docs/landscape.html

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   5  <meta name="Author" content="Marcin Grzegorczyk">
   6  <meta name="Description" content="Structure of OpenTTD (OTTD) landscape arrays">
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   8  <title>OpenTTD Landscape Internals</title>
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  11 <body>
  12
  13  <h3><a name="Landscape">Landscape</a></h3>
  14  <p>
  15   For a graphical representation of the tile-layout have a look at
  16   <a href="landscape_grid.html">Landscape grid</a> page.
  17  </p>
  18  <p>Nine attributes (counting &quot;<span style="font-weight: bold;">type</span>&quot; and
  19   &quot;<span style="font-weight: bold;">height</span>&quot;) hold the information about a tile.<BR>
  20   These attributes are referred to as
  21   &quot;<span style="font-weight: bold;">type</span>",
  22   &quot;<span style="font-weight: bold;">height</span>",
  23   &quot;<span style="font-weight: bold;">m1</span>&quot;, &quot;<span style="font-weight: bold;">m2</span>&quot;,
  24   &quot;<span style="font-weight: bold;">m3</span>&quot;, &quot;<span style="font-weight: bold;">m4</span>&quot;,
  25   &quot;<span style="font-weight: bold;">m5</span>&quot;, &quot;<span style="font-weight: bold;">m6</span>&quot;
  26   and "<span style="font-weight: bold;">m7</span>".<br>
  27   The most important value is the class of a tile, stored in the upper 4 bits
  28   of the <span style="font-weight: bold;">type</span> attribute.
  29  </p>
  30
  31  Frequently repeating patterns:
  32  <ul>
  33   <li><span style="font-weight: bold;">type</span>
  34    <ul>
  35     <li>
  36      <a name="type"></a>
  37      Bits 7..4:
  38      <table border="1" style="width: 30em;">
  39       <tr bgcolor="#CCCCCC"><td colspan="2">The tile type.</td></tr>
  40       <tr><td style="width: 5em;"><tt>00</tt></td><td>Ground</td></tr>
  41       <tr><td><tt>01</tt></td><td>Railway tracks</td></tr>
  42       <tr><td><tt>02</tt></td><td>Roads</td></tr>
  43       <tr><td><tt>03</tt></td><td>Town building</td></tr>
  44       <tr><td><tt>04</tt></td><td>Trees</td></tr>
  45       <tr><td><tt>05</tt></td><td>Station tiles</td></tr>
  46       <tr><td><tt>06</tt></td><td>Water</td></tr>
  47       <tr><td><tt>07</tt></td><td>Void</td></tr>
  48       <tr><td><tt>08</tt></td><td>Industries</td></tr>
  49       <tr><td><tt>09</tt></td><td>Tunnel / bridge</td></tr>
  50       <tr><td><tt>0A</tt></td><td>Objects</td></tr>
  51      </table>
  52     </li>
  53      Bits 3..2:
  54      <table border="1" style="width: 30em;">
  55       <tr bgcolor="#CCCCCC"><td colspan="2">Presence and direction of bridge above.</td></tr>
  56       <tr><td style="width: 5em;"><tt>00</tt></td><td>no bridge</td></tr>
  57       <tr><td><tt>01</tt></td><td>Axis X (North-East)</td></tr>
  58       <tr><td><tt>02</tt></td><td>Axis Y (South-West)</td></tr>
  59      </table>
  60     <li>
  61      <a name="tropic_zone"></a>
  62      Bits 1..0:
  63      <table border="1" style="width: 30em;">
  64       <tr bgcolor="#CCCCCC"><td colspan="2">Only meaningful in tropic climate. It contains the definition of the available zones</td></tr>
  65       <tr><td style="width: 5em;"><tt>00</tt></td><td>normal</td></tr>
  66       <tr><td><tt>01</tt></td><td>desert</td></tr>
  67       <tr><td><tt>02</tt></td><td>rain forest</td></tr>
  68      </table>
  69      In any other climate these 2 bits are theoretically free of use, however using them does not seem useful.
  70     </li>
  71    </ul>
  72   <li><span style="font-weight: bold;">m1</span>
  73    <ul>
  74     <li>
  75      <a name="WaterClass"></a>
  76       Bits 6..5:
  77      <table border="1" style="width: 30em;">
  78       <tr bgcolor="#CCCCCC"><td colspan="2">The type of water that is on a tile.
  79       <tr><td style="width: 5em;"><tt>00</tt></td><td align=left>Sea</td></tr>
  80       <tr><td><tt>01</tt></td><td align=left>Canal</td></tr>
  81       <tr><td><tt>02</tt></td><td align=left>River</td></tr>
  82       <tr><td><tt>03</tt></td><td align=left>Invalid, i.e. no water on this tile</td></tr>
  83      </table>
  84      Some tiles, such as houses, reuse these bits of other purposes.
  85     </li>
  86     <li>
  87      <a name="OwnershipInfo"></a>
  88      Bits 4..0:
  89      <table border="1" style="width: 30em;">
  90       <tr bgcolor="#CCCCCC"><td colspan="2">The owner of a tile can be either companies (human or AI) or "Game entities".
  91       <tr><td style="width: 5em;"><tt>00..0E</tt></td><td align=left>Normal companies</td></tr>
  92       <tr><td><tt>0F</tt></td><td align=left>a town owns the tile</td></tr>
  93       <tr><td><tt>10</tt></td><td align=left>nobody owns the tile</td></tr>
  94       <tr><td><tt>11</tt></td><td align=left>"water" owns the tile</td></tr>
  95       <tr><td><tt>FF</tt></td><td align=left>spectator in MP or in scenario editor</td></tr>
  96      </table>
  97      Some tiles, such as houses and industries, reuse these bits of other purposes.
  98     </li>
  99    </ul>
 100   </li>
 101   <li><span style="font-weight: bold;">m3:</span><br>
 102     <ul>
 103       <li>
 104         Bit 0: Non-flooding state.
 105       </li>
 106     </ul>
 107   <li><span style="font-weight: bold;">m4:</span><br>
 108    <a name="RoadType"></a>
 109    Road roadtype. Used for all tiles with road (road, station, tunnelbridge).
 110    <ul>
 111     <li>
 112      Bits 5..0: Road roadtype, 0x3F for no road.
 113     </li>
 114    </ul>
 115   </li>
 116   <li><span style="font-weight: bold;">m8:</span><br>
 117    <a name="TramType"></a>
 118    Tram roadtype. Used for all tiles with road (road, station, tunnelbridge).
 119    <ul>
 120     <li>
 121      Bits 11..6: Tram roadtype, 0x3F for no tram.
 122     </li>
 123    </ul>
 124   </li>
 125   <li><span style="font-weight: bold;">m8:</span><br>
 126    <ul>
 127     <li>
 128      <a name="RailType"></a>
 129      Bits 5..0: Railtype. Used for all tiles with rail (road, rail, station, tunnelbridge).
 130     </li>
 131    </ul>
 132   </li>
 133   <li><span style="font-weight: bold;">m7:</span><br>
 134    Animation frame/state. Used for houses, industries, objects and stations.
 135   </li>
 136  </ul>
 137
 138  <p>OTTD's class-specific periodic tile processing routine is called once every +256 ticks for each tile.</p>
 139
 140  <table border=1 cellpadding=3>
 141   <tr bgcolor="#0099FF">
 142    <th align=left><font color="#FFFFFF">Class</font></th>
 143    <th align=left><font color="#FFFFFF">Meaning &amp; details of encoding</font></th>
 144   </tr>
 145   <tr bgcolor="#CCCCCC">
 146    <td align=left><strong><a name="Class0"><tt> 0 </tt></a></strong></td>
 147    <td align=left>&nbsp;<strong>Ground </strong></td>
 148   </tr>
 149   <tr>
 150    <td valign=top nowrap>&nbsp;</td>
 151    <td>
 152     <ul>
 153      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the tile (normally <tt>10</tt>)</li>
 154      <li>m2: see fields</li>
 155      <li>m3 bits 7..5: type of hedge on NE border of the tile</li>
 156      <li>m3 bits 3..0: see fields</li>
 157      <li>m3 bit 4: set if the tile is covered with snow</li>
 158      <li>m4 bits 7..5: type of hedge on the SW border of the tile (1 through 6, or 0=none)</li>
 159      <li>m4 bits 4..2: same as 7..5, but for the SE border</li>
 160      <li>m5 bits 7..5: update counter, incremented on every periodic processing for tile types,
 161          other than <tt>03</tt>, <tt>07</tt>, <tt>0B</tt>, <tt>10</tt> and above.<BR>
 162          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>
 163          For snow and desert, these bits are not used, tile is updated on every periodic processing.</li>
 164      <li>m5 bits 4..2: tile type:
 165       <table>
 166        <tr>
 167         <td nowrap valign=top><tt>0</tt>&nbsp; </td>
 168         <td align=left>bare land / grass</td>
 169        </tr>
 170
 171        <tr>
 172         <td nowrap valign=top><tt>1</tt>&nbsp; </td>
 173         <td align=left>rough land (density must be 3)</td>
 174        </tr>
 175
 176        <tr>
 177         <td nowrap valign=top><tt>2</tt>&nbsp; </td>
 178         <td align=left>rocks (density must be 3)</td>
 179        </tr>
 180
 181        <tr>
 182         <td nowrap valign=top><tt>3</tt>&nbsp; </td>
 183         <td align=left>fields (density must be 3)
 184          <ul>
 185           <li>m2: index into the array of industries (farms), INVALID_INDUSTRY (0xFFFF) if farm has been removed</li>
 186           <li>m3 bits 3..0: field type (legal values: 0 through 9)</li>
 187          </ul>
 188         </td>
 189        </tr>
 190
 191        <tr>
 192         <td nowrap valign=top><tt>4</tt>&nbsp; </td>
 193         <td align=left>snow</td>
 194        </tr>
 195
 196        <tr>
 197         <td nowrap valign=top><tt>5</tt>&nbsp; </td>
 198         <td align=left>desert (density must be 1 or 3)</td>
 199        </tr>
 200       </table>
 201      </li>
 202      <li>m5 bits 1..0: density:
 203       <table>
 204        <tr>
 205         <td nowrap valign=top><tt>0</tt>&nbsp; </td>
 206         <td>bare land</td>
 207         <td></td>
 208         <td></td>
 209         <td></td>
 210         <td>1/4 snow</td>
 211         <td></td>
 212        </tr>
 213
 214        <tr>
 215         <td nowrap valign=top><tt>1</tt>&nbsp; </td>
 216         <td>1/3 grass</td>
 217         <td></td>
 218         <td></td>
 219         <td></td>
 220         <td>2/4 snow;&nbsp;</td>
 221         <td>1/2 desert</td>
 222        </tr>
 223
 224        <tr>
 225         <td nowrap valign=top><tt>2</tt>&nbsp; </td>
 226         <td>2/3 grass</td>
 227         <td></td>
 228         <td></td>
 229         <td></td>
 230         <td>3/4 snow</td>
 231         <td></td>
 232        </tr>
 233
 234        <tr>
 235         <td nowrap valign=top><tt>3</tt>&nbsp; </td>
 236         <td>full grass;&nbsp;</td>
 237         <td>rough land;&nbsp;</td>
 238         <td>rocks;&nbsp;</td>
 239         <td>fields;&nbsp;</td>
 240         <td>full snow;&nbsp;</td>
 241         <td>full desert</td>
 242        </tr>
 243       </table>
 244      </li>
 245      <li>m6 bits 4..2: type of hedge on NW border of the tile</li>
 246     </ul>
 247    </td>
 248   </tr>
 249
 250   <tr bgcolor="#CCCCCC">
 251    <td valign=top nowrap><strong><a name="Class1"><tt> 1</tt></a></strong></td>
 252    <td><strong>Railway tracks</strong></td>
 253   </tr>
 254   <tr>
 255    <td valign=top nowrap>&nbsp;</td>
 256    <td>
 257     <ul>
 258      <li>m1 bit 7: Ship docking tile status (for half-tile with water)</li>
 259      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the tile</li>
 260      <li>m2: see signals</li>
 261      <li>m3 bits 7..4: see signals</li>
 262      <li>m8 bits 5..0 = <a name="TrackType">track type</a>:
 263       <table>
 264        <tr>
 265         <td><tt>0</tt>&nbsp; </td>
 266         <td>conventional railway</td>
 267        </tr>
 268
 269        <tr>
 270         <td><tt>1</tt>&nbsp; </td>
 271         <td>electrified railway</td>
 272        </tr>
 273
 274        <tr>
 275         <td><tt>2</tt>&nbsp; </td>
 276         <td>monorail</td>
 277        </tr>
 278
 279        <tr>
 280         <td><tt>3</tt>&nbsp; </td>
 281         <td>maglev</td>
 282        </tr>
 283       </table>
 284      </li>
 285      <li>m4 bits 7..4: see signals</li>
 286      <li>m4 bits 3..0: Ground type (values with fences are not valid for depots and checkpoints)
 287       <table>
 288        <tr>
 289         <td nowrap valign=top><tt>0</tt>&nbsp; </td>
 290         <td align=left>on bare land</td>
 291        </tr>
 292
 293        <tr>
 294         <td nowrap valign=top><tt>1</tt>&nbsp; </td>
 295         <td align=left>on grass, no fences</td>
 296        </tr>
 297
 298        <tr>
 299         <td nowrap valign=top><tt>2</tt>&nbsp; </td>
 300         <td align=left>fence on the NW side</td>
 301        </tr>
 302
 303        <tr>
 304         <td nowrap valign=top><tt>3</tt>&nbsp; </td>
 305         <td align=left>fence on the SE side</td>
 306        </tr>
 307
 308        <tr>
 309         <td nowrap valign=top><tt>4</tt>&nbsp; </td>
 310         <td align=left>fences on the NW and SE sides</td>
 311        </tr>
 312
 313        <tr>
 314         <td nowrap valign=top><tt>5</tt>&nbsp; </td>
 315         <td align=left>fence on the NE side</td>
 316        </tr>
 317
 318        <tr>
 319         <td nowrap valign=top><tt>6</tt>&nbsp; </td>
 320         <td align=left>fence on the SW side</td>
 321        </tr>
 322
 323        <tr>
 324         <td nowrap valign=top><tt>7</tt>&nbsp; </td>
 325         <td align=left>fences on the NE and SW sides</td>
 326        </tr>
 327
 328        <tr>
 329         <td nowrap valign=top><tt>8</tt>&nbsp; </td>
 330         <td align=left>fence on the E side (track in the W corner)</td>
 331        </tr>
 332
 333        <tr>
 334         <td nowrap valign=top><tt>9</tt>&nbsp; </td>
 335         <td align=left>fence on the W side (track in the E corner)</td>
 336        </tr>
 337
 338        <tr>
 339         <td nowrap valign=top><tt>A</tt>&nbsp; </td>
 340         <td align=left>fence on the S side (track in the N corner)</td>
 341        </tr>
 342
 343        <tr>
 344         <td nowrap valign=top><tt>B</tt>&nbsp; </td>
 345         <td align=left>fence on the N side (track in the S corner)</td>
 346        </tr>
 347
 348        <tr>
 349         <td nowrap valign=top><tt>C</tt>&nbsp; </td>
 350         <td align=left>on snow or desert</td>
 351        </tr>
 352
 353        <tr>
 354         <td nowrap valign=top><tt>D</tt>&nbsp; </td>
 355         <td align=left>on grass with fence and shore or water on the free halftile</td>
 356        </tr>
 357
 358        <tr>
 359         <td nowrap valign=top><tt>E</tt>&nbsp; </td>
 360         <td align=left>higher part on foundation with snow, lower without snow</td>
 361        </tr>
 362       </table>
 363      </li>
 364      <li>m5 bit 7 clear: railway track
 365       <ul>
 366        <li>m5 bits 5..0: track layout: bit set = track present:
 367         <table>
 368          <tr>
 369           <td nowrap valign=top>bit 0: </td>
 370           <td align=left>in the X direction</td>
 371          </tr>
 372
 373          <tr>
 374           <td nowrap valign=top>bit 1: </td>
 375           <td align=left>in the Y direction</td>
 376          </tr>
 377
 378          <tr>
 379           <td nowrap valign=top>bit 2: </td>
 380           <td align=left>in the north corner (direction W-E)</td>
 381          </tr>
 382
 383          <tr>
 384           <td nowrap valign=top>bit 3: </td>
 385           <td align=left>in the south corner (direction W-E)</td>
 386          </tr>
 387
 388          <tr>
 389           <td nowrap valign=top>bit 4: </td>
 390           <td align=left>in the west corner (direction N-S)</td>
 391          </tr>
 392
 393          <tr>
 394           <td nowrap valign=top>bit 5: </td>
 395           <td align=left>in the east corner (direction N-S)</td>
 396          </tr>
 397         </table>
 398        </li>
 399        <li>m5 bit 6 set = with signals:<BR>
 400         There are at most 4 signals on a tile. The signals 0..3 belong to the directions:
 401         <table>
 402          <tr>
 403           <td></td>
 404           <td>Track <tt>0</tt> (X)&nbsp;</td>
 405           <td>Track <tt>1</tt> (Y)&nbsp;</td>
 406           <td>Track <tt>2</tt> (north)&nbsp;</td>
 407           <td>Track <tt>3</tt> (south)&nbsp;</td>
 408           <td>Track <tt>4</tt> (west)&nbsp;</td>
 409           <td>Track <tt>5</tt> (east)</td>
 410          </tr>
 411
 412          <tr>
 413           <td align=left>Signal <tt>0</tt>&nbsp;</td>
 414           <td></td>
 415           <td></td>
 416           <td></td>
 417           <td>west</td>
 418           <td></td>
 419           <td>south</td>
 420          </tr>
 421
 422          <tr>
 423           <td align=left>Signal <tt>1</tt>&nbsp;</td>
 424           <td></td>
 425           <td></td>
 426           <td></td>
 427           <td>east</td>
 428           <td></td>
 429           <td>north</td>
 430          </tr>
 431
 432          <tr>
 433           <td align=left>Signal <tt>2</tt>&nbsp;</td>
 434           <td>south-west</td>
 435           <td>north-west</td>
 436           <td>west</td>
 437           <td></td>
 438           <td>south</td>
 439           <td></td>
 440          </tr>
 441
 442          <tr>
 443           <td align=left>Signal <tt>3</tt>&nbsp;</td>
 444           <td>north-east</td>
 445           <td>south-east</td>
 446           <td>east</td>
 447           <td></td>
 448           <td>north</td>
 449           <td></td>
 450          </tr>
 451         </table>
 452         <ul>
 453          <li>m2 bit 7: Signal 0 and 1: set = semaphore signals, clear = light signals</li>
 454          <li>m2 bit 3: Signal 2 and 3: set = semaphore signals, clear = light signals</li>
 455          <li>m2 bits 6..4: type of signal 0 and 1 (same values as m2 bits 2..0)</li>
 456          <li>m2 bits 2..0: type of signal 2 and 3
 457           <table>
 458            <tr>
 459             <td nowrap="nowrap" valign="top"><tt>000</tt>: </td>
 460             <td align="left">normal signals</td>
 461            </tr>
 462
 463            <tr>
 464             <td nowrap="nowrap" valign="top"><tt>001</tt>: </td>
 465             <td align="left">pre-signals</td>
 466            </tr>
 467
 468            <tr>
 469             <td nowrap="nowrap" valign="top"><tt>010</tt>: </td>
 470             <td align="left">exit-signals</td>
 471            </tr>
 472
 473            <tr>
 474             <td nowrap="nowrap" valign="top"><tt>011</tt>: </td>
 475             <td align="left">combo-signals</td>
 476            </tr>
 477
 478            <tr>
 479             <td nowrap="nowrap" valign="top"><tt>100</tt>: </td>
 480             <td align="left">pbs signals</td>
 481            </tr>
 482
 483            <tr>
 484             <td nowrap="nowrap" valign="top"><tt>101</tt>: </td>
 485             <td align="left">no-entry signals</td>
 486            </tr>
 487           </table>
 488          </li>
 489
 490          <li>m3 bits 7..4: bit set = signal 3..0 present</li>
 491          <li>m4 bits 7..4: bit clear = signal 3..0 shows red</li>
 492         </ul>
 493        </li>
 494        <li>m2 bits 8..10: track reserved for pbs
 495          <table>
 496           <tr>
 497             <td><tt>0</tt>&nbsp; </td>
 498             <td>not reserved</td>
 499           </tr>
 500           <tr>
 501             <td><tt>1</tt>&nbsp; </td>
 502             <td>X direction</td>
 503           </tr>
 504           <tr>
 505             <td><tt>2</tt>&nbsp; </td>
 506             <td>Y direction</td>
 507           </tr>
 508           <tr>
 509             <td><tt>3</tt>&nbsp; </td>
 510             <td>north corner (W-E)</td>
 511           </tr>
 512           <tr>
 513             <td><tt>4</tt>&nbsp; </td>
 514             <td>south corner (W-E)</td>
 515           </tr>
 516           <tr>
 517             <td><tt>5</tt>&nbsp; </td>
 518             <td>west corner (N-S)</td>
 519           </tr>
 520           <tr>
 521             <td><tt>6</tt>&nbsp; </td>
 522             <td>east corner (N-S)</td>
 523           </tr>
 524          </table>
 525        </li>
 526        <li>m2 bit 11: opposite track is reserved, too</li>
 527       </ul>
 528      </li>
 529      <li>m5 bit 7 set, bit 6 set: railway depot
 530       <ul>
 531        <li>m2: Depot index</li>
 532        <li>m5 bits 1..0: exit towards
 533         <table>
 534          <tr>
 535           <td><tt>0</tt>&nbsp; </td>
 536           <td>NE</td>
 537          </tr>
 538
 539          <tr>
 540           <td><tt>1</tt>&nbsp; </td>
 541           <td>SE</td>
 542          </tr>
 543
 544          <tr>
 545           <td><tt>2</tt>&nbsp; </td>
 546           <td>SW</td>
 547          </tr>
 548
 549          <tr>
 550           <td><tt>3</tt>&nbsp; </td>
 551           <td>NW</td>
 552          </tr>
 553         </table>
 554        </li>
 555        <li>m5 bit 4: pbs reservation state</li>
 556       </ul>
 557      </li>
 558     </ul>
 559    </td>
 560   </tr>
 561
 562   <tr bgcolor="#CCCCCC">
 563    <td valign=top nowrap><strong><a name="Class2"><tt> 2</tt></a></strong></td>
 564    <td><strong>Roads</strong></td>
 565   </tr>
 566   <tr>
 567    <td valign=top nowrap>&nbsp;</td>
 568    <td>
 569     <ul>
 570      <li>m2: Index into the array of towns (owning town for town roads; closest town otherwise, INVALID_TOWN if there is no town or we are creating a town)</li>
 571      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of road type 1 (tram); OWNER_NONE (<tt>10</tt>) is stored as OWNER_TOWN (<tt>0F</tt>)
 572      <li>m4 bits 5..0: <a href="#RoadType">Roadtype</a></li>
 573      <li>m7 bit 5 set = on snow or desert</li>
 574      <li>m8 bits 11..6: <a href="#TramType">Tramtype</a></li>
 575      <li>m5 bits 7 clear: road or level-crossing
 576       <ul>
 577        <li>m6 bits 5..3:
 578         <table>
 579          <tr>
 580           <td><tt>0</tt>&nbsp; </td>
 581           <td>on bare land</td>
 582          </tr>
 583          <tr>
 584           <td><tt>1</tt>&nbsp; </td>
 585           <td>on grass</td>
 586          </tr>
 587          <tr>
 588           <td><tt>2</tt>&nbsp; </td>
 589           <td>paved</td>
 590          </tr>
 591          <tr>
 592           <td><tt>3</tt>&nbsp; </td>
 593           <td>with streetlights</td>
 594          </tr>
 595          <tr>
 596           <td><tt>5</tt>&nbsp; </td>
 597           <td>tree-lined</td>
 598          </tr>
 599          <tr>
 600           <td><tt>6</tt>&nbsp; </td>
 601           <td>on grass with road works</td>
 602          </tr>
 603          <tr>
 604           <td><tt>7</tt>&nbsp; </td>
 605           <td>paved with road works</td>
 606          </tr>
 607         </table>
 608        </li>
 609        <li>m5 bit 6 clear: road
 610         <ul>
 611          <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 612          <li>m7 bits 3..0: counter for the roadworks</li>
 613          <li>m5 bits 3..0: road layout road type 0 (normal road): bit set = road piece present:
 614           <table>
 615            <tr>
 616             <td align=left>bit 0: </td>
 617             <td>NW piece</td>
 618            </tr>
 619            <tr>
 620             <td align=left>bit 1: </td>
 621             <td>SW piece</td>
 622            </tr>
 623            <tr>
 624             <td align=left>bit 2: </td>
 625             <td>SE piece</td>
 626            </tr>
 627            <tr>
 628             <td align=left>bit 3: </td>
 629             <td>NE piece</td>
 630            </tr>
 631           </table>
 632          </li>
 633          <li>m3 bits 0..3: road layout road type 1 (tram)</li>
 634          <li>m5 bits 5..4: bits to disallow vehicles to go a specific direction
 635           <table>
 636            <tr>
 637             <td align=left>bit 0: </td>
 638             <td>set = disallow driving in south-west or south-east direction</td>
 639            </tr>
 640            <tr>
 641             <td align=left>bit 1: </td>
 642             <td>set = disallow driving in north-west or north-east direction</td>
 643            </tr>
 644           </table>
 645          </li>
 646         </ul>
 647        </li>
 648        <li>m5 bit 6 set: level crossing
 649         <ul>
 650          <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the railway track</li>
 651          <li>m5 bit 5: set if crossing lights are on</li>
 652          <li>m5 bit 4: pbs reservation state</li>
 653          <li>m5 bit 0: direction
 654           <table>
 655            <tr>
 656             <td align=left><tt>0</tt>&nbsp; </td>
 657             <td align=left>road in the X direction, rail in Y</td>
 658            </tr>
 659            <tr>
 660             <td align=left><tt>1</tt>&nbsp; </td>
 661             <td align=left>road in the Y direction, rail in X</td>
 662            </tr>
 663           </table>
 664          </li>
 665          <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 666          <li>m8 bits 5..0: <a href="#TrackType">railway track type</a></li>
 667         </ul>
 668        </li>
 669       </ul>
 670      </li>
 671      <li>m5 bit 7 set, bit 6 clear: road depot
 672       <ul>
 673        <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the depot</li>
 674        <li>m2: Depot index</li>
 675        <li>m5 bits 1..0: exit towards:
 676         <table>
 677          <tr>
 678           <td><tt>0</tt>&nbsp; </td>
 679           <td>NE</td>
 680          </tr>
 681
 682          <tr>
 683           <td><tt>1</tt>&nbsp; </td>
 684           <td>SE</td>
 685          </tr>
 686
 687          <tr>
 688           <td><tt>2</tt>&nbsp; </td>
 689           <td>SW</td>
 690          </tr>
 691
 692          <tr>
 693           <td><tt>3</tt>&nbsp; </td>
 694           <td>NW</td>
 695          </tr>
 696         </table>
 697        </li>
 698        <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 699       </ul>
 700      </li>
 701     </ul>
 702    </td>
 703   </tr>
 704
 705   <tr bgcolor="#CCCCCC">
 706    <td valign=top nowrap><strong><a name="Class3"><tt> 3</tt></a></strong></td>
 707    <td><strong>Town building </strong></td>
 708   </tr>
 709   <tr>
 710    <td valign=top nowrap>&nbsp;</td>
 711    <td>
 712     <ul>
 713      <li>m1 : Random bits <a href="#newhouses">(newhouses)</a> </li>
 714      <li>m2 : index into the array of towns</li>
 715      <li>m3 bit 7 :
 716       <ul>
 717        <li> set : House is complete
 718         <ul>
 719          <li>m5 : Age of house in years, clamped at 255</li>
 720         </ul>
 721        </li>
 722        <li> clear : House is in construction
 723         <ul>
 724          <li>m5 bits 7..5 : free</li>
 725          <li>m5 bits 4..3 : construction stage</li>
 726          <li>m5 bits 2..0 : construction counter</li>
 727         </ul>
 728        </li>
 729       </ul>
 730      <li>m3 bit 6 : bit 8 of house type (m4), allowing 512 different types.</li>
 731      <li>m3 bit 5 : free</li>
 732      <li>m3 bits 4..0 : triggers activated <a href="#newhouses">(newhouses)</a></li>
 733      <li>m4 : <a href="landscape_externals.html">town building type</a> (with m3[6] bit)</li>
 734      <li>m5 : see m3 bit 7</li>
 735      <li>m6 :
 736       <ul>
 737        <li>If <a href="#newhouses">newhouses</a> is activated
 738         <ul>
 739          <li>bits 7..2 : Periodic processing time remaining</li>
 740         </ul>
 741        </li>
 742        <li>Standard behaviour
 743         <ul>
 744          <li>bits 7..2 : lift position (for houses type 04 and 05)</li>
 745         </ul>
 746        </li>
 747       </ul>
 748      </li>
 749      <li>m7 :
 750       <ul>
 751        <li>If <a href="#newhouses">newhouses</a> is activated
 752         <ul>
 753          <li>Current animation frame</li>
 754         </ul>
 755        </li>
 756        <li>Standard behaviour (only for houses type 04 and 05)
 757         <ul>
 758          <li>bits 7..4 : free</li>
 759          <li>bits 3..1 : lift destination.  Values can be 0..6, except 1.<br>
 760              So the building has 6 effective floors. This is due to the fact that the first floor is 2 'normal' floors high.<br>
 761              One 'normal' floor has a height of 6 lift positions.
 762          </li>
 763          <li>bit 0 : Lift has destination when set</li>
 764         </ul>
 765        </li>
 766       </ul>
 767      </li>
 768     </ul>
 769     <small><a name="newhouses"></a>Newhouses is the name englobing a newGRF feature developed by TTDPatch devs (mainly Csaboka).<br>
 770     It allows the replacement of the properties as well as the graphics of houses in the game.<br>
 771     To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.<br>
 772     110 is the count of standard houses. So above 110 means there is a new definition of at least one house</small>
 773    </td>
 774   </tr>
 775
 776   <tr bgcolor="#CCCCCC">
 777    <td valign=top nowrap><strong><a name="Class4"><tt> 4 </tt></a></strong></td>
 778    <td><strong>Trees </strong></td>
 779   </tr>
 780   <tr>
 781    <td valign=top nowrap>&nbsp;</td>
 782    <td>
 783     <ul>
 784      <li>m1 bits 6..5: water class (sea or land)</li>
 785      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> (normally <tt>10</tt>)</li>
 786      <li>m2 bits 8..6: ground
 787       <table>
 788
 789        <tr>
 790         <td align=left><tt>0</tt>&nbsp; </td>
 791         <td>on grass</td>
 792        </tr>
 793
 794        <tr>
 795         <td align=left><tt>1</tt>&nbsp; </td>
 796         <td>on rough land (density must be 3)</td>
 797        </tr>
 798
 799        <tr>
 800         <td align=left><tt>2</tt>&nbsp; </td>
 801         <td>on snow or desert</td>
 802        </tr>
 803
 804        <tr>
 805         <td align=left><tt>3</tt>&nbsp; </td>
 806         <td>on shore (density must be 3)</td>
 807        </tr>
 808
 809        <tr>
 810         <td align=left><tt>4</tt>&nbsp; </td>
 811         <td>on snow with rough land underneath</td>
 812        </tr>
 813       </table>
 814      </li>
 815      <li>m2 bits 5..4: ground density</li>
 816      <li>m3 bits 7..0: type of trees:
 817       <table>
 818        <tr>
 819         <td nowrap valign=top><tt>00</tt>..<tt>0B</tt>&nbsp; </td>
 820         <td align=left>temperate climate trees</td>
 821        </tr>
 822
 823        <tr>
 824         <td nowrap valign=top><tt>0C</tt>..<tt>13</tt>&nbsp; </td>
 825         <td align=left>sub-arctic climate trees</td>
 826        </tr>
 827
 828        <tr>
 829         <td nowrap valign=top><tt>14</tt>..<tt>1A</tt>&nbsp; </td>
 830         <td align=left>rainforest trees</td>
 831        </tr>
 832
 833        <tr>
 834         <td nowrap valign=top><tt>1B</tt> </td>
 835         <td align=left>cactus plants</td>
 836        </tr>
 837
 838        <tr>
 839         <td nowrap valign=top><tt>1C</tt>..<tt>1F</tt>&nbsp; </td>
 840         <td align=left>sub-tropical climate, non-rainforest, non-desert trees</td>
 841        </tr>
 842
 843        <tr>
 844         <td nowrap valign=top><tt>20</tt>..<tt>28</tt>&nbsp; </td>
 845         <td align=left>toyland trees</td>
 846        </tr>
 847       </table>
 848       <small>Note: the actually displayed set of trees depends on both type and number of trees</small>
 849      </li>
 850      <li>m5 bits 7..6: number of trees minus one</li>
 851      <li>m5 bits 2..0: growth status:
 852       <table border="0">
 853        <tr>
 854         <td><tt>0</tt>..<tt>2</tt>&nbsp;</td>
 855         <td>one of trees is growing&nbsp;</td>
 856        </tr>
 857        <tr>
 858         <td><tt>3</tt>&nbsp;</td>
 859         <td>all trees are fully grown&nbsp;</td>
 860        </tr>
 861        <tr>
 862         <td><tt>4</tt>..<tt>6</tt>&nbsp;</td>
 863         <td>one of trees is withering&nbsp;</td>
 864        </tr>
 865       </table>
 866      </li>
 867     </ul>
 868    </td>
 869   </tr>
 870
 871   <tr bgcolor="#CCCCCC">
 872    <td valign=top nowrap><strong><a name="Class5"><tt> 5</tt></a></strong></td>
 873    <td><strong>Station tiles</strong></td>
 874   </tr>
 875   <tr>
 876    <td valign=top nowrap>&nbsp;</td>
 877    <td>
 878     <ul>
 879      <li>m1 bit 7: Ship docking tile status (for buoys)</li>
 880      <li>m1 bits 6..5: water class for buoys, water part of docks and for airport tiles</li>
 881      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the station</li>
 882      <li>m2: index into the array of stations</li>
 883      <li>m3 bits 7..4: persistent random data for railway stations/waypoints and airports)</li>
 884      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of tram tracks (road stop)</li>
 885      <li>m3 bits 3..2: ground type (road waypoints)
 886       <table>
 887        <tr>
 888         <td><tt>0</tt>&nbsp; </td>
 889         <td>on bare land</td>
 890        </tr>
 891        <tr>
 892         <td><tt>1</tt>&nbsp; </td>
 893         <td>on grass</td>
 894        </tr>
 895        <tr>
 896         <td><tt>2</tt>&nbsp; </td>
 897         <td>paved</td>
 898        </tr>
 899       </table>
 900      </li>
 901      <li>m4: custom station id; 0 means standard graphics</li>
 902      <li>m4: <a href="#RoadType">Roadtype</a> for road stops</li>
 903      <li>m5: graphics index (range from 0..255 for each station type):
 904       <table>
 905        <tr>
 906         <td nowrap valign=top><tt>00</tt>..<tt>07</tt>&nbsp; </td>
 907         <td align=left>railway station
 908          <table>
 909           <tr>
 910            <td><tt>00</tt>..<tt>01</tt>&nbsp; </td>
 911            <td align=left>open platform</td>
 912           </tr>
 913           <tr>
 914            <td><tt>02</tt>..<tt>03</tt>&nbsp; </td>
 915            <td align=left>open platform with station building</td>
 916           </tr>
 917           <tr>
 918            <td><tt>04</tt>....<tt>07</tt>&nbsp; </td>
 919            <td align=left>roofed platform</td>
 920           </tr>
 921           <tr>
 922            <td colspan=2>bit 0: clear = in X direction, set = in Y direction</td>
 923           </tr>
 924          </table>
 925         </td>
 926        </tr>
 927
 928        <tr>
 929         <td nowrap valign=top><tt>00</tt>..<tt>01</tt></td>
 930         <td align=left>waypoints
 931          <table>
 932           <tr>
 933            <td><tt>00</tt>&nbsp; </td>
 934            <td align=left>in X direction</td>
 935           </tr>
 936           <tr>
 937            <td><tt>01</tt>&nbsp; </td>
 938            <td align=left>in Y direction</td>
 939           </tr>
 940          </table>
 941         </td>
 942        </tr>
 943
 944        <tr>
 945         <td nowrap valign=top><tt>00</tt>..<tt>FF</tt></td>
 946         <td align=left>all airports</td>
 947        </tr>
 948
 949        <tr>
 950         <td nowrap valign=top><tt>00</tt>..<tt>05</tt>&nbsp; </td>
 951         <td align=left>road stops
 952          <table>
 953           <tr>
 954            <td><tt>00</tt>&nbsp; </td>
 955            <td align=left>exit towards NE</td>
 956           </tr>
 957           <tr>
 958            <td><tt>01</tt>&nbsp; </td>
 959            <td align=left>exit towards SE</td>
 960           </tr>
 961           <tr>
 962            <td><tt>02</tt>&nbsp; </td>
 963            <td align=left>exit towards SW</td>
 964           </tr>
 965           <tr>
 966            <td><tt>03</tt>&nbsp; </td>
 967            <td align=left>exit towards NW</td>
 968           </tr>
 969           <tr>
 970            <td><tt>04</tt>&nbsp; </td>
 971            <td align=left>drive through X</td>
 972           </tr>
 973           <tr>
 974            <td><tt>05</tt>&nbsp; </td>
 975            <td align=left>drive through Y</td>
 976           </tr>
 977          </table>
 978         </td>
 979        </tr>
 980
 981        <tr>
 982         <td nowrap valign=top><tt>04</tt>..<tt>05</tt>&nbsp; </td>
 983         <td align=left>road waypoints
 984          <table>
 985           <tr>
 986            <td><tt>04</tt>&nbsp; </td>
 987            <td align=left>drive through X</td>
 988           </tr>
 989           <tr>
 990            <td><tt>05</tt>&nbsp; </td>
 991            <td align=left>drive through Y</td>
 992           </tr>
 993          </table>
 994         </td>
 995        </tr>
 996
 997        <tr>
 998         <td nowrap valign=top><tt>00</tt>..<tt>05</tt>&nbsp; </td>
 999         <td align=left>ship dock
1000          <table>
1001           <tr>
1002            <td><tt>00</tt>&nbsp; </td>
1003            <td align=left>SW coast part</td>
1004           </tr>
1005           <tr>
1006            <td><tt>01</tt>&nbsp; </td>
1007            <td align=left>NW coast part</td>
1008           </tr>
1009           <tr>
1010            <td><tt>02</tt>&nbsp; </td>
1011            <td align=left>NE coast part</td>
1012           </tr>
1013           <tr>
1014            <td><tt>03</tt>&nbsp; </td>
1015            <td align=left>SE coast part</td>
1016           </tr>
1017           <tr>
1018            <td><tt>04</tt>&nbsp; </td>
1019            <td align=left>X direction water part</td>
1020           </tr>
1021           <tr>
1022            <td><tt>05</tt>&nbsp; </td>
1023            <td align=left>Y direction water part</td>
1024           </tr>
1025          </table>
1026         </td>
1027        </tr>
1028       </table>
1029      </li>
1030      <li>m6 bit 7: rail station / waypoint may have catenary pylons</li>
1031      <li>m6 bits 6..3: the station type (rail, airport, truck, bus, oilrig, dock, buoy, waypoint, road waypoint)</li>
1032      <li>m6 bit 2: pbs reservation state for railway stations/waypoints</li>
1033      <li>m6 bit 1: rail station / waypoint may have catenary wires</li>
1034      <li>m6 bit 0: rail station / waypoint is blocked</li>
1035
1036      <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road (road stops)</li>
1037      <li>m7: animation frame (railway stations/waypoints, airports)</li>
1038      <li>m8 bit 15: Snow or desert present (road waypoints)</li>
1039      <li>m8 bits 11..6: <a href="#TramType">Tramtype</a></li>
1040      <li>m8 bits 5..0: <a href="#TrackType">track type</a> for railway stations/waypoints</li>
1041      <li>m8 bits 5..0: custom road stop/waypoint id; 0 means standard graphics</li>
1042     </ul>
1043    </td>
1044   </tr>
1045
1046   <tr bgcolor="#CCCCCC">
1047    <td valign=top nowrap><strong><a name="Class6"><tt> 6 </tt></a></strong></td>
1048    <td><strong>Water</strong></td>
1049   </tr>
1050   <tr>
1051    <td valign=top nowrap>&nbsp;</td>
1052    <td>
1053     <ul>
1054      <li>m1 bit 7: Ship docking tile status</li>
1055      <li>m1 bits 6..5 : Water class (sea, canal or river)
1056      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> (for sea, rivers, and coasts normally <tt>11</tt>)</li>
1057      <li>m2: Depot index (for depots only)</li>
1058      <li>m4: Random data for canal or river tiles</li>
1059      <li>m5 bits 7..4: Water tile type:
1060       <table>
1061         <tr>
1062          <td><tt>0</tt>&nbsp; </td>
1063          <td>water, canal or river</td>
1064         </tr>
1065         <tr>
1066          <td><tt>1</tt>&nbsp; </td>
1067          <td>coast or riverbank</td>
1068         </tr>
1069         <tr>
1070          <td nowrap valign=top><tt>2</tt>&nbsp; </td>
1071          <td>canal lock<br>
1072           <ul>
1073            <li>m5 bits 3..2: Lock part
1074             <table>
1075              <tr>
1076               <td><tt>0</tt>&nbsp; </td>
1077               <td>Middle part</td>
1078              </tr>
1079              <tr>
1080               <td><tt>1</tt>&nbsp; </td>
1081               <td>Lower part</td>
1082              </tr>
1083              <tr>
1084               <td><tt>2</tt>&nbsp; </td>
1085               <td>Upper part</td>
1086              </tr>
1087             </table>
1088            </li>
1089            <li>m5 bits 1..0: Lock direction
1090             <table>
1091              <tr>
1092               <td><tt>0</tt>&nbsp; </td>
1093               <td>NE raised</td>
1094              </tr>
1095              <tr>
1096               <td><tt>1</tt>&nbsp; </td>
1097               <td>SE raised</td>
1098              </tr>
1099              <tr>
1100               <td><tt>2</tt>&nbsp; </td>
1101               <td>SW raised</td>
1102              </tr>
1103              <tr>
1104               <td><tt>3</tt>&nbsp; </td>
1105               <td>NW raised</td>
1106              </tr>
1107             </table>
1108            </li>
1109           </ul>
1110          </td>
1111         </tr>
1112         <tr>
1113          <td nowrap valign=top><tt>3</tt>&nbsp; </td>
1114          <td>depot<br>
1115           <ul>
1116            <li>m5 bit 1: Depot axis
1117             <table>
1118              <tr>
1119               <td><tt>0</tt>&nbsp; </td>
1120               <td>X direction (NE-SW)</td>
1121              </tr>
1122              <tr>
1123               <td><tt>1</tt>&nbsp; </td>
1124               <td>Y direction (NW-SE)</td>
1125              </tr>
1126             </table>
1127            </li>
1128            <li>m5 bit 0: Depot part
1129             <table>
1130              <tr>
1131               <td><tt>0</tt>&nbsp; </td>
1132               <td>North part</td>
1133              </tr>
1134              <tr>
1135               <td><tt>1</tt>&nbsp; </td>
1136               <td>South part</td>
1137              </tr>
1138             </table>
1139            </li>
1140           </ul>
1141          </td>
1142         </tr>
1143        </table>
1144       </li>
1145      </li>
1146     </ul>
1147    </td>
1148   </tr>
1149
1150   <tr bgcolor="#CCCCCC">
1151    <td valign=top nowrap><strong><a name="Class7"><tt> 7 </tt></a></strong></td>
1152    <td><strong>Void </strong></td>
1153   </tr>
1154   <tr>
1155    <td valign=top nowrap>&nbsp;</td>
1156    <td>Tiles of this class form an invisible, one tile wide border at the south (bottom) edges of the map,<br>
1157        so as to protect several algorithms from the consequences of a wraparound at the edges.
1158    </td>
1159   </tr>
1160
1161   <tr bgcolor="#CCCCCC">
1162    <td valign=top nowrap><strong><a name="Class8"><tt> 8</tt></a></strong></td>
1163    <td><strong>Industries </strong></td>
1164   </tr>
1165   <tr>
1166    <td valign=top nowrap>&nbsp;</td>
1167    <td>
1168     <ul>
1169      <li>m1 bit 7: clear = under construction
1170       <ul>
1171        <li>m1 bits 6..5 : Water class (sea, canal, river or land)
1172        <li>m1 bits 3..2: construction counter, for buildings under construction incremented on every periodic tile processing</li>
1173        <li>m1 bits 1..0: stage of construction (<tt>3</tt> = completed), incremented when the construction counter wraps around<br>
1174            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>
1175       </ul>
1176      </li>
1177      <li>m2: index into the array of industries</li>
1178      <li>m3: random bits (NewGRF)</li>
1179      <li>m4: animation loop</li>
1180      <li>m5: type (plus m6 bit 2):<br>
1181       <small>(note: this is not the same as the industry type, which is stored in the array of industries)</small>
1182
1183       <table>
1184        <tr>
1185         <td nowrap valign=top><tt>00</tt>..<tt>06</tt>&nbsp; </td>
1186         <td align=left>coal mine
1187          <table>
1188           <tr>
1189            <td nowrap valign=top><tt>00</tt>&nbsp; </td>
1190            <td align=left>wheel tower when not animated</td>
1191           </tr>
1192           <tr>
1193            <td nowrap valign=top><tt>01</tt>&nbsp; </td>
1194            <td align=left>wheel tower when animated<br>
1195             animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1196           </tr>
1197          </table>
1198         </td>
1199        </tr>
1200
1201        <tr>
1202         <td nowrap valign=top><tt>07</tt>..<tt>0A</tt>&nbsp; </td>
1203         <td align=left>power station
1204          <table>
1205           <tr>
1206            <td nowrap valign=top><tt>08</tt>&nbsp; </td>
1207            <td align=left>chimney</td>
1208           </tr>
1209           <tr>
1210            <td nowrap valign=top><tt>0A</tt>&nbsp; </td>
1211            <td align=left>transformer; animation progress in m7(valid range <tt>0</tt>..<tt>7</tt>)</td>
1212           </tr>
1213          </table>
1214         </td>
1215        </tr>
1216
1217        <tr>
1218         <td nowrap valign=top><tt>0B</tt>..<tt>0F</tt>&nbsp; </td>
1219         <td align=left>sawmill</td>
1220        </tr>
1221
1222        <tr>
1223         <td nowrap valign=top><tt>10</tt>..<tt>11</tt>&nbsp; </td>
1224         <td align=left>forest
1225          <table>
1226           <tr>
1227            <td nowrap valign=top><tt>11</tt>&nbsp; </td>
1228            <td align=left>trees cut down</td>
1229           </tr>
1230          </table>
1231         </td>
1232        </tr>
1233
1234        <tr>
1235         <td nowrap valign=top><tt>12</tt>..<tt>17</tt>&nbsp; </td>
1236         <td align=left>oil refinery</td>
1237        </tr>
1238
1239        <tr>
1240         <td nowrap valign=top><tt>18</tt>..<tt>1C</tt>&nbsp; </td>
1241         <td align=left>oil rig</td>
1242        </tr>
1243
1244        <tr>
1245         <td nowrap valign=top><tt>1D</tt>..<tt>20</tt>&nbsp; </td>
1246         <td align=left>oil wells
1247          <table>
1248           <tr>
1249            <td nowrap valign=top><tt>1D</tt>&nbsp; </td>
1250            <td align=left>not animated</td>
1251           </tr>
1252           <tr>
1253            <td nowrap valign=top><tt>1E</tt>..<tt>20</tt>&nbsp; </td>
1254            <td align=left>various stages of animation; progress of animation in m7</td>
1255           </tr>
1256          </table>
1257         </td>
1258        </tr>
1259
1260        <tr>
1261         <td nowrap valign=top><tt>21</tt>..<tt>26</tt>&nbsp; </td>
1262         <td align=left>farm</td>
1263        </tr>
1264
1265        <tr>
1266         <td nowrap valign=top><tt>27</tt>..<tt>2A</tt>&nbsp; </td>
1267         <td align=left>factory (temperate climate)</td>
1268        </tr>
1269
1270        <tr>
1271         <td nowrap valign=top><tt>2B</tt>..<tt>2E</tt>&nbsp; </td>
1272         <td align=left>printing works</td>
1273        </tr>
1274
1275        <tr>
1276         <td nowrap valign=top><tt>2F</tt>..<tt>33</tt>&nbsp; </td>
1277         <td align=left>copper ore mine
1278          <table>
1279           <tr>
1280            <td nowrap valign=top><tt>2F</tt>&nbsp; </td>
1281            <td align=left>wheel tower when not animated</td>
1282           </tr>
1283           <tr>
1284            <td nowrap valign=top><tt>30</tt>&nbsp; </td>
1285            <td align=left>wheel tower when animated; animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1286           </tr>
1287           <tr>
1288            <td nowrap valign=top><tt>31</tt>&nbsp; </td>
1289            <td align=left>chimney</td>
1290           </tr>
1291          </table>
1292         </td>
1293        </tr>
1294
1295        <tr>
1296         <td nowrap valign=top><tt>34</tt>..<tt>39</tt>&nbsp; </td>
1297         <td align=left>steel mill</td>
1298        </tr>
1299
1300        <tr>
1301         <td nowrap valign=top><tt>3A</tt>..<tt>3B</tt>&nbsp; </td>
1302         <td align=left>bank (temperate climate)</td>
1303        </tr>
1304
1305        <tr>
1306         <td nowrap valign=top><tt>3C</tt>..<tt>3F</tt>&nbsp; </td>
1307         <td align=left>food processing plant</td>
1308        </tr>
1309
1310        <tr>
1311         <td nowrap valign=top><tt>40</tt>..<tt>47</tt>&nbsp; </td>
1312         <td align=left>paper mill</td>
1313        </tr>
1314
1315        <tr>
1316         <td nowrap valign=top><tt>48</tt>..<tt>58</tt>&nbsp; </td>
1317         <td align=left>gold mine
1318          <table>
1319           <tr>
1320            <td nowrap valign=top><tt>4F</tt>&nbsp; </td>
1321            <td align=left>wheel tower when not animated</td>
1322           </tr>
1323           <tr>
1324            <td nowrap valign=top><tt>58</tt>&nbsp; </td>
1325            <td align=left>wheel tower when animated; animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1326           </tr>
1327          </table></td>
1328        </tr>
1329
1330        <tr>
1331         <td nowrap valign=top><tt>59</tt>..<tt>5A</tt>&nbsp; </td>
1332         <td align=left>bank (sub-arctic or sub-tropical climate)</td>
1333        </tr>
1334
1335        <tr>
1336         <td nowrap valign=top><tt>5B</tt>..<tt>63</tt>&nbsp; </td>
1337         <td align=left>diamond mine</td>
1338        </tr>
1339
1340        <tr>
1341         <td nowrap valign=top><tt>64</tt>..<tt>73</tt>&nbsp; </td>
1342         <td align=left>iron ore mine</td>
1343        </tr>
1344
1345        <tr>
1346         <td nowrap valign=top><tt>74</tt></td>
1347         <td align=left>fruit plantation</td>
1348        </tr>
1349
1350        <tr>
1351         <td nowrap valign=top><tt>75</tt></td>
1352         <td align=left>rubber plantation</td>
1353        </tr>
1354
1355        <tr>
1356         <td nowrap valign=top><tt>76</tt>..<tt>77</tt>&nbsp; </td>
1357         <td align=left>water supply</td>
1358        </tr>
1359
1360        <tr>
1361         <td nowrap valign=top><tt>78</tt></td>
1362         <td align=left>water tower</td>
1363        </tr>
1364
1365        <tr>
1366         <td nowrap valign=top><tt>79</tt>..<tt>7C</tt>&nbsp; </td>
1367         <td align=left>factory (sub-tropical climate)</td>
1368        </tr>
1369
1370        <tr>
1371         <td nowrap valign=top><tt>7D</tt>..<tt>80</tt>&nbsp; </td>
1372         <td align=left>lumber mill</td>
1373        </tr>
1374
1375        <tr>
1376         <td nowrap valign=top><tt>81</tt>..<tt>82</tt>&nbsp; </td>
1377         <td align=left>candyfloss forest
1378          <table>
1379           <tr>
1380            <td nowrap valign=top><tt>82</tt>&nbsp; </td>
1381            <td align=left>candyfloss 'trees' cut down</td>
1382           </tr>
1383          </table>
1384         </td>
1385        </tr>
1386
1387        <tr>
1388         <td nowrap valign=top><tt>83</tt>..<tt>86</tt>&nbsp; </td>
1389         <td align=left>sweet factory</td>
1390        </tr>
1391
1392        <tr>
1393         <td nowrap valign=top><tt>87</tt>..<tt>88</tt>&nbsp; </td>
1394         <td align=left>battery farm
1395          <table>
1396           <tr>
1397            <td nowrap valign=top><tt>88</tt>&nbsp; </td>
1398            <td align=left>batteries 'reaped'</td>
1399           </tr>
1400          </table>
1401         </td>
1402        </tr>
1403
1404        <tr>
1405         <td nowrap valign=top><tt>89</tt></td>
1406         <td align=left>cola wells</td>
1407        </tr>
1408
1409        <tr>
1410         <td nowrap valign=top><tt>8A</tt>..<tt>8D</tt>&nbsp; </td>
1411         <td align=left>toy shop</td>
1412        </tr>
1413
1414        <tr>
1415         <td nowrap valign=top><tt>8E</tt>..<tt>93</tt>&nbsp; </td>
1416         <td align=left>toy factory
1417          <table>
1418           <tr>
1419            <td nowrap valign=top><tt>8F</tt>&nbsp; </td>
1420            <td align=left>Animated part; animation state in m7 (valid range <tt>00</tt>..<tt>31</tt>)<br>
1421                         Tile animation is started (m4 zeroed) on the periodic processing.<br>
1422                         While the animation is in progress, m4 holds the number
1423                         of animation cycles that have already taken place.<br>
1424                         when this number reaches 8 the animation is stopped.</td>
1425           </tr>
1426          </table>
1427         </td>
1428        </tr>
1429
1430        <tr>
1431         <td nowrap valign=top><tt>94</tt>..<tt>9B</tt>&nbsp; </td>
1432         <td align=left>plastic fountains (various stages of cyclic animation)</td>
1433        </tr>
1434
1435        <tr>
1436         <td nowrap valign=top><tt>9C</tt>..<tt>9F</tt>&nbsp; </td>
1437         <td align=left>fizzy drink factory</td>
1438        </tr>
1439
1440        <tr>
1441         <td nowrap valign=top><tt>A0</tt>..<tt>A3</tt>&nbsp; </td>
1442         <td align=left>bubble generator
1443          <table>
1444           <tr>
1445            <td nowrap valign=top><tt>A1</tt>&nbsp; </td>
1446            <td align=left>generators</td>
1447           </tr>
1448           <tr>
1449            <td nowrap valign=top><tt>A2</tt>&nbsp; </td>
1450            <td align=left>bubble capture facility; animation state in m7 (valid range <tt>00</tt>..<tt>27</tt>)</td>
1451           </tr>
1452          </table>
1453         </td>
1454        </tr>
1455
1456        <tr>
1457         <td nowrap valign=top><tt>A4</tt>..<tt>A6</tt>&nbsp; </td>
1458         <td align=left>toffee quarry
1459          <table>
1460           <tr>
1461            <td nowrap valign=top><tt>A5</tt>&nbsp; </td>
1462            <td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>45</tt>)</td>
1463           </tr>
1464          </table>
1465         </td>
1466        </tr>
1467
1468        <tr>
1469         <td nowrap valign=top><tt>A7</tt>..<tt>AE</tt>&nbsp; </td>
1470         <td align=left>sugar mine
1471          <table>
1472           <tr>
1473            <td nowrap valign=top><tt>AE</tt>&nbsp; </td>
1474            <td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>5F</tt>)</td>
1475           </tr>
1476          </table>
1477         </td>
1478        </tr>
1479        <tr>
1480         <td nowrap valign=top><tt>AF</tt>..<tt>1FF</tt>&nbsp; </td>
1481         <td align=left>NewGRF industries industry</td>
1482        </tr>
1483       </table>
1484      </li>
1485      <li>m6 bits 5..3: random triggers (NewGRF)</li>
1486      <li>m6 bit 2: bit 8 of type (see m5)</li>
1487      <li>m7: animation frame</li>
1488     </ul>
1489    </td>
1490   </tr>
1491
1492   <tr bgcolor="#CCCCCC">
1493    <td valign=top nowrap><strong><a name="Class9"><tt> 9</tt></a></strong></td>
1494    <td><strong>Tunnel / bridge</strong></td>
1495   </tr>
1496   <tr>
1497    <td valign=top nowrap>&nbsp;</td>
1498    <td>
1499     <ul>
1500      <li>m1 bit 7: Ship docking tile status (for aqueducts)</li>
1501      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a></li>
1502      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of tram</li>
1503      <li>m4: <a href="#RoadType">Roadtype</a></li>
1504      <li>m5 bit 4: pbs reservation state for railway</li>
1505      <li>m5 bits 7 clear: tunnel entrance/exit</li>
1506      <li>m5 bit 7 set: bridge ramp
1507       <ul>
1508        <li>m6 bits 5..2: <a name="BridgeType">bridge type</a>:
1509         <table>
1510          <tr>
1511           <th align=left>Type&nbsp;</th>
1512           <th align=left>Max. speed (mph)&nbsp;</th>
1513           <th align=left>Description</th>
1514          </tr>
1515
1516          <tr>
1517           <td nowrap valign=top><tt>0</tt>&nbsp; </td>
1518           <td align=center>20</td>
1519           <td align=left>wooden</td>
1520          </tr>
1521
1522          <tr>
1523           <td nowrap valign=top><tt>1</tt>&nbsp; </td>
1524           <td align=center>30</td>
1525           <td align=left>concrete</td>
1526          </tr>
1527
1528          <tr>
1529           <td nowrap valign=top><tt>2</tt>&nbsp; </td>
1530           <td align=center>40</td>
1531           <td align=left>girder, steel</td>
1532          </tr>
1533
1534          <tr>
1535           <td nowrap valign=top><tt>3</tt>&nbsp; </td>
1536           <td align=center>50</td>
1537           <td align=left>suspension, concrete</td>
1538          </tr>
1539
1540          <tr>
1541           <td nowrap valign=top><tt>4</tt>&nbsp; </td>
1542           <td align=center>60</td>
1543           <td align=left>suspension, steel</td>
1544          </tr>
1545
1546          <tr>
1547           <td nowrap valign=top><tt>5</tt>&nbsp; </td>
1548           <td align=center>70</td>
1549           <td align=left>suspension, steel</td>
1550          </tr>
1551
1552          <tr>
1553           <td nowrap valign=top><tt>6</tt>&nbsp; </td>
1554           <td align=center>100</td>
1555           <td align=left>cantilever, steel</td>
1556          </tr>
1557
1558          <tr>
1559           <td nowrap valign=top><tt>7</tt>&nbsp; </td>
1560           <td align=center>130</td>
1561           <td align=left>cantilever, steel</td>
1562          </tr>
1563
1564          <tr>
1565           <td nowrap valign=top><tt>8</tt>&nbsp; </td>
1566           <td align=center>150</td>
1567           <td align=left>cantilever, steel</td>
1568          </tr>
1569
1570          <tr>
1571           <td nowrap valign=top><tt>9</tt>&nbsp; </td>
1572           <td align=center>160</td>
1573           <td align=left>girder, steel</td>
1574          </tr>
1575
1576          <tr>
1577           <td nowrap valign=top><tt>A</tt>&nbsp; </td>
1578           <td align=center>200</td>
1579           <td align=left>tubular, steel</td>
1580          </tr>
1581
1582          <tr>
1583           <td nowrap valign=top><tt>B</tt>&nbsp; </td>
1584           <td align=center>320</td>
1585           <td align=left>tubular, steel</td>
1586          </tr>
1587
1588          <tr>
1589           <td nowrap valign=top><tt>C</tt>&nbsp; </td>
1590           <td align=center>380</td>
1591           <td align=left>tubular, silicon</td>
1592          </tr>
1593         </table>
1594        </li>
1595       </ul>
1596      </li>
1597      <li>m5 bits 3..2: transport type
1598       <table>
1599        <tr>
1600         <td><tt>0</tt>&nbsp;</td>
1601         <td>railway</td>
1602        </tr>
1603
1604        <tr>
1605         <td><tt>1</tt>&nbsp;</td>
1606         <td>road</td>
1607        </tr>
1608
1609        <tr>
1610         <td><tt>2</tt>&nbsp;</td>
1611         <td>water</td>
1612        </tr>
1613       </table>
1614      </li>
1615      <li>m5 bits 1..0: direction onto the bridge / out of the tunnel
1616       <table>
1617        <tr>
1618         <td><tt>0</tt>&nbsp; </td>
1619         <td>NE</td>
1620        </tr>
1621
1622        <tr>
1623         <td><tt>1</tt>&nbsp; </td>
1624         <td>SE</td>
1625        </tr>
1626
1627        <tr>
1628         <td><tt>2</tt>&nbsp; </td>
1629         <td>SW</td>
1630        </tr>
1631
1632        <tr>
1633         <td><tt>3</tt>&nbsp; </td>
1634         <td>NW</td>
1635        </tr>
1636       </table>
1637      </li>
1638      <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road</li>
1639      <li>m7 bit 5 set = on snow or desert</li>
1640      <li>m8 bits 11..6: <a href="#TramType">Tramtype</a></li>
1641      <li>m8 bits 5..0: <a href="#TrackType">track type</a> for railway</li>
1642     </ul>
1643    </td>
1644   </tr>
1645
1646   <tr bgcolor="#CCCCCC">
1647    <td valign=top nowrap><strong><a name="ClassA"><tt> A</tt></a></strong></td>
1648    <td><strong><tt>Objects</tt></strong></td>
1649   </tr>
1650   <tr>
1651    <td valign=top nowrap>&nbsp;</td>
1652    <td>
1653     <ul>
1654      <li>m1 bits 6..5 : Water class (sea, canal, river or land)</li>
1655      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the object (for lighthouses and transmitters normally <tt>10</tt>)</li>
1656      <li>m2: index into the array of objects, bits 0 to 15 (upper bits in m5)</li>
1657      <li>m3: random bits</li>
1658      <li>m5: index into the array of objects, bits 16 to 23 (lower bits in m2)</li>
1659      <li>m7: animation counter</li>
1660     </ul>
1661    </td>
1662   </tr>
1663   <tr>
1664    <td colspan=2>Classes <tt>B</tt> through <tt>F</tt> are reserved. The presence
1665       of a tile in one of the reserved classes will crash OTTD.</td>
1666   </tr>
1667  </table>
1668
1669
1670  <hr>
1671  Original Copyright &copy; 2003 by Marcin Grzegorczyk for TTDLX.<br>
1672  Transport Tycoon and Transport Tycoon Deluxe are Copyright &copy; by Chris Sawyer.<br>
1673  All the other trademarks are the property of their respective owners.<br>
1674 </body>
1675
1676 </html>