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