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Old January 5, 2011, 17:30   #29
Nomad
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The graphic pref files actually already include entries for four different types of wall tiles, labelled 'basic', 'inner', 'outer' and 'solid'. It looks like only the 'basic' type are ever actually generated by the game at present, but the others do have numbers and can be assigned graphics, so I guess it was intended at some point to implement a similar sort of four-tile system.

I think the Nethack wall tiles use a four-tile system, where you've got horizontal walls, vertical walls, and 'front' and 'back' corner blocks, like so:

Code:
B-----B
|     |
|     |
F-B B-F
  | |   
  | |
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