Level Editor/Menus/Edit

The Edit menu holds undo, the brush operations, displacement commands, and the click-through and snapping switches. Every edit it makes is one undo step.

Undo and selection

Item	What it does
Undo / Redo	Undo or redo the last edit (Ctrl+Z / Ctrl+Y).
Delete	Delete the selection (Delete).
Duplicate	Copy the selection (Ctrl+D). Each copy lands beside its source, nudged a little so it does not hide inside it, and keeps everything posed inside it (a group keeps its doors where you swung them).
Subtract Brush (CSG)	Carve one brush out of others. Select the brushes to carve from first, then the cutter last (the last selected is the cutter). Spheres cannot be used. If fewer than two brushes are selected the status line says Select 2+ brushes (active brush = cutter). See Brushes and CSG.
Merge Brushes	Join two or more selected brushes into one brush. With fewer selected: Select 2 or more brushes to merge.

Brushes

Item	What it does
Snap Selection to Grid	Moves every vertex of the selected brushes onto the current grid.
Center Origin	Moves a brush's origin (its pivot) to the center of its geometry, without moving the geometry. Status: Origin centered.
Group Selection (Ctrl+G)	Puts the selection into a new group. With nothing selected: Select what to group first.
Toggle Collision Only	Makes the selected brushes collision-only (invisible in the game, but solid: a clip brush), or back. See Collision-only brushes.

Displacements and terrain

Item	What it does
Convert Face to Displacement	Turns the selected faces into sculptable displacement surfaces. Select quad (four-sided) faces with the Edit Face tool first, or the status line says Select quad faces in Face Edit mode first.
Remove Face Displacement	Turns the selected displacement faces back into flat faces. Needs displacement faces selected (Select displacement faces first).
Sew Displacement Edges	Stitches the shared edges of neighboring displacements so they meet without a seam. Select the brushes whose displacement faces touch (Select brushes with adjacent displacement faces).
Cut Terrain Under Selection	For props that carry a terrain cut (a cave mouth, for example), hides the terrain cells inside the prop's opening, on every terrain of the map. The test is in 3D, so on a cliff only the cells around the opening go. Cutting is something you do by hand: if you move the prop, cut again, and repair the old spot with the Terrain tool's Fill hole brush.

UVs

Item	What it does
Re-estimate UVs	Recalculates the texture mapping of the selected brushes from their shape, as a new brush would have it. Use it when a texture is stretched after heavy vertex editing. Status: Re-estimated UVs on selected brushes.

Click-through

Check items. Each makes viewport clicks pass through one kind of volume so you can select what is behind it. All are off by default, and they are the same switches as in Settings.

• Click Through Collision Brushes
• Click Through Zone Brushes
• Click Through Sound Volumes

Snapping

The same switches as the Snapping tab. All are on until you turn them off.

Item	What it does
Grid Snapping	Placed points and drags snap to the grid. Off, what you place starts where the cursor hits.
Smart Guides	Drawing, moving and resizing snap to what is near: lined up, centerd, equally spaced, equally sized, with red guides.
Smart Grid on Faces	A shape drawn on a slanted or turned face snaps to the face's own grid and stands square to it.
Snap to Visible Geometry	A placed point snaps onto the corners, edge midpoints and edges of the brushes you can see, before the grid.
Smaller Grid / Larger Grid	Halve or double the grid step ([ / ]). The status line says the new step, for example Grid step 0.5 m.

Related pages

• Brushes and CSG
• Snapping