|ZoneID||ID||Sets the active zone. All subsequent tiles will be applied to this zone, unless the ZoneID is changed again.|
|HT||Location,x,y,length||Maps a horizontal row of tiles at coordinate (x,y) of 'length' tiles to identify as 'location'.|
|VT||Location,x,y,length||Maps a vertical column of tiles at coordinate (x,y) of 'length' tiles to identify as 'location'.|
|RT||Location,x,y,xlen,ylen||Maps a rectangular span of tiles. The top left corner is at position (x,y) and will cover a span of (xlen,ylen) tiles.|
Map region names are defined in MapDef.txt, under the Name field. The location parameters in this file should match those names.
All other parameters to HT, VT, and RT lines are otherwise integers referring to terrain tiles that are 1920 units wide. Not scenery tiles, which can have zone-dependent sizes.