Tile Editing

General Info

Tiles are 16x12
Wall tiles are 16x24, exactly two tiles tall
Tiles should be completely grey - they will be dynamically tinted with custom colours in-game. That is, their R, G, B values should equal.
Some tiles have two colours - they use the "alt" colour in the editor. The areas that should use the "alt" colour should be in a shade of red - no G or B values.
There are 4 types of floor/room tiles:
- normal
- shadow - same as normal tiles but rendered when there's a wall above it, casting a shadow. In GIMP, use the Brightness-Contrast tool and set Brightness to -50.
- alt1 - an alternate version of the normal tile, used for floors; a few normal tiles will be randomly turned into these
- alt2 - an alternate version of the normal tile, used for floors; a few normal tiles will be randomly turned into these
There are 16 types of wall tiles:
- o - single pillar, no walls around it
- n , e , s , w - wall ends; e.g. n has a single wall below it
- nw , ne , sw , se - wall corners; e.g. nw has walls below and to its right
- nt , et , st , wt - wall T-sections; e.g. nt has walls to its left, right and below
- h , v - horizontal/vertical wall sections
- x - wall cross section, has walls all around it

Refer to this ASCII diagram for the wall relations:

nw-e     o
|
v     n
|     |
sw-h--x--ne
      |  |
      wt-et
      |  |
w--h--st-sw
   |
   s

Note that wall tiles with walls below them will be half height (16x12) since the side of the wall is obscured by the wall below.

Make sure the textures tile properly. For continuous textures, GIMP has a Make-Seamless plugin which is a crude way of making it tile-able four-ways. For more control, e.g. two-way tiling, do this manually: copy the texture and move it so that the seam is in the middle, and paint the seam away.
For floor tiles, use tile/tile/ as a template
For wall tiles, use wall/plasteel/ as a template
The lighting is from the top-left, so
- Top/left edges should be bright, top-left corners should be brightest
- bottom/right edges should be dark, bottom-right corners should be darkest
- The top of wall tiles should be brighter than the front