Textures

Every face has a texture. How to apply them: Texturing.

Texture names

A face records its texture by name: the file name without folder or extension. gbl_stone_cobble_01.png is gbl_stone_cobble_01.

Your game says which folders hold textures. The first folder with a matching name wins.
A texture can move folders without breaking any map.
A name with no texture behind it shows your game's fallback texture, if it has one, so you can see and fix the wall.

When a map is saved it records the textures, models and decals it uses. When it is opened, the editor logs any that have gone missing or changed.

Texture scale

Textures are drawn at 4 texels per world unit. A 256 x 256 texture covers 64 x 64 units: one square of the default grid.

A wall on the grid therefore tiles without adjusting anything. Scale, shift and rotate a face's texture in the face tool when you need something else.

Names that mean something

A texture's name can change what a face is.

Name	Example	What the face becomes
Starts with `!`	`!grate_iron`	Cut-out: see-through where the texture is transparent
Starts with `sky_`	`sky_night`	A hole to the sky
Has a partner ending `_emission`	`lamp_glass` beside `lamp_glass_emission`	Glows

Alpha masks

A texture whose name starts with ! is drawn see-through wherever its alpha is transparent. Light passes through the transparent parts in the bake.

Use it on detail: grates, railings, foliage, a window pane.

Warning: A ! texture on a room's own wall shows what is behind it, and behind every room wall is rock with nothing drawn. The 2D views mark such a wall in red. To make a window, carve an opening and put a detail pane in it.

A cut-out grate made of detail over a floor opening

Sky faces

A face whose texture name starts with sky_ is a hole to the sky. The underscore matters: skyline_bricks is an ordinary wall.

The map's sky is drawn on it. Set up the sky with the Sky tool.
It is not lit and does not block light.
It is how sunlight, moonlight and daylight get in, and what makes a room reach the sky. See Lighting.

Put sky faces on air brushes: the ceiling of a courtyard, the far side of a window.

Emissive textures

A texture glows when there is a texture of the same name with _emission added: wall_01 glows wherever wall_01_emission is bright.

Nothing to assign: adding the second file turns the glow on, removing it turns it off.
The glow is baked. It lights the room around it and bounces like any other light.
It is always on: it cannot be switched or dimmed while the game runs.

How bright a white emission texel glows is set for the whole bake by Emission gain. See Lighting.

Water is not a texture

No texture name makes water. Water is a fill on an air brush. See Fills.