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@ -4,64 +4,90 @@
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<head>
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<meta name="Author" content="Marcin Grzegorczyk">
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<meta name="Description" content="Structure of OpenTTD (OTTD) landscape arrays">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>OpenTTD Landscape Internals</title>
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</head>
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<body>
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<h3><a name="Landscape">Landscape</a></h3>
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<p>
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For a graphical representation of the tile-layout have a look at
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<a href="landscape_grid.html">Landscape grid</a> page.
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</p>
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<p>Eight attributes (counting "<span style="font-weight: bold;">type_height</span>") hold the informations about a tile.<BR>
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These attributes are referred to as
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"<span style="font-weight: bold;">type_height</span>",
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"<span style="font-weight: bold;">m1</span>", "<span style="font-weight: bold;">m2</span>",
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"<span style="font-weight: bold;">m3</span>", "<span style="font-weight: bold;">m4</span>",
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"<span style="font-weight: bold;">m5</span>", "<span style="font-weight: bold;">m6</span>"
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and "<span style="font-weight: bold;">m7</span>".<BR>
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"<span style="font-weight: bold;">type_height</span>",
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"<span style="font-weight: bold;">m1</span>", "<span style="font-weight: bold;">m2</span>",
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"<span style="font-weight: bold;">m3</span>", "<span style="font-weight: bold;">m4</span>",
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"<span style="font-weight: bold;">m5</span>", "<span style="font-weight: bold;">m6</span>"
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and "<span style="font-weight: bold;">m7</span>".<br>
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The most important value is the class of a tile, stored in the upper 4 bits
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of the <span style="font-weight: bold;">type_height</span> attribute. The lower 4 bits are used to encode the height and
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slope data.
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</p>
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Special Attribute : <span style="font-weight: bold;">m6</span>. There are 4 bits of it that are used accross multiple tile classes<br>
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Frequently repeating patterns:
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<ul>
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<li>
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<a name = "bridge_direction">
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Bits 7..6 :
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<table border="1">
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<tr bgcolor="#CCCCCC"><td colspan="2">Presence and direction of bridge above,<br>for tiles that support this.</td></tr>
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<tr><td><tt>00</tt> </td><td>no bridge</td></tr>
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<tr><td><tt>01</tt> </td><td>Axis X (North-East)</td></tr>
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<tr><td><tt>02</tt> </td><td>Axis Y (South-West)</td></tr>
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</table>
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<li><span style="font-weight: bold;">m1</span>
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<ul>
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<li>
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<a name="WaterClass"></a>
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Bits 6..5:
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<table border="1" style="width: 30em;">
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<tr bgcolor="#CCCCCC"><td colspan="2">The type of water that is on a tile.
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<tr><td style="width: 5em;"><tt>00</tt></td><td align=left>Sea</td></tr>
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<tr><td><tt>01</tt></td><td align=left>Canal</td></tr>
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<tr><td><tt>02</tt></td><td align=left>River</td></tr>
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<tr><td><tt>03</tt></td><td align=left>Invalid, i.e. no water on this tile</td></tr>
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</table>
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Some tiles, such as houses, reuse these bits of other purposes.
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</li>
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<li>
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<a name="OwnershipInfo"></a>
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Bits 4..0:
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<table border="1" style="width: 30em;">
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<tr bgcolor="#CCCCCC"><td colspan="2">The owner of a tile can be either companies (human or AI) or "Game entities".
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<tr><td style="width: 5em;"><tt>00..0E</tt></td><td align=left>Normal companies</td></tr>
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<tr><td><tt>0F</tt></td><td align=left>a town owns the tile</td></tr>
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<tr><td><tt>10</tt></td><td align=left>nobody owns the tile</td></tr>
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<tr><td><tt>11</tt></td><td align=left>"water" owns the tile</td></tr>
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<tr><td><tt>FF</tt></td><td align=left>spectator in MP or in scenario editor</td></tr>
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</table>
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Some tiles, such as houses and industries, reuse these bits of other purposes.
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</li>
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</ul>
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</li>
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<li><span style="font-weight: bold;">m6</span>
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<ul>
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<li>
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<a name="bridge_direction"></a>
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Bits 7..6:
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<table border="1" style="width: 30em;">
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<tr bgcolor="#CCCCCC"><td colspan="2">Presence and direction of bridge above, for tiles that support this.</td></tr>
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<tr><td style="width: 5em;"><tt>00</tt></td><td>no bridge</td></tr>
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<tr><td><tt>01</tt></td><td>Axis X (North-East)</td></tr>
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<tr><td><tt>02</tt></td><td>Axis Y (South-West)</td></tr>
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</table>
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Some tiles, such as houses do not support bridges over them and use these bits for other purposes.
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</li>
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<li>
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<a name="tropic_zone"></a>
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Bits 1..0:
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<table border="1" style="width: 30em;">
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<tr bgcolor="#CCCCCC"><td colspan="2">Only meaningfull in tropic climate. It contains the definition of the available zones</td></tr>
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<tr><td style="width: 5em;"><tt>00</tt></td><td>normal</td></tr>
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<tr><td><tt>01</tt></td><td>desert</td></tr>
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<tr><td><tt>02</tt></td><td>rain forest</td></tr>
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</table>
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In any other climate these 2 bits are theoretically free of use, however using them does not seem useful.
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</li>
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</ul>
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</li>
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<li>
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<a name = "tropic_zone">
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Bits 1..0 :
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<table border="1">
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<tr bgcolor="#CCCCCC"><td colspan="2">Only meaningfull in tropic climate.<br>It contains the definition of the available zones</td></tr>
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<tr><td><tt>00</tt> </td><td>normal</td></tr>
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<tr><td><tt>01</tt> </td><td>desert</td></tr>
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<tr><td><tt>02</tt> </td><td>rain forest</td></tr>
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</table>
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In any other climate, those 2 bits are free of use.
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<li><span style="font-weight: bold;">m7:</span><br>
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Animation frame/state. Used for houses, industries, objects and stations.
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</li>
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</ul>
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<p>
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For a graphical representation of the tile-layout have a look at
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<a href="landscape_grid.html">Landscape grid</a> page.
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</p>
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The <a name="OwnershipInfo">owner of a tile</a>, as frequently associated with attribute m1 bits 4..0,
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can be either companies (human or AI) or "Game entities".
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They are identified using:
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<table border="1">
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<tr><td><tt>00..0E</tt> </td><td align=left>Normal companies</td></tr>
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<tr><td><tt>0F</tt> </td><td align=left>a town owns the tile</td></tr>
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<tr><td><tt>10</tt> </td><td align=left>nobody owns the tile</td></tr>
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<tr><td><tt>11</tt> </td><td align=left>"water" owns the tile</td></tr>
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<tr><td><tt>FF</tt> </td><td align=left>spectator in MP or in scenario editor</td></tr>
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</table>
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<p>OTTD's class-specific periodic tile processing routine is called once every +256 ticks for each tile.</p>
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@ -708,7 +734,7 @@
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</ul>
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</li>
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</ul>
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<small><a name="newhouses">Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).<br>
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<small><a name="newhouses"></a>Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).<br>
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It allows the replacement of the properties as well as the graphics of houses in the game.<br>
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To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.<br>
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110 is the count of standard houses. So above 110 means there is a new definition of at least one house</small>
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@ -1525,6 +1551,7 @@
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<td><tt>2</tt> </td>
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<td>water</td>
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</tr>
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</table>
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</li>
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<li>m5 bits 1..0: direction onto the bridge / out of the tunnel
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<table>
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@ -1569,7 +1596,6 @@
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<li>m1 bits 6..5 : Water class (sea, canal, river or land)
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<li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the object (for lighthouses and transmitters normally <tt>10</tt>)</li>
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<li>m2: index into the array of objects
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<li>m3: animation counter
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<li>m5: tile type:
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<table>
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<tr>
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@ -1600,6 +1626,7 @@
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</li>
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<li>m6 bits 7..6 : Possibility of a bridge above, in the <a href="#bridge_direction">direction specified</a></li>
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<li>m6 bits 1..0 : <a href="#tropic_zone">Tropic zone definition</a></li>
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<li>m7: animation counter
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</ul>
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</td>
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</tr>
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rubidium
14 years ago