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