View source for EarthBound/Map Data/Tile Arrangement Collision Data

{{subpage|game=EarthBound:ROM map}}

{{Infobox table|name=Map Data: Tile Arrangement Collision Data
|game=EarthBound
|loc=ROM
|start=<tt>0x180200</tt>
|end=<tt>0x18914F</tt>
|numentries=2293
|entrylength=16 bytes (<tt>0x10</tt>)
|totallength=36688 bytes (<tt>0x8F50</tt>)
}}

Data block storing collision data and other player/NPC interaction data for [[EarthBound:Map_Data:Compressed_Tile_Arrangement_Data|map tile arrangements]]. Collision data for all tilesets is stored together, each entry reusable within and between tilesets. Data is referenced by the [[EarthBound:Map_Data:Tileset_Tile_Arrangement_Collision_Pointer_Tables|Tileset Tile Arrangement Collision Pointer Tables]].

==Format==

Each entry contains 16 tile subentries, each 1 byte. The 16 subentries collectively represent data for a 4x4 grid of background tiles (same as [[EarthBound:Map_Data:Compressed_Tile_Arrangement_Data|map tile arrangements]]) with each row in left-to-right order, followed by the next row, etc. Thus, within an entry, the collision data for a tile at a given <tt>0-3/0-3</tt> x/y coordinate can be found using the formula <code>subentry_offset = x + y * 4</code>.

===Tile Subentry Format <span class="anchor" id="Tile_Format"></span>===

Each 1-byte subentry is a bitmap of flags that apply to the associated map tile.

<code>S00MWDAB</code>

* <tt>S</tt> (bit <tt>10000000</tt>): Tile is '''s'''olid and blocks normal movement.
* <tt>00</tt> (bits <tt>01100000</tt>): Unused bits. Always zero in an unmodified ROM and no known effect.
* <tt>M</tt> (bit <tt>00010000</tt>): Tile contains a special '''m'''ap object (door/stairway/ladder/etc). Earthbound will only look for such objects on tiles with this flag set.
* <tt>W</tt> (bit <tt>00001000</tt>): '''W'''ater tile. Players/NPCs moving through the tile will have their appearance, speed, and sound modified accordingly.
* <tt>D</tt> (bit <tt>00000100</tt>): '''D'''amaging tile. Players will be susceptible to heatstroke status effects while standing on this tile. Alternately, if combined with flag <tt>W</tt> (bit <tt>00001000</tt>), designates a deep-water tile where the whole player/NPC will be submerged and take damage.
* <tt>A</tt> (bit <tt>00000010</tt>): Upper sprite priority drop. If a player/NPC is positioned on this tile, sprites from the upper half of the entity will have lowered priority and be rendered behind any map foreground tiles (see [[EarthBound:Map_Data:Compressed_Tileset_Character_Data#DecompressedFormat|Tileset Character Data]]). Typically combined with flag <tt>B</tt> (bit <tt>00000001</tt>) to designate that a player/NPC standing on the tile will be entirely behind and hidden or obscured by some map object rendered in front, e.g. a building or a tree. <p>Alternately, if combined with flag <tt>S</tt> (bit <tt>10000000</tt>), designates that players can interact with NPCs on the other side of the tile. Used to implement tables, desks, etc.
* <tt>B</tt> (bit <tt>00000001</tt>): Lower sprite priority drop. If a player/NPC is positioned on this tile, sprites from the lower half of the entity will have lowered priority and be rendered behind any map foreground tiles (see [[EarthBound:Map_Data:Compressed_Tileset_Character_Data#DecompressedFormat|Tileset Character Data]]). If not combined with flag <tt>A</tt> (bit <tt>00000010</tt>), can be used to create advanced layering effects where a player/NPC appears behind one map object but in front of another.

See [https://github.com/pk-hack/CoilSnake/wiki/Collision-Data Coilsnake Wiki] for explanations of the most common flag combinations.

[[Category:EarthBound:Map_Data|Tile Arrangement Collision Data]]