(svn r13729) -Fix: assumption that non-north tiles of a house do not have the 1x1 building bit set was flawed with some NewGRFs. This caused the amount of houses to differ, which causes the town radii to differ, which causes desyncs when towns are expanded.
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<meta name="Author" content="Marcin Grzegorczyk">
<meta name="Description" content="Structure of OpenTTD (OTTD) landscape arrays">
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<title>OpenTTD Landscape Internals</title>
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<h3><a name="Landscape">Landscape</a></h3>
<p>Seven attributes (counting "<span style="font-weight: bold;">type_height</span>") hold the informations about a tile.<BR>
These attributes are referred to as
"<span style="font-weight: bold;">type_height</span>",
"<span style="font-weight: bold;">m1</span>", "<span style="font-weight: bold;">m2</span>",
"<span style="font-weight: bold;">m3</span>", "<span style="font-weight: bold;">m4</span>",
"<span style="font-weight: bold;">m5</span>" and "<span style="font-weight: bold;">m6</span>".<BR>
The most important value is the class of a tile, stored in the upper 4 bits
of the <span style="font-weight: bold;">type_height</span> attribute. The lower 4 bits are used to encode the height and
slope data.
</p>
Special Attribute : <span style="font-weight: bold;">m6</span>. There are 4 bits of it that are used accross multiple tile classes<br>
<ul>
<li>
<a name = "bridge_direction">
Bits 7..6 :
<table border="1">
<tr bgcolor="#CCCCCC"><td colspan="2">Presence and direction of bridge above,<br>for tiles that support this.</td></tr>
<tr><td><tt>00</tt> </td><td>no bridge</td></tr>
<tr><td><tt>01</tt> </td><td>Axis X (North-East)</td></tr>
<tr><td><tt>02</tt> </td><td>Axis Y (South-West)</td></tr>
</table>
</li>
<li>
<a name = "tropic_zone">
Bits 1..0 :
<table border="1">
<tr bgcolor="#CCCCCC"><td colspan="2">Only meaningfull in tropic climate.<br>It contains the definition of the available zones</td></tr>
<tr><td><tt>00</tt> </td><td>normal</td></tr>
<tr><td><tt>01</tt> </td><td>desert</td></tr>
<tr><td><tt>02</tt> </td><td>rain forest</td></tr>
</table>
In any other climate, those 2 bits are free of use.
</li>
</ul>
<p>
For a graphical representation of the tile-layout have a look at
<a href="landscape_grid.html">Landscape grid</a> page.
</p>
The <a name="OwnershipInfo">owner of a tile</a>, as frequently associated with attribute m1,
can be either players (human or AI) or "Game entities".
They are identified using:
<table border="1">
<tr><td><tt>00</tt> </td><td align=left>current player</td></tr>
<tr><td><tt>01..08</tt> </td><td align=left>AI or network players</td></tr>
<tr><td><tt>0F</tt> </td><td align=left>a town owns the tile</td></tr>
<tr><td><tt>10</tt> </td><td align=left>nobody owns the tile</td></tr>
<tr><td><tt>11</tt> </td><td align=left>"water" owns the tile</td></tr>
<tr><td><tt>FF</tt> </td><td align=left>spectator in MP or in scenario editor</td></tr>
</table>
<p>OTTD's class-specific periodic tile processing routine is called once every +256 ticks for each tile.</p>
<table border=1 cellpadding=3>
<tr bgcolor="#0099FF">
<th align=left><font color="#FFFFFF">Class</font></th>
<th align=left><font color="#FFFFFF">Meaning & details of encoding</font></th>
</tr>
<tr bgcolor="#CCCCCC">
<td align=left><strong><a name="Class0"><tt> 0 </tt></a></strong></td>
<td align=left> <strong>Ground </strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the tile (normally <tt>10</tt>)</li>
<li>m2: see fields</li>
<li>m3 bits 3..0: see fields</li>
<li>m4 bits 7..5: type of hedge on the SW border of the tile (1 through 6, or 0=none)</li>
<li>m4 bits 4..2: same as 7..5, but for the SE border</li>
<li>m5 bits 7..5: update counter, incremented on every periodic processing for tile types,
other than <tt>03</tt>, <tt>07</tt>, <tt>0B</tt>, <tt>10</tt> and above.<BR>
on wraparound, the tile is updated (for fields, the type of fields in m3 is increased, for other types the tile type in m5 is increased).<BR>
For snow and desert, these bits are not used, tile is updated on every periodic processing.</li>
<li>m5 bits 4..2: tile type:
<table>
<tr>
<td nowrap valign=top><tt>0</tt> </td>
<td align=left>bare land / grass</td>
</tr>
<tr>
<td nowrap valign=top><tt>1</tt> </td>
<td align=left>rough land (density must be 3)</td>
</tr>
<tr>
<td nowrap valign=top><tt>2</tt> </td>
<td align=left>rocks (density must be 3)</td>
</tr>
<tr>
<td nowrap valign=top><tt>3</tt> </td>
<td align=left>fields (density must be 3)
<ul>
<li>m2: index into the array of industries (farms), INVALID_INDUSTRY (0xFFFF) if farm has been removed</li>
<li>m3 bits 3..0: field type (legal values: 0 through 9)</li>
</ul>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>4</tt> </td>
<td align=left>snow</td>
</tr>
<tr>
<td nowrap valign=top><tt>5</tt> </td>
<td align=left>desert (density must be 1 or 3)</td>
</tr>
</table>
</li>
<li>m5 bits 1..0: density:
<table>
<tr>
<td nowrap valign=top><tt>0</tt> </td>
<td>bare land</td>
<td></td>
<td></td>
<td></td>
<td>1/4 snow</td>
<td></td>
</tr>
<tr>
<td nowrap valign=top><tt>1</tt> </td>
<td>1/3 grass</td>
<td></td>
<td></td>
<td></td>
<td>2/4 snow; </td>
<td>1/2 desert</td>
</tr>
<tr>
<td nowrap valign=top><tt>2</tt> </td>
<td>2/3 grass</td>
<td></td>
<td></td>
<td></td>
<td>3/4 snow</td>
<td></td>
</tr>
<tr>
<td nowrap valign=top><tt>3</tt> </td>
<td>full grass; </td>
<td>rough land; </td>
<td>rocks; </td>
<td>fields; </td>
<td>full snow; </td>
<td>full desert</td>
</tr>
</table>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class1"><tt> 1</tt></a></strong></td>
<td><strong>Railway tracks</strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the tile</li>
<li>m2: see waypoint and signals</li>
<li>m3 bits 7..4: see signals</li>
<li>m3 bits 3..0 = <a name="TrackType">track type</a>:
<table>
<tr>
<td><tt>0</tt> </td>
<td>conventional railway</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>electrified railway</td>
</tr>
<tr>
<td><tt>2</tt> </td>
<td>monorail</td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>maglev</td>
</tr>
</table>
</li>
<li>m4 bits 7..4: see signals</li>
<li>m4 bits 3..0: Ground type (values with fences are not valid for depots and checkpoints)
<table>
<tr>
<td nowrap valign=top><tt>0</tt> </td>
<td align=left>on bare land</td>
</tr>
<tr>
<td nowrap valign=top><tt>1</tt> </td>
<td align=left>on grass, no fences</td>
</tr>
<tr>
<td nowrap valign=top><tt>2</tt> </td>
<td align=left>fence on the NW side</td>
</tr>
<tr>
<td nowrap valign=top><tt>3</tt> </td>
<td align=left>fence on the SE side</td>
</tr>
<tr>
<td nowrap valign=top><tt>4</tt> </td>
<td align=left>fences on the NW and SE sides</td>
</tr>
<tr>
<td nowrap valign=top><tt>5</tt> </td>
<td align=left>fence on the NE side</td>
</tr>
<tr>
<td nowrap valign=top><tt>6</tt> </td>
<td align=left>fence on the SW side</td>
</tr>
<tr>
<td nowrap valign=top><tt>7</tt> </td>
<td align=left>fences on the NE and SW sides</td>
</tr>
<tr>
<td nowrap valign=top><tt>8</tt> </td>
<td align=left>fence on the E side (track in the W corner)</td>
</tr>
<tr>
<td nowrap valign=top><tt>9</tt> </td>
<td align=left>fence on the W side (track in the E corner)</td>
</tr>
<tr>
<td nowrap valign=top><tt>A</tt> </td>
<td align=left>fence on the S side (track in the N corner)</td>
</tr>
<tr>
<td nowrap valign=top><tt>B</tt> </td>
<td align=left>fence on the N side (track in the S corner)</td>
</tr>
<tr>
<td nowrap valign=top><tt>C</tt> </td>
<td align=left>on snow or desert</td>
</tr>
<tr>
<td nowrap valign=top><tt>D</tt> </td>
<td align=left>on grass with fence and shore or water on the free halftile</td>
</tr>
<tr>
<td nowrap valign=top><tt>E</tt> </td>
<td align=left>higher part on foundation with snow, lower without snow</td>
</tr>
</table>
</li>
<li>m5 bit 7 clear: railway track
<ul>
<li>m5 bits 5..0: track layout: bit set = track present:
<table>
<tr>
<td nowrap valign=top>bit 0: </td>
<td align=left>in the X direction</td>
</tr>
<tr>
<td nowrap valign=top>bit 1: </td>
<td align=left>in the Y direction</td>
</tr>
<tr>
<td nowrap valign=top>bit 2: </td>
<td align=left>in the north corner (direction W-E)</td>
</tr>
<tr>
<td nowrap valign=top>bit 3: </td>
<td align=left>in the south corner (direction W-E)</td>
</tr>
<tr>
<td nowrap valign=top>bit 4: </td>
<td align=left>in the west corner (direction N-S)</td>
</tr>
<tr>
<td nowrap valign=top>bit 5: </td>
<td align=left>in the east corner (direction N-S)</td>
</tr>
</table>
</li>
<li>m5 bit 6 set = with signals:<BR>
There are at most 4 signals on a tile. The signals 0..3 belong to the directions:
<table>
<tr>
<td></td>
<td>Track <tt>0</tt> (X) </td>
<td>Track <tt>1</tt> (Y) </td>
<td>Track <tt>2</tt> (north) </td>
<td>Track <tt>3</tt> (south) </td>
<td>Track <tt>4</tt> (west) </td>
<td>Track <tt>5</tt> (east)</td>
</tr>
<tr>
<td align=left>Signal <tt>0</tt> </td>
<td></td>
<td></td>
<td></td>
<td>west</td>
<td></td>
<td>south</td>
</tr>
<tr>
<td align=left>Signal <tt>1</tt> </td>
<td></td>
<td></td>
<td></td>
<td>east</td>
<td></td>
<td>north</td>
</tr>
<tr>
<td align=left>Signal <tt>2</tt> </td>
<td>south-west</td>
<td>north-west</td>
<td>west</td>
<td></td>
<td>south</td>
<td></td>
</tr>
<tr>
<td align=left>Signal <tt>3</tt> </td>
<td>north-east</td>
<td>south-east</td>
<td>east</td>
<td></td>
<td>north</td>
<td></td>
</tr>
</table>
<ul>
<li>m2 bit 6: Signal 0 and 1: set = semaphore signals, clear = light signals</li>
<li>m2 bit 2: Signal 2 and 3: set = semaphore signals, clear = light signals</li>
<li>m2 bits 5..4: type of signal 0 and 1 (same values as m2 bits 1..0)</li>
<li>m2 bits 1..0: type of signal 2 and 3
<table>
<tr>
<td nowrap="nowrap" valign="top"><tt>00</tt>: </td>
<td align="left">normal signals</td>
</tr>
<tr>
<td nowrap="nowrap" valign="top"><tt>01</tt>: </td>
<td align="left">pre-signals</td>
</tr>
<tr>
<td nowrap="nowrap" valign="top"><tt>10</tt>: </td>
<td align="left">exit-signals</td>
</tr>
<tr>
<td nowrap="nowrap" valign="top"><tt>11</tt>: </td>
<td align="left">combo-signals</td>
</tr>
</table>
</li>
<li>m3 bits 7..4: bit set = signal 3..0 present</li>
<li>m4 bits 7..4: bit clear = signal 3..0 shows red</li>
</ul>
</li>
</ul>
</li>
<li>m5 bit 7 set, bit 6 clear: checkpoint
<ul>
<li>m2: index into the array of waypoints.</li>
<li>m5 bit 0:
<table>
<tr>
<td><tt>0</tt> </td>
<td>in X direction</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>in Y direction</td>
</tr>
</table>
</li>
</ul>
</li>
<li>m5 bit 7 set, bit 6 set: railway depot
<ul>
<li>m5 bits 1..0: exit towards
<table>
<tr>
<td><tt>0</tt> </td>
<td>NE</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>SE</td>
</tr>
<tr>
<td><tt>2</tt> </td>
<td>SW</td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>NW</td>
</tr>
</table>
</li>
</ul>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class2"><tt> 2</tt></a></strong></td>
<td><strong>Roads</strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m3 bit 7 set = on snow or desert</li>
<li>m7 bits 7..5: present road types
<table>
<tr>
<td>bit 0 </td>
<td>normal road</td>
</tr>
<tr>
<td>bit 1 </td>
<td>tram</td>
</tr>
<tr>
<td>bit 2 </td>
<td>reserved</td>
</tr>
</table>
</li>
<li>m5 bits 7 clear: road or level-crossing
<ul>
<li>m2: Index into the array of towns, 0 for non-town roads</li>
<li>m3 bits 6..4:
<table>
<tr>
<td><tt>0</tt> </td>
<td>on bare land</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>on grass</td>
</tr>
<tr>
<td><tt>2</tt> </td>
<td>paved</td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>with streetlights</td>
</tr>
<tr>
<td><tt>5</tt> </td>
<td>tree-lined</td>
</tr>
<tr>
<td><tt>6</tt> </td>
<td>on grass with road works</td>
</tr>
<tr>
<td><tt>7</tt> </td>
<td>paved with road works</td>
</tr>
</table>
</li>
<li>m5 bits 3..0: <a href="#OwnershipInfo">owner</a> of road type 1 (tram); OWNER_NONE (<tt>10</tt>) is stored as OWNER_TOWN (<tt>0F</tt>)
<li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road type 2 (reserved)
<li>m5 bit 6 clear: road
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
<li>m3 bits 3..0: counter for the roadworks</li>
<li>m4 bits 3..0: road layout road type 0 (normal road): bit set = road piece present:
<table>
<tr>
<td align=left>bit 0: </td>
<td>NW piece</td>
</tr>
<tr>
<td align=left>bit 1: </td>
<td>SW piece</td>
</tr>
<tr>
<td align=left>bit 2: </td>
<td>SE piece</td>
</tr>
<tr>
<td align=left>bit 3: </td>
<td>NE piece</td>
</tr>
</table>
</li>
<li>m4 bits 7..4: road layout road type 1 (tram)</li>
<li>m6 bits 5..2: road layout road type 2 (reserved)</li>
<li>m5 bits 5..4: bits to disallow vehicles to go a specific direction
<table>
<tr>
<td align=left>bit 0: </td>
<td>set = disallow driving in south-west or south-east direction</td>
</tr>
<tr>
<td align=left>bit 1: </td>
<td>set = disallow driving in north-west or north-east direction</td>
</tr>
</table>
</li>
</ul>
</li>
<li>m5 bit 6 set: level crossing
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the railway track</li>
<li>m3 bits 3..0: <a href="#TrackType">railway track type</a></li>
<li>m4 bit 6: direction
<table>
<tr>
<td align=left><tt>0</tt> </td>
<td align=left>road in the X direction, rail in Y</td>
</tr>
<tr>
<td align=left><tt>1</tt> </td>
<td align=left>road in the Y direction, rail in X</td>
</tr>
</table>
</li>
<li>m4 bit 5: set if crossing lights are on</li>
<li>m4 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
</ul>
</li>
</ul>
</li>
<li>m5 bit 7 set, bit 6 clear: road depot
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the depot</li>
<li>m5 bits 3..0: exit towards:
<table>
<tr>
<td><tt>0</tt> </td>
<td>NE</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>SE</td>
</tr>
<tr>
<td><tt>2</tt> </td>
<td>SW</td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>NW</td>
</tr>
</table>
</li>
</ul>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class3"><tt> 3</tt></a></strong></td>
<td><strong>Town building </strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1 : Random bits <a href="#newhouses">(newhouses)</a> </li>
<li>m2 : index into the array of towns</li>
<li>m3 bit 7 :
<ul>
<li> set : House is complete
<ul>
<li>m5 : year of house construction (relative to 1920); clamped to 0..255 (1920..2175)</li>
</ul>
</li>
<li> clear : House is in construction
<ul>
<li>m5 bits 7..5 : free</li>
<li>m5 bits 4..3 : construction stage</li>
<li>m5 bits 2..0 : construction counter</li>
</ul>
</li>
</ul>
<li>m3 bit 6 : bit 8 of house type (m4), allowing 512 different types.</li>
<li>m3 bit 5 : bit 6 of current animation frame (see m6)</li>
<li>m3 bits 4..0 : triggers activated <a href="#newhouses">(newhouses)</a></li>
<li>m4 : <a href="landscape_externals.html">town building type</a> (with m3[6] bit)</li>
<li>m5 : see m3 bit 7</li>
<li>m6 :
<ul>
<li>If <a href="#newhouses">newhouses</a> is activated
<ul>
<li>bits 7..2 : Current animation frame (bits 5..0); bit 6 in m3</li>
</ul>
</li>
<li>Standard behaviour
<ul>
<li>bits 7..2 : lift position (for houses type 04 and 05)</li>
</ul>
</li>
<li>bits 1..0 : tropic zone specifier</li>
</ul>
</li>
<li>m7 :
<ul>
<li>If <a href="#newhouses">newhouses</a> is activated
<ul>
<li>Periodic processing time remaining</li>
</ul>
</li>
<li>Standard behaviour (only for houses type 04 and 05)
<ul>
<li>bits 7..4 : free</li>
<li>bits 3..1 : lift destination. Values can be 0..6, except 1.<br>
So the building has 6 effective floors. This is due to the fact that the first floor is 2 'normal' floors high.<br>
One 'normal' floor has a height of 6 lift positions.
</li>
<li>bit 0 : Lift has destination when set</li>
</ul>
</li>
</ul>
</li>
</ul>
<small><a name="newhouses">Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).<br>
It allows the replacement of the properties as well as the graphics of houses in the game.<br>
To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.<br>
110 is the count of standard houses. So above 110 means there is a new definition of at least one house</small>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class4"><tt> 4 </tt></a></strong></td>
<td><strong>Trees </strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> (normally <tt>10</tt>)</li>
<li>m2 bits 7..6: ground density
<li>m2 bits 5..4: ground
<table>
<tr>
<td align=left><tt>0</tt> </td>
<td>on grass</td>
</tr>
<tr>
<td align=left><tt>1</tt> </td>
<td>on rough land (density must be 3)</td>
</tr>
<tr>
<td align=left><tt>2</tt> </td>
<td>on snow or desert</td>
</tr>
<tr>
<td align=left><tt>3</tt> </td>
<td>on shore (density must be 3)</td>
</tr>
</table>
</li>
<li>m2 bits 3..0: update counter, incremented on every periodic processing.<br>
on wraparound the growth status is updated (or, if it's <tt>3</tt>, a random action is taken)</li>
<li>m3 bits 7..0: type of trees:
<table>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>0B</tt> </td>
<td align=left>temperate climate trees</td>
</tr>
<tr>
<td nowrap valign=top><tt>0C</tt>..<tt>13</tt> </td>
<td align=left>sub-arctic climate trees</td>
</tr>
<tr>
<td nowrap valign=top><tt>14</tt>..<tt>1A</tt> </td>
<td align=left>rainforest trees</td>
</tr>
<tr>
<td nowrap valign=top><tt>1B</tt> </td>
<td align=left>cactus plants</td>
</tr>
<tr>
<td nowrap valign=top><tt>1C</tt>..<tt>1F</tt> </td>
<td align=left>sub-tropical climate, non-rainforest, non-desert trees</td>
</tr>
<tr>
<td nowrap valign=top><tt>20</tt>..<tt>28</tt> </td>
<td align=left>toyland trees</td>
</tr>
</table>
<small>Note: the actually displayed set of trees depends on both type and number of trees</small>
</li>
<li>m4 bits 7..5: type of hedge on the SW border of the tile (1 through 6, or 0=none)</li>
<li>m4 bits 4..2: type of hedge on the SE border of the tile (1 through 6, or 0=none)</li>
<li>m5 bits 7..6: number of trees minus one</li>
<li>m5 bits 2..0: growth status:
<table border="0">
<tr>
<td><tt>0</tt>..<tt>2</tt> </td>
<td>one of trees is growing </td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>all trees are fully grown </td>
</tr>
<tr>
<td><tt>4</tt>..<tt>6</tt> </td>
<td>one of trees is withering </td>
</tr>
</table>
</li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class5"><tt> 5</tt></a></strong></td>
<td><strong>Station tiles</strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the station</li>
<li>m2: index into the array of stations</li>
<li>m3 bits 7..4: persistent random data for newstations</li>
<li>m3 bits 3..0: <a href="#TrackType">track type</a> for railway stations</li>
<li>m3 bits 2..0: present road types for road stops</li>
<li>m3 bits 1..0: water class for buoys and water part of docks</li>
<li>m4: custom station id; 0 means standard graphics</li>
<li>m5: graphics index (range from 0..255 for each station type):
<table>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>07</tt> </td>
<td align=left>railway station
<table>
<tr>
<td><tt>00</tt>..<tt>01</tt> </td>
<td align=left>open platform</td>
</tr>
<tr>
<td><tt>02</tt>..<tt>03</tt> </td>
<td align=left>open platform with station building</td>
</tr>
<tr>
<td><tt>04</tt>....<tt>07</tt> </td>
<td align=left>roofed platform</td>
</tr>
<tr>
<td colspan=2>bit 0: clear = in X direction, set = in Y direction</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>8F</tt></td>
<td align=left>all airports</td>
</tr>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>05</tt> </td>
<td align=left>road stops:
<table>
<tr>
<td><tt>00</tt> </td>
<td align=left>exit towards NE</td>
</tr>
<tr>
<td><tt>01</tt> </td>
<td align=left>exit towards SE</td>
</tr>
<tr>
<td><tt>02</tt> </td>
<td align=left>exit towards SW</td>
</tr>
<tr>
<td><tt>03</tt> </td>
<td align=left>exit towards NW</td>
</tr>
<tr>
<td><tt>04</tt> </td>
<td align=left>drive through X</td>
</tr>
<tr>
<td><tt>05</tt> </td>
<td align=left>drive through Y</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>05</tt> </td>
<td align=left>ship dock
<table>
<tr>
<td><tt>00</tt> </td>
<td align=left>SW coast part</td>
</tr>
<tr>
<td><tt>01</tt> </td>
<td align=left>NW coast part</td>
</tr>
<tr>
<td><tt>02</tt> </td>
<td align=left>NE coast part</td>
</tr>
<tr>
<td><tt>03</tt> </td>
<td align=left>SE coast part</td>
</tr>
<tr>
<td><tt>04</tt> </td>
<td align=left>X direction water part</td>
</tr>
<tr>
<td><tt>05</tt> </td>
<td align=left>Y direction water part</td>
</tr>
</table>
</td>
</tr>
</table>
</li>
<li>m6 bits 5..3: the station type (rail, airport, truck, bus, oilrig, dock, buoy)</li>
<li>m6 bit 2: 1 when a drive through road stop is built over a town owned road, otherwise 0</li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
<li>m7: animation frame</li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class6"><tt> 6 </tt></a></strong></td>
<td><strong>Water</strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> (for sea, rivers, and coasts normally <tt>11</tt>)</li>
<li>m3 bits 1..0 : Water class (sea, canal or river)
<li>m4: Random data for canal or river tiles</li>
<li>m5: tile type:
<table>
<tr>
<td nowrap valign=top><tt>00</tt> </td>
<td align=left>water, canal or river</td>
</tr>
<tr>
<td nowrap valign=top><tt>01</tt> </td>
<td align=left>coast or riverbank</td>
</tr>
<tr>
<td nowrap valign=top><tt>10</tt>..<tt>1B</tt> </td>
<td align=left>canal locks
<table>
<tr>
<td nowrap valign=top><tt>10</tt> </td>
<td align=left>middle part, (SW-NE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>11</tt> </td>
<td align=left>middle part, (NW-SE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>12</tt> </td>
<td align=left>middle part, (NE-SW direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>13</tt> </td>
<td align=left>middle part, (SE-NW direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>14</tt> </td>
<td align=left>lower part, (SW-NE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>15</tt> </td>
<td align=left>lower part, (NW-SE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>16</tt> </td>
<td align=left>lower part, (NE-SW direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>17</tt> </td>
<td align=left>lower part, (SE-NW direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>18</tt> </td>
<td align=left>upper part, (SW-NE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>19</tt> </td>
<td align=left>upper part, (NW-SE direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>1A</tt> </td>
<td align=left>upper part, (NE-SW direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>1B</tt> </td>
<td align=left>upper part, (SE-NW direction)</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>80</tt>..<tt>83</tt> </td>
<td align=left>ship depots
<table>
<tr>
<td nowrap valign=top><tt>80</tt> </td>
<td align=left>ship depot, NE part (X direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>81</tt> </td>
<td align=left>ship depot, SW part (X direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>82</tt> </td>
<td align=left>ship depot, NW part (Y direction)</td>
</tr>
<tr>
<td nowrap valign=top><tt>83</tt> </td>
<td align=left>ship depot, SE part (Y direction)</td>
</tr>
</table>
</td>
</tr>
</table>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class7"><tt> 7 </tt></a></strong></td>
<td><strong>Void </strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>Tiles of this class form an invisible, one tile wide border at the south (bottom) edges of the map,<br>
so as to protect several algorithms from the consequences of a wraparound at the edges.
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class8"><tt> 8</tt></a></strong></td>
<td><strong>Industry tile </strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1 bit 7: clear = under construction
<ul>
<li>m1 bits 3..2: construction counter, for buildings under construction incremented on every periodic tile processing</li>
<li>m1 bits 1..0: stage of construction (<tt>3</tt> = completed), incremented when the construction counter wraps around<br>
the meaning is different for some animated tiles which are never under construction (types <tt>01</tt>, <tt>1E</tt>..<tt>20</tt>, <tt>30</tt>, <tt>58</tt>; see above)</li>
</ul>
</li>
<li>m2: index into the array of industries</li>
<li>m3: animation state</li>
<li>m4: animation loop</li>
<li>m5: type (plus m6 bit 2):<br>
<small>(note: this is not the same as the industry type, which is stored in the array of industries)</small>
<table>
<tr>
<td nowrap valign=top><tt>00</tt>..<tt>06</tt> </td>
<td align=left>coal mine
<table>
<tr>
<td nowrap valign=top><tt>00</tt> </td>
<td align=left>wheel tower when not animated</td>
</tr>
<tr>
<td nowrap valign=top><tt>01</tt> </td>
<td align=left>wheel tower when animated<br>
animation state in m3 bits 5..0; m3 bit 6 set = sound already generated</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>07</tt>..<tt>0A</tt> </td>
<td align=left>power station
<table>
<tr>
<td nowrap valign=top><tt>08</tt> </td>
<td align=left>chimney</td>
</tr>
<tr>
<td nowrap valign=top><tt>0A</tt> </td>
<td align=left>transformer; animation progress in m3(valid range <tt>0</tt>..<tt>7</tt>)</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>0B</tt>..<tt>0F</tt> </td>
<td align=left>sawmill</td>
</tr>
<tr>
<td nowrap valign=top><tt>10</tt>..<tt>11</tt> </td>
<td align=left>forest
<table>
<tr>
<td nowrap valign=top><tt>11</tt> </td>
<td align=left>trees cut down</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>12</tt>..<tt>17</tt> </td>
<td align=left>oil refinery</td>
</tr>
<tr>
<td nowrap valign=top><tt>18</tt>..<tt>1C</tt> </td>
<td align=left>oil rig</td>
</tr>
<tr>
<td nowrap valign=top><tt>1D</tt>..<tt>20</tt> </td>
<td align=left>oil wells
<table>
<tr>
<td nowrap valign=top><tt>1D</tt> </td>
<td align=left>not animated</td>
</tr>
<tr>
<td nowrap valign=top><tt>1E</tt>..<tt>20</tt> </td>
<td align=left>various stages of animation; progress of animation in m3</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>21</tt>..<tt>26</tt> </td>
<td align=left>farm</td>
</tr>
<tr>
<td nowrap valign=top><tt>27</tt>..<tt>2A</tt> </td>
<td align=left>factory (temperate climate)</td>
</tr>
<tr>
<td nowrap valign=top><tt>2B</tt>..<tt>2E</tt> </td>
<td align=left>printing works</td>
</tr>
<tr>
<td nowrap valign=top><tt>2F</tt>..<tt>33</tt> </td>
<td align=left>copper ore mine
<table>
<tr>
<td nowrap valign=top><tt>2F</tt> </td>
<td align=left>wheel tower when not animated</td>
</tr>
<tr>
<td nowrap valign=top><tt>30</tt> </td>
<td align=left>wheel tower when animated; animation state in m3 bits 5..0; m3 bit 6 set = sound already generated</td>
</tr>
<tr>
<td nowrap valign=top><tt>31</tt> </td>
<td align=left>chimney</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>34</tt>..<tt>39</tt> </td>
<td align=left>steel mill</td>
</tr>
<tr>
<td nowrap valign=top><tt>3A</tt>..<tt>3B</tt> </td>
<td align=left>bank (temperate climate)</td>
</tr>
<tr>
<td nowrap valign=top><tt>3C</tt>..<tt>3F</tt> </td>
<td align=left>food processing plant</td>
</tr>
<tr>
<td nowrap valign=top><tt>40</tt>..<tt>47</tt> </td>
<td align=left>paper mill</td>
</tr>
<tr>
<td nowrap valign=top><tt>48</tt>..<tt>58</tt> </td>
<td align=left>gold mine
<table>
<tr>
<td nowrap valign=top><tt>4F</tt> </td>
<td align=left>wheel tower when not animated</td>
</tr>
<tr>
<td nowrap valign=top><tt>58</tt> </td>
<td align=left>wheel tower when animated; animation state in m3 bits 5..0; m3 bit 6 set = sound already generated</td>
</tr>
</table></td>
</tr>
<tr>
<td nowrap valign=top><tt>59</tt>..<tt>5A</tt> </td>
<td align=left>bank (sub-arctic or sub-tropical climate)</td>
</tr>
<tr>
<td nowrap valign=top><tt>5B</tt>..<tt>63</tt> </td>
<td align=left>diamond mine</td>
</tr>
<tr>
<td nowrap valign=top><tt>64</tt>..<tt>73</tt> </td>
<td align=left>iron ore mine</td>
</tr>
<tr>
<td nowrap valign=top><tt>74</tt></td>
<td align=left>fruit plantation</td>
</tr>
<tr>
<td nowrap valign=top><tt>75</tt></td>
<td align=left>rubber plantation</td>
</tr>
<tr>
<td nowrap valign=top><tt>76</tt>..<tt>77</tt> </td>
<td align=left>water supply</td>
</tr>
<tr>
<td nowrap valign=top><tt>78</tt></td>
<td align=left>water tower</td>
</tr>
<tr>
<td nowrap valign=top><tt>79</tt>..<tt>7C</tt> </td>
<td align=left>factory (sub-tropical climate)</td>
</tr>
<tr>
<td nowrap valign=top><tt>7D</tt>..<tt>80</tt> </td>
<td align=left>lumber mill</td>
</tr>
<tr>
<td nowrap valign=top><tt>81</tt>..<tt>82</tt> </td>
<td align=left>candyfloss forest
<table>
<tr>
<td nowrap valign=top><tt>82</tt> </td>
<td align=left>candyfloss 'trees' cut down</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>83</tt>..<tt>86</tt> </td>
<td align=left>sweet factory</td>
</tr>
<tr>
<td nowrap valign=top><tt>87</tt>..<tt>88</tt> </td>
<td align=left>battery farm
<table>
<tr>
<td nowrap valign=top><tt>88</tt> </td>
<td align=left>batteries 'reaped'</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>89</tt></td>
<td align=left>cola wells</td>
</tr>
<tr>
<td nowrap valign=top><tt>8A</tt>..<tt>8D</tt> </td>
<td align=left>toy shop</td>
</tr>
<tr>
<td nowrap valign=top><tt>8E</tt>..<tt>93</tt> </td>
<td align=left>toy factory
<table>
<tr>
<td nowrap valign=top><tt>8F</tt> </td>
<td align=left>Animated part; animation state in m3 (valid range <tt>00</tt>..<tt>31</tt>)<br>
Tile animation is started (m4 zeroed) on the periodic processing.<br>
While the animation is in progress, m4 holds the number
of animation cycles that have already taken place.<br>
when this number reaches 8 the animation is stopped.</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>94</tt>..<tt>9B</tt> </td>
<td align=left>plastic fountains (various stages of cyclic animation)</td>
</tr>
<tr>
<td nowrap valign=top><tt>9C</tt>..<tt>9F</tt> </td>
<td align=left>fizzy drink factory</td>
</tr>
<tr>
<td nowrap valign=top><tt>A0</tt>..<tt>A3</tt> </td>
<td align=left>bubble generator
<table>
<tr>
<td nowrap valign=top><tt>A1</tt> </td>
<td align=left>generators</td>
</tr>
<tr>
<td nowrap valign=top><tt>A2</tt> </td>
<td align=left>bubble capture facility; animation state in m3 (valid range <tt>00</tt>..<tt>27</tt>)</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>A4</tt>..<tt>A6</tt> </td>
<td align=left>toffee quarry
<table>
<tr>
<td nowrap valign=top><tt>A5</tt> </td>
<td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>45</tt>)</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>A7</tt>..<tt>AE</tt> </td>
<td align=left>sugar mine
<table>
<tr>
<td nowrap valign=top><tt>AE</tt> </td>
<td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>5F</tt>)</td>
</tr>
</table>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>AF</tt>..<tt>1FF</tt> </td>
<td align=left>NewGRF industries industry</td>
</tr>
</table>
</li>
<li>m6 bits 5..3: random triggers (NewGRF)</li>
<li>m6 bit 2: bit 8 of type (see m5)</li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
<li>m7: random bits (NewGRF)</li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="Class9"><tt> 9</tt></a></strong></td>
<td><strong>Tunnel / bridge</strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a></li>
<li>m2 bits 7..4: see bridge ramp</li>
<li>m3 bits 3..0: <a href="#TrackType">track type</a> for railway</li>
<li>m3 bits 2..0: present road types for road</li>
<li>m4 bit 7 set = on snow or desert</li>
<li>m5 bits 7 clear: tunnel entrance/exit</li>
<li>m5 bit 7 set: bridge ramp
<ul>
<li>m2 bits 7..4: <a name="BridgeType">bridge type</a>:
<table>
<tr>
<th align=left>Type </th>
<th align=left>Max. speed (mph) </th>
<th align=left>Description</th>
</tr>
<tr>
<td nowrap valign=top><tt>0</tt> </td>
<td align=center>20</td>
<td align=left>wooden</td>
</tr>
<tr>
<td nowrap valign=top><tt>1</tt> </td>
<td align=center>30</td>
<td align=left>concrete</td>
</tr>
<tr>
<td nowrap valign=top><tt>2</tt> </td>
<td align=center>40</td>
<td align=left>girder, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>3</tt> </td>
<td align=center>50</td>
<td align=left>suspension, concrete</td>
</tr>
<tr>
<td nowrap valign=top><tt>4</tt> </td>
<td align=center>60</td>
<td align=left>suspension, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>5</tt> </td>
<td align=center>70</td>
<td align=left>suspension, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>6</tt> </td>
<td align=center>100</td>
<td align=left>cantilever, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>7</tt> </td>
<td align=center>130</td>
<td align=left>cantilever, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>8</tt> </td>
<td align=center>150</td>
<td align=left>cantilever, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>9</tt> </td>
<td align=center>160</td>
<td align=left>girder, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>A</tt> </td>
<td align=center>200</td>
<td align=left>tubular, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>B</tt> </td>
<td align=center>320</td>
<td align=left>tubular, steel</td>
</tr>
<tr>
<td nowrap valign=top><tt>C</tt> </td>
<td align=center>380</td>
<td align=left>tubular, silicon</td>
</tr>
</table>
</li>
</ul>
</li>
<li>m5 bits 3..2: transport type
<table>
<tr>
<td><tt>0</tt> </td>
<td>railway</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>road</td>
</tr>
</li>
<li>m5 bits 1..0: direction onto the bridge / out of the tunnel
<table>
<tr>
<td><tt>0</tt> </td>
<td>NE</td>
</tr>
<tr>
<td><tt>1</tt> </td>
<td>SE</td>
</tr>
<tr>
<td><tt>2</tt> </td>
<td>SW</td>
</tr>
<tr>
<td><tt>3</tt> </td>
<td>NW</td>
</tr>
</table>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr bgcolor="#CCCCCC">
<td valign=top nowrap><strong><a name="ClassA"><tt> A</tt></a></strong></td>
<td><strong><tt>Unmovables</tt></strong></td>
</tr>
<tr>
<td valign=top nowrap> </td>
<td>
<ul>
<li>m1: <a href="#OwnershipInfo">owner</a> of the object (for lighthouses and transmitters normally <tt>10</tt>)</li>
<li>m2: see company statue
<li>m5: tile type:
<table>
<tr>
<td nowrap valign=top><tt>00</tt> </td>
<td align=left>transmitter</td>
</tr>
<tr>
<td nowrap valign=top><tt>01</tt> </td>
<td align=left>lighthouse</td>
</tr>
<tr>
<td nowrap valign=top><tt>02</tt> </td>
<td align=left>company statue
<ul>
<li>m2: TownID on which the statue is built in</li>
</ul>
</td>
</tr>
<tr>
<td nowrap valign=top><tt>03</tt> </td>
<td align=left>company-owned land</td>
</tr>
<tr>
<td nowrap valign=top><tt>80</tt>..<tt>93</tt> </td>
<td align=left>company headquarters (5 sets of 4 tiles each, updated quarterly depending on the company performance)</td>
</tr>
</table>
</li>
<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
</ul>
</td>
</tr>
<tr>
<td colspan=2>Classes <tt>B</tt> through <tt>F</tt> are reserved. The presence
of a tile in one of the reserved classes will crash OTTD.</td>
</tr>
</table>
<hr>
Original Copyright © 2003 by Marcin Grzegorczyk for TTDLX.<br>
Transport Tycoon and Transport Tycoon Deluxe are Copyright © by Chris Sawyer.<br>
All the other trademarks are the property of their respective owners.<br>
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