General Info

• Floor/room 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--nt-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.
• Door tiles have variable size and are currently not tinted. Doors should have minimal colour, because there are 4 colour-coded versions corresponding to the keys. There are the following tiles:
  • Horizontal doors
  • Vertical doors - these are usually skinnier than the standard 16x12 tile size, but they will be centre-aligned
  • Open tiles - these are displayed when the door is open, at the feet of the doors. For single-tile vertical doors, these aren't shown because they are obscured by the wall below.
  • Wall tile - these are shown on the top-most tile of a vertical wall when it is open; it represents a socket on the wall where the door slides (or retracts into?). They are variable size but will be horizontally centred and bottom aligned.

Tips

• 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