not before.

From the keyboard

In the 3D view, Ctrl and an arrow key walks around the cube a step at a time, gliding the same way a click does.

The cube does not have to be showing for this to work.

Every click flies the camera there rather than jumping, and it pivots on what you are looking at. Watching it turn is what stops you losing your place.

Where it sits

/cube tl, tr, bl or br puts it in whichever corner suits you. Top right unless you say otherwise.

Framing what you picked

/cube fitselection on makes a click bring what you have selected into the middle and size it on the way round. With nothing selected it never re-frames - it just goes to the view you asked for. /cube fitselection off turns it back off.

Why it is there

The VIEW menu along the top tells you the name of a view. The cube tells you which way around you are, which is the thing you actually want to know when you have been spinning a model for ten minutes. This one is Revit's idea; SketchUp has no such thing.

The VIEW menu open under the menu bar: Fit, the paper modes, every camera preset, then the grid, the cube and the two panels.
Every named view is on the VIEW menu, with the paper modes above and the grid, cube and panels below. A check mark says which one you are in.

See also