Selecting

The Select tool is the default. Press Esc in any other tool to get back to it.

Clicking

Do	How
Select a brush or entity	click it
Select a face	hold `Q` and click it, or click it in face mode
Add to or remove from the selection	`Cmd`-click
Pick the far side of a surface	`Alt`-click
Select one brush of a group or prefab instance	hold `I` and click
Clear the selection	click empty space, or press `Esc`
Select everything not selected	`Cmd` `I`

The brush under the cursor lights up before you click. In face mode the face under the cursor lights up instead.

Face mode

Tap Q, or press Faces on the toolbar, and clicks select faces rather than brushes until you tap it again. Hold Q instead and it lasts only while the key is down, for a face or two in passing. The tool help at the foot of the left panel says which mode you are in.

In a carved world the near side of a wall is usually rock you do not want. Alt-click picks the side facing away from you.

Things behind other things

When more than one thing is under the cursor, the tool help at the foot of the left panel says how many. Double-click the same spot to open a list of all of them. Hover an entry to light it up; click it to select it.

Dragging a box

In a 2D view, drag from empty space to select everything inside the box.

Cmd-drag adds to the selection.
In face mode the box selects faces instead of brushes.
Push against the edge of the view and it scrolls, so the box can take in what was off screen.

Box selection works in the 2D views only. Hidden layers and brushes outside the current narrowing are skipped.

Groups

Brushes in a group are selected together.

Select the brushes.
Press Cmd G to group them. Cmd Shift G ungroups.

Hold I and click to select one brush of a group on its own.

Prefab instances select as one piece too. See Prefabs.

Faces

Once one face is selected, grow the selection from it. These are in the Selection menu and the right-click menu.

Command	Selects
Grow Face Selection	every face touching a selected one
Select Face Loop	the loop of faces running through the selected ones
Flood Fill Faces (`Cmd` `Shift` `F`)	faces reachable from the first selected one across shared edges, turning no more than 30° at each

Narrowing

Narrowing hides everything except the selection, so you can work on it without the rest of the level in the way.

Select what you want to work on.
Press Cmd N. Everything else is hidden.
Select within what is left and press Cmd N again to narrow further.
Press Cmd Shift N to go back one level. Press Cmd N with nothing selected to show everything again.

What you draw while narrowed joins the narrowed view. What you delete is gone at every level.

The Selection panel on the left lists the levels. Each level has a ghost toggle: turn it on to see what that level hid, faded, instead of not at all.

The Selection panel while narrowed two levels deep

Focus

Cmd A moves every view onto the selection.

Finding an entity

Ctrl F (Selection → Find Entity…) opens a field over the views. Type, and the list under it narrows to the entities that match:

A word matches an entity whose type, name, id or any text property contains it. lamp finds every light_point named cellar_lamp, and every prop whose model is lamp_post.
Several words must all match: door vault.
key=value matches one property: type=light, name=vault, target=alarm_1.

The Find Entity field listing two lamps, the first selected and every view on it

Up and Down walk the list, and clicking a row does the same: the entity is selected and every view moves onto it, with the field still open. Enter goes to the highlighted row and closes the field; Esc closes it and leaves the selection as it is.

A row drawn faintly is an entity on a hidden layer, or outside what the views are narrowed to. With nothing typed the list is every entity in the map, by type.