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          <li style="color: blue">m2 bit 12: this signal tile has 1 or more restricted signals (tracerestrict patch)</li>
 457
 458          <li>m3 bits 7..4: bit set = signal 3..0 present</li>
 459          <li>m4 bits 7..4: bit clear = signal 3..0 shows red</li>
 460         </ul>
 461        </li>
 462        <li>m2 bits 8..10: track reserved for pbs
 463          <table>
 464           <tr>
 465             <td><tt>0</tt>&nbsp; </td>
 466             <td>not reserved</td>
 467           </tr>
 468           <tr>
 469             <td><tt>1</tt>&nbsp; </td>
 470             <td>X direction</td>
 471           </tr>
 472           <tr>
 473             <td><tt>2</tt>&nbsp; </td>
 474             <td>Y direction</td>
 475           </tr>
 476           <tr>
 477             <td><tt>3</tt>&nbsp; </td>
 478             <td>north corner (W-E)</td>
 479           </tr>
 480           <tr>
 481             <td><tt>4</tt>&nbsp; </td>
 482             <td>south corner (W-E)</td>
 483           </tr>
 484           <tr>
 485             <td><tt>5</tt>&nbsp; </td>
 486             <td>west corner (N-S)</td>
 487           </tr>
 488           <tr>
 489             <td><tt>6</tt>&nbsp; </td>
 490             <td>east corner (N-S)</td>
 491           </tr>
 492          </table>
 493        </li>
 494        <li>m2 bit 11: opposite track is reserved, too</li>
 495       </ul>
 496      </li>
 497      <li>m5 bit 7 set, bit 6 set: railway depot
 498       <ul>
 499        <li>m2: Depot index</li>
 500        <li>m5 bits 1..0: exit towards
 501         <table>
 502          <tr>
 503           <td><tt>0</tt>&nbsp; </td>
 504           <td>NE</td>
 505          </tr>
 506
 507          <tr>
 508           <td><tt>1</tt>&nbsp; </td>
 509           <td>SE</td>
 510          </tr>
 511
 512          <tr>
 513           <td><tt>2</tt>&nbsp; </td>
 514           <td>SW</td>
 515          </tr>
 516
 517          <tr>
 518           <td><tt>3</tt>&nbsp; </td>
 519           <td>NW</td>
 520          </tr>
 521         </table>
 522        </li>
 523        <li>m5 bit 4: pbs reservation state</li>
 524       </ul>
 525      </li>
 526     </ul>
 527    </td>
 528   </tr>
 529
 530   <tr bgcolor="#CCCCCC">
 531    <td valign=top nowrap><strong><a name="Class2"><tt> 2</tt></a></strong></td>
 532    <td><strong>Roads</strong></td>
 533   </tr>
 534   <tr>
 535    <td valign=top nowrap>&nbsp;</td>
 536    <td>
 537     <ul>
 538      <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>
 539      <li>m7 bit 5 set = on snow or desert</li>
 540      <li>m7 bits 7..6: present road types
 541       <table>
 542        <tr>
 543         <td>bit 0&nbsp; </td>
 544         <td>normal road</td>
 545        </tr>
 546
 547        <tr>
 548         <td>bit 1&nbsp; </td>
 549         <td>tram</td>
 550        </tr>
 551       </table>
 552      </li>
 553      <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>)
 554      <li>m5 bits 7 clear: road or level-crossing
 555       <ul>
 556        <li>m6 bits 5..3:
 557         <table>
 558          <tr>
 559           <td><tt>0</tt>&nbsp; </td>
 560           <td>on bare land</td>
 561          </tr>
 562          <tr>
 563           <td><tt>1</tt>&nbsp; </td>
 564           <td>on grass</td>
 565          </tr>
 566          <tr>
 567           <td><tt>2</tt>&nbsp; </td>
 568           <td>paved</td>
 569          </tr>
 570          <tr>
 571           <td><tt>3</tt>&nbsp; </td>
 572           <td>with streetlights</td>
 573          </tr>
 574          <tr>
 575           <td><tt>5</tt>&nbsp; </td>
 576           <td>tree-lined</td>
 577          </tr>
 578          <tr>
 579           <td><tt>6</tt>&nbsp; </td>
 580           <td>on grass with road works</td>
 581          </tr>
 582          <tr>
 583           <td><tt>7</tt>&nbsp; </td>
 584           <td>paved with road works</td>
 585          </tr>
 586         </table>
 587        </li>
 588        <li>m5 bit 6 clear: road
 589         <ul>
 590          <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 591          <li>m7 bits 3..0: counter for the roadworks</li>
 592          <li>m5 bits 3..0: road layout road type 0 (normal road): bit set = road piece present:
 593           <table>
 594            <tr>
 595             <td align=left>bit 0: </td>
 596             <td>NW piece</td>
 597            </tr>
 598            <tr>
 599             <td align=left>bit 1: </td>
 600             <td>SW piece</td>
 601            </tr>
 602            <tr>
 603             <td align=left>bit 2: </td>
 604             <td>SE piece</td>
 605            </tr>
 606            <tr>
 607             <td align=left>bit 3: </td>
 608             <td>NE piece</td>
 609            </tr>
 610           </table>
 611          </li>
 612          <li>m3 bits 0..3: road layout road type 1 (tram)</li>
 613          <li>m5 bits 5..4: bits to disallow vehicles to go a specific direction
 614           <table>
 615            <tr>
 616             <td align=left>bit 0: </td>
 617             <td>set = disallow driving in south-west or south-east direction</td>
 618            </tr>
 619            <tr>
 620             <td align=left>bit 1: </td>
 621             <td>set = disallow driving in north-west or north-east direction</td>
 622            </tr>
 623           </table>
 624          </li>
 625         </ul>
 626        </li>
 627        <li>m5 bit 6 set: level crossing
 628         <ul>
 629          <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the railway track</li>
 630          <li>m3 bits 3..0: <a href="#TrackType">railway track type</a></li>
 631          <li>m5 bit 0: direction
 632           <table>
 633            <tr>
 634             <td align=left><tt>0</tt>&nbsp; </td>
 635             <td align=left>road in the X direction, rail in Y</td>
 636            </tr>
 637            <tr>
 638             <td align=left><tt>1</tt>&nbsp; </td>
 639             <td align=left>road in the Y direction, rail in X</td>
 640            </tr>
 641           </table>
 642          </li>
 643          <li>m5 bit 5: set if crossing lights are on</li>
 644          <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 645          <li>m5 bit 4: pbs reservation state</li>
 646         </ul>
 647        </li>
 648       </ul>
 649      </li>
 650      <li>m5 bit 7 set, bit 6 clear: road depot
 651       <ul>
 652        <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the depot</li>
 653        <li>m2: Depot index</li>
 654        <li>m5 bits 1..0: exit towards:
 655         <table>
 656          <tr>
 657           <td><tt>0</tt>&nbsp; </td>
 658           <td>NE</td>
 659          </tr>
 660
 661          <tr>
 662           <td><tt>1</tt>&nbsp; </td>
 663           <td>SE</td>
 664          </tr>
 665
 666          <tr>
 667           <td><tt>2</tt>&nbsp; </td>
 668           <td>SW</td>
 669          </tr>
 670
 671          <tr>
 672           <td><tt>3</tt>&nbsp; </td>
 673           <td>NW</td>
 674          </tr>
 675         </table>
 676        </li>
 677        <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of the road type 0 (normal road)</li>
 678       </ul>
 679      </li>
 680     </ul>
 681    </td>
 682   </tr>
 683
 684   <tr bgcolor="#CCCCCC">
 685    <td valign=top nowrap><strong><a name="Class3"><tt> 3</tt></a></strong></td>
 686    <td><strong>Town building </strong></td>
 687   </tr>
 688   <tr>
 689    <td valign=top nowrap>&nbsp;</td>
 690    <td>
 691     <ul>
 692      <li>m1 : Random bits <a href="#newhouses">(newhouses)</a> </li>
 693      <li>m2 : index into the array of towns</li>
 694      <li>m3 bit 7 :
 695       <ul>
 696        <li> set : House is complete
 697         <ul>
 698          <li>m5 : Age of house in years, clamped at 255</li>
 699         </ul>
 700        </li>
 701        <li> clear : House is in construction
 702         <ul>
 703          <li>m5 bits 7..5 : free</li>
 704          <li>m5 bits 4..3 : construction stage</li>
 705          <li>m5 bits 2..0 : construction counter</li>
 706         </ul>
 707        </li>
 708       </ul>
 709      <li>m3 bit 6 : bit 8 of house type (m4), allowing 512 different types.</li>
 710      <li>m3 bit 5 : free</li>
 711      <li>m3 bits 4..0 : triggers activated <a href="#newhouses">(newhouses)</a></li>
 712      <li>m4 : <a href="landscape_externals.html">town building type</a> (with m3[6] bit)</li>
 713      <li>m5 : see m3 bit 7</li>
 714      <li>m6 :
 715       <ul>
 716        <li>If <a href="#newhouses">newhouses</a> is activated
 717         <ul>
 718          <li>bits 7..2 : Periodic processing time remaining</li>
 719         </ul>
 720        </li>
 721        <li>Standard behaviour
 722         <ul>
 723          <li>bits 7..2 : lift position (for houses type 04 and 05)</li>
 724         </ul>
 725        </li>
 726       </ul>
 727      </li>
 728      <li>m7 :
 729       <ul>
 730        <li>If <a href="#newhouses">newhouses</a> is activated
 731         <ul>
 732          <li>Current animation frame</li>
 733         </ul>
 734        </li>
 735        <li>Standard behaviour (only for houses type 04 and 05)
 736         <ul>
 737          <li>bits 7..4 : free</li>
 738          <li>bits 3..1 : lift destination.  Values can be 0..6, except 1.<br>
 739              So the building has 6 effective floors. This is due to the fact that the first floor is 2 'normal' floors high.<br>
 740              One 'normal' floor has a height of 6 lift positions.
 741          </li>
 742          <li>bit 0 : Lift has destination when set</li>
 743         </ul>
 744        </li>
 745       </ul>
 746      </li>
 747     </ul>
 748     <small><a name="newhouses"></a>Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).<br>
 749     It allows the replacement of the properties as well as the graphics of houses in the game.<br>
 750     To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.<br>
 751     110 is the count of standard houses. So above 110 means there is a new definition of at least one house</small>
 752    </td>
 753   </tr>
 754
 755   <tr bgcolor="#CCCCCC">
 756    <td valign=top nowrap><strong><a name="Class4"><tt> 4 </tt></a></strong></td>
 757    <td><strong>Trees </strong></td>
 758   </tr>
 759   <tr>
 760    <td valign=top nowrap>&nbsp;</td>
 761    <td>
 762     <ul>
 763      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> (normally <tt>10</tt>)</li>
 764      <li>m2 bits 8..6: ground
 765       <table>
 766
 767        <tr>
 768         <td align=left><tt>0</tt>&nbsp; </td>
 769         <td>on grass</td>
 770        </tr>
 771
 772        <tr>
 773         <td align=left><tt>1</tt>&nbsp; </td>
 774         <td>on rough land (density must be 3)</td>
 775        </tr>
 776
 777        <tr>
 778         <td align=left><tt>2</tt>&nbsp; </td>
 779         <td>on snow or desert</td>
 780        </tr>
 781
 782        <tr>
 783         <td align=left><tt>3</tt>&nbsp; </td>
 784         <td>on shore (density must be 3)</td>
 785        </tr>
 786
 787        <tr>
 788         <td align=left><tt>4</tt>&nbsp; </td>
 789         <td>on snow with rough land underneed</td>
 790        </tr>
 791       </table>
 792      </li>
 793      <li>m2 bits 5..4: ground density</li>
 794      <li>m2 bits 3..0: update counter, incremented on every periodic processing.<br>
 795           on wraparound the growth status is updated (or, if it's <tt>3</tt>, a random action is taken)</li>
 796      <li>m3 bits 7..0: type of trees:
 797       <table>
 798        <tr>
 799         <td nowrap valign=top><tt>00</tt>..<tt>0B</tt>&nbsp; </td>
 800         <td align=left>temperate climate trees</td>
 801        </tr>
 802
 803        <tr>
 804         <td nowrap valign=top><tt>0C</tt>..<tt>13</tt>&nbsp; </td>
 805         <td align=left>sub-arctic climate trees</td>
 806        </tr>
 807
 808        <tr>
 809         <td nowrap valign=top><tt>14</tt>..<tt>1A</tt>&nbsp; </td>
 810         <td align=left>rainforest trees</td>
 811        </tr>
 812
 813        <tr>
 814         <td nowrap valign=top><tt>1B</tt> </td>
 815         <td align=left>cactus plants</td>
 816        </tr>
 817
 818        <tr>
 819         <td nowrap valign=top><tt>1C</tt>..<tt>1F</tt>&nbsp; </td>
 820         <td align=left>sub-tropical climate, non-rainforest, non-desert trees</td>
 821        </tr>
 822
 823        <tr>
 824         <td nowrap valign=top><tt>20</tt>..<tt>28</tt>&nbsp; </td>
 825         <td align=left>toyland trees</td>
 826        </tr>
 827       </table>
 828       <small>Note: the actually displayed set of trees depends on both type and number of trees</small>
 829      </li>
 830      <li>m5 bits 7..6: number of trees minus one</li>
 831      <li>m5 bits 2..0: growth status:
 832       <table border="0">
 833        <tr>
 834         <td><tt>0</tt>..<tt>2</tt>&nbsp;</td>
 835         <td>one of trees is growing&nbsp;</td>
 836        </tr>
 837        <tr>
 838         <td><tt>3</tt>&nbsp;</td>
 839         <td>all trees are fully grown&nbsp;</td>
 840        </tr>
 841        <tr>
 842         <td><tt>4</tt>..<tt>6</tt>&nbsp;</td>
 843         <td>one of trees is withering&nbsp;</td>
 844        </tr>
 845       </table>
 846      </li>
 847     </ul>
 848    </td>
 849   </tr>
 850
 851   <tr bgcolor="#CCCCCC">
 852    <td valign=top nowrap><strong><a name="Class5"><tt> 5</tt></a></strong></td>
 853    <td><strong>Station tiles</strong></td>
 854   </tr>
 855   <tr>
 856    <td valign=top nowrap>&nbsp;</td>
 857    <td>
 858     <ul>
 859      <li>m1 bits 6..5: water class for buoys, water part of docks and for airport tiles</li>
 860      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the station</li>
 861      <li>m2: index into the array of stations</li>
 862      <li>m3 bits 7..4: persistent random data for railway stations/waypoints and airports)</li>
 863      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of tram tracks (road stop)</li>
 864      <li>m3 bits 3..0: <a href="#TrackType">track type</a> for railway stations/waypoints</li>
 865      <li>m4: custom station id; 0 means standard graphics</li>
 866      <li>m5: graphics index (range from 0..255 for each station type):
 867       <table>
 868        <tr>
 869         <td nowrap valign=top><tt>00</tt>..<tt>07</tt>&nbsp; </td>
 870         <td align=left>railway station
 871          <table>
 872           <tr>
 873            <td><tt>00</tt>..<tt>01</tt>&nbsp; </td>
 874            <td align=left>open platform</td>
 875           </tr>
 876           <tr>
 877            <td><tt>02</tt>..<tt>03</tt>&nbsp; </td>
 878            <td align=left>open platform with station building</td>
 879           </tr>
 880           <tr>
 881            <td><tt>04</tt>....<tt>07</tt>&nbsp; </td>
 882            <td align=left>roofed platform</td>
 883           </tr>
 884           <tr>
 885            <td colspan=2>bit 0: clear = in X direction, set = in Y direction</td>
 886           </tr>
 887          </table>
 888         </td>
 889        </tr>
 890
 891        <tr>
 892         <td nowrap valign=top><tt>00</tt>..<tt>01</tt></td>
 893         <td align=left>waypoints
 894          <table>
 895           <tr>
 896            <td><tt>00</tt>&nbsp; </td>
 897            <td align=left>in X direction</td>
 898           </tr>
 899           <tr>
 900            <td><tt>01</tt>&nbsp; </td>
 901            <td align=left>in Y direction</td>
 902           </tr>
 903          </table>
 904         </td>
 905        </tr>
 906
 907        <tr>
 908         <td nowrap valign=top><tt>00</tt>..<tt>FF</tt></td>
 909         <td align=left>all airports</td>
 910        </tr>
 911
 912        <tr>
 913         <td nowrap valign=top><tt>00</tt>..<tt>05</tt>&nbsp; </td>
 914         <td align=left>road stops
 915          <table>
 916           <tr>
 917            <td><tt>00</tt>&nbsp; </td>
 918            <td align=left>exit towards NE</td>
 919           </tr>
 920           <tr>
 921            <td><tt>01</tt>&nbsp; </td>
 922            <td align=left>exit towards SE</td>
 923           </tr>
 924           <tr>
 925            <td><tt>02</tt>&nbsp; </td>
 926            <td align=left>exit towards SW</td>
 927           </tr>
 928           <tr>
 929            <td><tt>03</tt>&nbsp; </td>
 930            <td align=left>exit towards NW</td>
 931           </tr>
 932           <tr>
 933            <td><tt>04</tt>&nbsp; </td>
 934            <td align=left>drive through X</td>
 935           </tr>
 936           <tr>
 937            <td><tt>05</tt>&nbsp; </td>
 938            <td align=left>drive through Y</td>
 939           </tr>
 940          </table>
 941         </td>
 942        </tr>
 943
 944        <tr>
 945         <td nowrap valign=top><tt>00</tt>..<tt>05</tt>&nbsp; </td>
 946         <td align=left>ship dock
 947          <table>
 948           <tr>
 949            <td><tt>00</tt>&nbsp; </td>
 950            <td align=left>SW coast part</td>
 951           </tr>
 952           <tr>
 953            <td><tt>01</tt>&nbsp; </td>
 954            <td align=left>NW coast part</td>
 955           </tr>
 956           <tr>
 957            <td><tt>02</tt>&nbsp; </td>
 958            <td align=left>NE coast part</td>
 959           </tr>
 960           <tr>
 961            <td><tt>03</tt>&nbsp; </td>
 962            <td align=left>SE coast part</td>
 963           </tr>
 964           <tr>
 965            <td><tt>04</tt>&nbsp; </td>
 966            <td align=left>X direction water part</td>
 967           </tr>
 968           <tr>
 969            <td><tt>05</tt>&nbsp; </td>
 970            <td align=left>Y direction water part</td>
 971           </tr>
 972          </table>
 973         </td>
 974        </tr>
 975       </table>
 976      </li>
 977      <li>m6 bits 5..3: the station type (rail, airport, truck, bus, oilrig, dock, buoy, waypoint)</li>
 978      <li>m6 bit 2: pbs reservation state for railway stations/waypoints</li>
 979
 980      <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road (road stops)</li>
 981      <li>m7 bits 7..6: present road types (road stops)</li>
 982      <li>m7: animation frame (railway stations/waypoints, airports)</li>
 983     </ul>
 984    </td>
 985   </tr>
 986
 987   <tr bgcolor="#CCCCCC">
 988    <td valign=top nowrap><strong><a name="Class6"><tt> 6 </tt></a></strong></td>
 989    <td><strong>Water</strong></td>
 990   </tr>
 991   <tr>
 992    <td valign=top nowrap>&nbsp;</td>
 993    <td>
 994     <ul>
 995      <li>m1 bits 6..5 : Water class (sea, canal or river)
 996      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> (for sea, rivers, and coasts normally <tt>11</tt>)</li>
 997      <li>m2: Depot index (for depots only)</li>
 998      <li>m4: Random data for canal or river tiles</li>
 999      <li>m5: tile type:
1000       <table>
1001        <tr>
1002         <td nowrap valign=top><tt>00</tt>&nbsp; </td>
1003         <td align=left>water, canal or river</td>
1004        </tr>
1005
1006        <tr>
1007         <td nowrap valign=top><tt>01</tt>&nbsp; </td>
1008         <td align=left>coast or riverbank</td>
1009        </tr>
1010
1011        <tr>
1012         <td nowrap valign=top><tt>10</tt>..<tt>1B</tt>&nbsp; </td>
1013         <td align=left>canal locks
1014          <table>
1015           <tr>
1016            <td nowrap valign=top><tt>10</tt>&nbsp; </td>
1017            <td align=left>middle part, (SW-NE direction)</td>
1018           </tr>
1019           <tr>
1020            <td nowrap valign=top><tt>11</tt>&nbsp; </td>
1021            <td align=left>middle part, (NW-SE direction)</td>
1022           </tr>
1023           <tr>
1024            <td nowrap valign=top><tt>12</tt>&nbsp; </td>
1025            <td align=left>middle part, (NE-SW direction)</td>
1026           </tr>
1027           <tr>
1028            <td nowrap valign=top><tt>13</tt>&nbsp; </td>
1029            <td align=left>middle part, (SE-NW direction)</td>
1030           </tr>
1031           <tr>
1032            <td nowrap valign=top><tt>14</tt>&nbsp; </td>
1033            <td align=left>lower part, (SW-NE direction)</td>
1034           </tr>
1035           <tr>
1036            <td nowrap valign=top><tt>15</tt>&nbsp; </td>
1037            <td align=left>lower part, (NW-SE direction)</td>
1038           </tr>
1039           <tr>
1040            <td nowrap valign=top><tt>16</tt>&nbsp; </td>
1041            <td align=left>lower part, (NE-SW direction)</td>
1042           </tr>
1043           <tr>
1044            <td nowrap valign=top><tt>17</tt>&nbsp; </td>
1045            <td align=left>lower part, (SE-NW direction)</td>
1046           </tr>
1047           <tr>
1048            <td nowrap valign=top><tt>18</tt>&nbsp; </td>
1049            <td align=left>upper part, (SW-NE direction)</td>
1050           </tr>
1051           <tr>
1052            <td nowrap valign=top><tt>19</tt>&nbsp; </td>
1053            <td align=left>upper part, (NW-SE direction)</td>
1054           </tr>
1055           <tr>
1056            <td nowrap valign=top><tt>1A</tt>&nbsp; </td>
1057            <td align=left>upper part, (NE-SW direction)</td>
1058           </tr>
1059           <tr>
1060            <td nowrap valign=top><tt>1B</tt>&nbsp; </td>
1061            <td align=left>upper part, (SE-NW direction)</td>
1062           </tr>
1063          </table>
1064         </td>
1065        </tr>
1066
1067        <tr>
1068         <td nowrap valign=top><tt>80</tt>..<tt>83</tt>&nbsp; </td>
1069         <td align=left>ship depots
1070          <table>
1071           <tr>
1072            <td nowrap valign=top><tt>80</tt>&nbsp; </td>
1073            <td align=left>ship depot, NE part (X direction)</td>
1074           </tr>
1075           <tr>
1076            <td nowrap valign=top><tt>81</tt>&nbsp; </td>
1077            <td align=left>ship depot, SW part (X direction)</td>
1078           </tr>
1079           <tr>
1080            <td nowrap valign=top><tt>82</tt>&nbsp; </td>
1081            <td align=left>ship depot, NW part (Y direction)</td>
1082           </tr>
1083           <tr>
1084            <td nowrap valign=top><tt>83</tt>&nbsp; </td>
1085            <td align=left>ship depot, SE part (Y direction)</td>
1086           </tr>
1087          </table>
1088         </td>
1089        </tr>
1090       </table>
1091      </li>
1092     </ul>
1093    </td>
1094   </tr>
1095
1096   <tr bgcolor="#CCCCCC">
1097    <td valign=top nowrap><strong><a name="Class7"><tt> 7 </tt></a></strong></td>
1098    <td><strong>Void </strong></td>
1099   </tr>
1100   <tr>
1101    <td valign=top nowrap>&nbsp;</td>
1102    <td>Tiles of this class form an invisible, one tile wide border at the south (bottom) edges of the map,<br>
1103        so as to protect several algorithms from the consequences of a wraparound at the edges.
1104    </td>
1105   </tr>
1106
1107   <tr bgcolor="#CCCCCC">
1108    <td valign=top nowrap><strong><a name="Class8"><tt> 8</tt></a></strong></td>
1109    <td><strong>Industries </strong></td>
1110   </tr>
1111   <tr>
1112    <td valign=top nowrap>&nbsp;</td>
1113    <td>
1114     <ul>
1115      <li>m1 bit 7: clear = under construction
1116       <ul>
1117        <li>m1 bits 6..5 : Water class (sea, canal, river or land)
1118        <li>m1 bits 3..2: construction counter, for buildings under construction incremented on every periodic tile processing</li>
1119        <li>m1 bits 1..0: stage of construction (<tt>3</tt> = completed), incremented when the construction counter wraps around<br>
1120            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>
1121       </ul>
1122      </li>
1123      <li>m2: index into the array of industries</li>
1124      <li>m3: random bits (NewGRF)</li>
1125      <li>m4: animation loop</li>
1126      <li>m5: type (plus m6 bit 2):<br>
1127       <small>(note: this is not the same as the industry type, which is stored in the array of industries)</small>
1128
1129       <table>
1130        <tr>
1131         <td nowrap valign=top><tt>00</tt>..<tt>06</tt>&nbsp; </td>
1132         <td align=left>coal mine
1133          <table>
1134           <tr>
1135            <td nowrap valign=top><tt>00</tt>&nbsp; </td>
1136            <td align=left>wheel tower when not animated</td>
1137           </tr>
1138           <tr>
1139            <td nowrap valign=top><tt>01</tt>&nbsp; </td>
1140            <td align=left>wheel tower when animated<br>
1141             animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1142           </tr>
1143          </table>
1144         </td>
1145        </tr>
1146
1147        <tr>
1148         <td nowrap valign=top><tt>07</tt>..<tt>0A</tt>&nbsp; </td>
1149         <td align=left>power station
1150          <table>
1151           <tr>
1152            <td nowrap valign=top><tt>08</tt>&nbsp; </td>
1153            <td align=left>chimney</td>
1154           </tr>
1155           <tr>
1156            <td nowrap valign=top><tt>0A</tt>&nbsp; </td>
1157            <td align=left>transformer; animation progress in m7(valid range <tt>0</tt>..<tt>7</tt>)</td>
1158           </tr>
1159          </table>
1160         </td>
1161        </tr>
1162
1163        <tr>
1164         <td nowrap valign=top><tt>0B</tt>..<tt>0F</tt>&nbsp; </td>
1165         <td align=left>sawmill</td>
1166        </tr>
1167
1168        <tr>
1169         <td nowrap valign=top><tt>10</tt>..<tt>11</tt>&nbsp; </td>
1170         <td align=left>forest
1171          <table>
1172           <tr>
1173            <td nowrap valign=top><tt>11</tt>&nbsp; </td>
1174            <td align=left>trees cut down</td>
1175           </tr>
1176          </table>
1177         </td>
1178        </tr>
1179
1180        <tr>
1181         <td nowrap valign=top><tt>12</tt>..<tt>17</tt>&nbsp; </td>
1182         <td align=left>oil refinery</td>
1183        </tr>
1184
1185        <tr>
1186         <td nowrap valign=top><tt>18</tt>..<tt>1C</tt>&nbsp; </td>
1187         <td align=left>oil rig</td>
1188        </tr>
1189
1190        <tr>
1191         <td nowrap valign=top><tt>1D</tt>..<tt>20</tt>&nbsp; </td>
1192         <td align=left>oil wells
1193          <table>
1194           <tr>
1195            <td nowrap valign=top><tt>1D</tt>&nbsp; </td>
1196            <td align=left>not animated</td>
1197           </tr>
1198           <tr>
1199            <td nowrap valign=top><tt>1E</tt>..<tt>20</tt>&nbsp; </td>
1200            <td align=left>various stages of animation; progress of animation in m7</td>
1201           </tr>
1202          </table>
1203         </td>
1204        </tr>
1205
1206        <tr>
1207         <td nowrap valign=top><tt>21</tt>..<tt>26</tt>&nbsp; </td>
1208         <td align=left>farm</td>
1209        </tr>
1210
1211        <tr>
1212         <td nowrap valign=top><tt>27</tt>..<tt>2A</tt>&nbsp; </td>
1213         <td align=left>factory (temperate climate)</td>
1214        </tr>
1215
1216        <tr>
1217         <td nowrap valign=top><tt>2B</tt>..<tt>2E</tt>&nbsp; </td>
1218         <td align=left>printing works</td>
1219        </tr>
1220
1221        <tr>
1222         <td nowrap valign=top><tt>2F</tt>..<tt>33</tt>&nbsp; </td>
1223         <td align=left>copper ore mine
1224          <table>
1225           <tr>
1226            <td nowrap valign=top><tt>2F</tt>&nbsp; </td>
1227            <td align=left>wheel tower when not animated</td>
1228           </tr>
1229           <tr>
1230            <td nowrap valign=top><tt>30</tt>&nbsp; </td>
1231            <td align=left>wheel tower when animated; animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1232           </tr>
1233           <tr>
1234            <td nowrap valign=top><tt>31</tt>&nbsp; </td>
1235            <td align=left>chimney</td>
1236           </tr>
1237          </table>
1238         </td>
1239        </tr>
1240
1241        <tr>
1242         <td nowrap valign=top><tt>34</tt>..<tt>39</tt>&nbsp; </td>
1243         <td align=left>steel mill</td>
1244        </tr>
1245
1246        <tr>
1247         <td nowrap valign=top><tt>3A</tt>..<tt>3B</tt>&nbsp; </td>
1248         <td align=left>bank (temperate climate)</td>
1249        </tr>
1250
1251        <tr>
1252         <td nowrap valign=top><tt>3C</tt>..<tt>3F</tt>&nbsp; </td>
1253         <td align=left>food processing plant</td>
1254        </tr>
1255
1256        <tr>
1257         <td nowrap valign=top><tt>40</tt>..<tt>47</tt>&nbsp; </td>
1258         <td align=left>paper mill</td>
1259        </tr>
1260
1261        <tr>
1262         <td nowrap valign=top><tt>48</tt>..<tt>58</tt>&nbsp; </td>
1263         <td align=left>gold mine
1264          <table>
1265           <tr>
1266            <td nowrap valign=top><tt>4F</tt>&nbsp; </td>
1267            <td align=left>wheel tower when not animated</td>
1268           </tr>
1269           <tr>
1270            <td nowrap valign=top><tt>58</tt>&nbsp; </td>
1271            <td align=left>wheel tower when animated; animation state in m7 bits 5..0; m7 bit 6 set = sound already generated</td>
1272           </tr>
1273          </table></td>
1274        </tr>
1275
1276        <tr>
1277         <td nowrap valign=top><tt>59</tt>..<tt>5A</tt>&nbsp; </td>
1278         <td align=left>bank (sub-arctic or sub-tropical climate)</td>
1279        </tr>
1280
1281        <tr>
1282         <td nowrap valign=top><tt>5B</tt>..<tt>63</tt>&nbsp; </td>
1283         <td align=left>diamond mine</td>
1284        </tr>
1285
1286        <tr>
1287         <td nowrap valign=top><tt>64</tt>..<tt>73</tt>&nbsp; </td>
1288         <td align=left>iron ore mine</td>
1289        </tr>
1290
1291        <tr>
1292         <td nowrap valign=top><tt>74</tt></td>
1293         <td align=left>fruit plantation</td>
1294        </tr>
1295
1296        <tr>
1297         <td nowrap valign=top><tt>75</tt></td>
1298         <td align=left>rubber plantation</td>
1299        </tr>
1300
1301        <tr>
1302         <td nowrap valign=top><tt>76</tt>..<tt>77</tt>&nbsp; </td>
1303         <td align=left>water supply</td>
1304        </tr>
1305
1306        <tr>
1307         <td nowrap valign=top><tt>78</tt></td>
1308         <td align=left>water tower</td>
1309        </tr>
1310
1311        <tr>
1312         <td nowrap valign=top><tt>79</tt>..<tt>7C</tt>&nbsp; </td>
1313         <td align=left>factory (sub-tropical climate)</td>
1314        </tr>
1315
1316        <tr>
1317         <td nowrap valign=top><tt>7D</tt>..<tt>80</tt>&nbsp; </td>
1318         <td align=left>lumber mill</td>
1319        </tr>
1320
1321        <tr>
1322         <td nowrap valign=top><tt>81</tt>..<tt>82</tt>&nbsp; </td>
1323         <td align=left>candyfloss forest
1324          <table>
1325           <tr>
1326            <td nowrap valign=top><tt>82</tt>&nbsp; </td>
1327            <td align=left>candyfloss 'trees' cut down</td>
1328           </tr>
1329          </table>
1330         </td>
1331        </tr>
1332
1333        <tr>
1334         <td nowrap valign=top><tt>83</tt>..<tt>86</tt>&nbsp; </td>
1335         <td align=left>sweet factory</td>
1336        </tr>
1337
1338        <tr>
1339         <td nowrap valign=top><tt>87</tt>..<tt>88</tt>&nbsp; </td>
1340         <td align=left>battery farm
1341          <table>
1342           <tr>
1343            <td nowrap valign=top><tt>88</tt>&nbsp; </td>
1344            <td align=left>batteries 'reaped'</td>
1345           </tr>
1346          </table>
1347         </td>
1348        </tr>
1349
1350        <tr>
1351         <td nowrap valign=top><tt>89</tt></td>
1352         <td align=left>cola wells</td>
1353        </tr>
1354
1355        <tr>
1356         <td nowrap valign=top><tt>8A</tt>..<tt>8D</tt>&nbsp; </td>
1357         <td align=left>toy shop</td>
1358        </tr>
1359
1360        <tr>
1361         <td nowrap valign=top><tt>8E</tt>..<tt>93</tt>&nbsp; </td>
1362         <td align=left>toy factory
1363          <table>
1364           <tr>
1365            <td nowrap valign=top><tt>8F</tt>&nbsp; </td>
1366            <td align=left>Animated part; animation state in m7 (valid range <tt>00</tt>..<tt>31</tt>)<br>
1367                         Tile animation is started (m4 zeroed) on the periodic processing.<br>
1368                         While the animation is in progress, m4 holds the number
1369                         of animation cycles that have already taken place.<br>
1370                         when this number reaches 8 the animation is stopped.</td>
1371           </tr>
1372          </table>
1373         </td>
1374        </tr>
1375
1376        <tr>
1377         <td nowrap valign=top><tt>94</tt>..<tt>9B</tt>&nbsp; </td>
1378         <td align=left>plastic fountains (various stages of cyclic animation)</td>
1379        </tr>
1380
1381        <tr>
1382         <td nowrap valign=top><tt>9C</tt>..<tt>9F</tt>&nbsp; </td>
1383         <td align=left>fizzy drink factory</td>
1384        </tr>
1385
1386        <tr>
1387         <td nowrap valign=top><tt>A0</tt>..<tt>A3</tt>&nbsp; </td>
1388         <td align=left>bubble generator
1389          <table>
1390           <tr>
1391            <td nowrap valign=top><tt>A1</tt>&nbsp; </td>
1392            <td align=left>generators</td>
1393           </tr>
1394           <tr>
1395            <td nowrap valign=top><tt>A2</tt>&nbsp; </td>
1396            <td align=left>bubble capture facility; animation state in m7 (valid range <tt>00</tt>..<tt>27</tt>)</td>
1397           </tr>
1398          </table>
1399         </td>
1400        </tr>
1401
1402        <tr>
1403         <td nowrap valign=top><tt>A4</tt>..<tt>A6</tt>&nbsp; </td>
1404         <td align=left>toffee quarry
1405          <table>
1406           <tr>
1407            <td nowrap valign=top><tt>A5</tt>&nbsp; </td>
1408            <td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>45</tt>)</td>
1409           </tr>
1410          </table>
1411         </td>
1412        </tr>
1413
1414        <tr>
1415         <td nowrap valign=top><tt>A7</tt>..<tt>AE</tt>&nbsp; </td>
1416         <td align=left>sugar mine
1417          <table>
1418           <tr>
1419            <td nowrap valign=top><tt>AE</tt>&nbsp; </td>
1420            <td align=left>animated part; animation state in m3 (valid range <tt>00</tt>..<tt>5F</tt>)</td>
1421           </tr>
1422          </table>
1423         </td>
1424        </tr>
1425        <tr>
1426         <td nowrap valign=top><tt>AF</tt>..<tt>1FF</tt>&nbsp; </td>
1427         <td align=left>NewGRF industries industry</td>
1428        </tr>
1429       </table>
1430      </li>
1431      <li>m6 bits 5..3: random triggers (NewGRF)</li>
1432      <li>m6 bit 2: bit 8 of type (see m5)</li>
1433      <li>m7: animation frame</li>
1434     </ul>
1435    </td>
1436   </tr>
1437
1438   <tr bgcolor="#CCCCCC">
1439    <td valign=top nowrap><strong><a name="Class9"><tt> 9</tt></a></strong></td>
1440    <td><strong>Tunnel / bridge</strong></td>
1441   </tr>
1442   <tr>
1443    <td valign=top nowrap>&nbsp;</td>
1444    <td>
1445     <ul>
1446      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a></li>
1447      <li style="color: blue">m2 bits 7..0: custom road bridge heads (flat bridge heads only)<br>
1448       Road/tram bits below are XORed with the axial bridge direction road bits.<br>
1449       A non-custom bridge head configuration will have a value of 0.
1450       <ul>
1451        <li>m2 bits 7..4: Road bits<br>
1452            Valid only if m7 bit 6 is set
1453        </li>
1454        <li>m2 bits 3..0: Tram bits<br>
1455            Valid only if m7 bit 7 is set
1456        </li>
1457       </ul>
1458       <table style="color: blue">
1459        <tr>
1460         <td align=left>bit 0: </td>
1461         <td>NW piece</td>
1462        </tr>
1463        <tr>
1464         <td align=left>bit 1: </td>
1465         <td>SW piece</td>
1466        </tr>
1467        <tr>
1468         <td align=left>bit 2: </td>
1469         <td>SE piece</td>
1470        </tr>
1471        <tr>
1472         <td align=left>bit 3: </td>
1473         <td>NE piece</td>
1474        </tr>
1475       </table>
1476      </li>
1477      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of tram</li>
1478      <li>m3 bits 3..0: <a href="#TrackType">track type</a> for railway</li>
1479      <li>m5 bit 4: pbs reservation state for railway</li>
1480      <li>m5 bit 7 clear: tunnel entrance/exit</li>
1481      <li>m5 bit 7 set: bridge ramp
1482       <ul>
1483        <li>m6 bits 5..2: <a name="BridgeType">bridge type</a>:
1484         <table>
1485          <tr>
1486           <th align=left>Type&nbsp;</th>
1487           <th align=left>Max. speed (mph)&nbsp;</th>
1488           <th align=left>Description</th>
1489          </tr>
1490
1491          <tr>
1492           <td nowrap valign=top><tt>0</tt>&nbsp; </td>
1493           <td align=center>20</td>
1494           <td align=left>wooden</td>
1495          </tr>
1496
1497          <tr>
1498           <td nowrap valign=top><tt>1</tt>&nbsp; </td>
1499           <td align=center>30</td>
1500           <td align=left>concrete</td>
1501          </tr>
1502
1503          <tr>
1504           <td nowrap valign=top><tt>2</tt>&nbsp; </td>
1505           <td align=center>40</td>
1506           <td align=left>girder, steel</td>
1507          </tr>
1508
1509          <tr>
1510           <td nowrap valign=top><tt>3</tt>&nbsp; </td>
1511           <td align=center>50</td>
1512           <td align=left>suspension, concrete</td>
1513          </tr>
1514
1515          <tr>
1516           <td nowrap valign=top><tt>4</tt>&nbsp; </td>
1517           <td align=center>60</td>
1518           <td align=left>suspension, steel</td>
1519          </tr>
1520
1521          <tr>
1522           <td nowrap valign=top><tt>5</tt>&nbsp; </td>
1523           <td align=center>70</td>
1524           <td align=left>suspension, steel</td>
1525          </tr>
1526
1527          <tr>
1528           <td nowrap valign=top><tt>6</tt>&nbsp; </td>
1529           <td align=center>100</td>
1530           <td align=left>cantilever, steel</td>
1531          </tr>
1532
1533          <tr>
1534           <td nowrap valign=top><tt>7</tt>&nbsp; </td>
1535           <td align=center>130</td>
1536           <td align=left>cantilever, steel</td>
1537          </tr>
1538
1539          <tr>
1540           <td nowrap valign=top><tt>8</tt>&nbsp; </td>
1541           <td align=center>150</td>
1542           <td align=left>cantilever, steel</td>
1543          </tr>
1544
1545          <tr>
1546           <td nowrap valign=top><tt>9</tt>&nbsp; </td>
1547           <td align=center>160</td>
1548           <td align=left>girder, steel</td>
1549          </tr>
1550
1551          <tr>
1552           <td nowrap valign=top><tt>A</tt>&nbsp; </td>
1553           <td align=center>200</td>
1554           <td align=left>tubular, steel</td>
1555          </tr>
1556
1557          <tr>
1558           <td nowrap valign=top><tt>B</tt>&nbsp; </td>
1559           <td align=center>320</td>
1560           <td align=left>tubular, steel</td>
1561          </tr>
1562
1563          <tr>
1564           <td nowrap valign=top><tt>C</tt>&nbsp; </td>
1565           <td align=center>380</td>
1566           <td align=left>tubular, silicon</td>
1567          </tr>
1568         </table>
1569        </li>
1570       </ul>
1571      </li>
1572      <li style="color: blue">m5 bits 6..5: signal simulation (signals on bridge/tunnels patch)
1573       <table style="color: blue">
1574        <tr>
1575         <td><tt>0</tt>&nbsp;</td>
1576         <td>no signal simulation</td>
1577        </tr>
1578
1579        <tr>
1580         <td><tt>1</tt>&nbsp;</td>
1581         <td>signal simulation entrance (bit 5 set)</td>
1582        </tr>
1583
1584        <tr>
1585         <td><tt>2</tt>&nbsp;</td>
1586         <td>signal simulation exit (bit 6 set)</td>
1587        </tr>
1588       </table>
1589       If signal simulation entrance or exit:
1590       <ul>
1591        <li>m6 bit 6: set = PBS signals, clear = block signals</li>
1592        <li>m6 bit 1: set = semaphore signals, clear = light signals</li>
1593        <li>m6 bit 0: set = signal shows green, clear = signal shows red</li>
1594        <li>m2 bit 15: for bridge entrances only: storage for visual red/green state of signals starting from 15 is allocated outside the map array</li>
1595        <li>m2 bits 14..0: for bridge entrances only: for signals 0..14 on bridge, signal is visually red if corresponding bit in 0..14 is set</li>
1596       </ul>
1597      </li>
1598      <li>m5 bits 3..2: transport type
1599       <table>
1600        <tr>
1601         <td><tt>0</tt>&nbsp;</td>
1602         <td>railway</td>
1603        </tr>
1604
1605        <tr>
1606         <td><tt>1</tt>&nbsp;</td>
1607         <td>road</td>
1608        </tr>
1609
1610        <tr>
1611         <td><tt>2</tt>&nbsp;</td>
1612         <td>water</td>
1613        </tr>
1614       </table>
1615      </li>
1616      <li>m5 bits 1..0: direction onto the bridge / out of the tunnel
1617       <table>
1618        <tr>
1619         <td><tt>0</tt>&nbsp; </td>
1620         <td>NE</td>
1621        </tr>
1622
1623        <tr>
1624         <td><tt>1</tt>&nbsp; </td>
1625         <td>SE</td>
1626        </tr>
1627
1628        <tr>
1629         <td><tt>2</tt>&nbsp; </td>
1630         <td>SW</td>
1631        </tr>
1632
1633        <tr>
1634         <td><tt>3</tt>&nbsp; </td>
1635         <td>NW</td>
1636        </tr>
1637       </table>
1638      </li>
1639      <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road</li>
1640      <li>m7 bit 5 set = on snow or desert</li>
1641      <li>m7 bits 7..6: present road types for road</li>
1642     </ul>
1643    </td>
1644   </tr>
1645
1646   <tr bgcolor="#CCCCCC">
1647    <td valign=top nowrap><strong><a name="ClassA"><tt> A</tt></a></strong></td>
1648    <td><strong><tt>Objects</tt></strong></td>
1649   </tr>
1650   <tr>
1651    <td valign=top nowrap>&nbsp;</td>
1652    <td>
1653     <ul>
1654      <li>m1 bits 6..5 : Water class (sea, canal, river or land)</li>
1655      <li>m1 bits 4..0: <a href="#OwnershipInfo">owner</a> of the object (for lighthouses and transmitters normally <tt>10</tt>)</li>
1656      <li>m2: index into the array of objects, bits 0 to 15 (upper bits in m5)</li>
1657      <li>m3: random bits</li>
1658      <li>m5: index into the array of objects, bits 16 to 23 (lower bits in m2)</li>
1659      <li>m7: animation counter</li>
1660     </ul>
1661    </td>
1662   </tr>
1663   <tr>
1664    <td colspan=2>Classes <tt>B</tt> through <tt>F</tt> are reserved. The presence
1665       of a tile in one of the reserved classes will crash OTTD.</td>
1666   </tr>
1667  </table>
1668
1669
1670  <hr>
1671  Original Copyright &copy; 2003 by Marcin Grzegorczyk for TTDLX.<br>
1672  Transport Tycoon and Transport Tycoon Deluxe are Copyright &copy; by Chris Sawyer.<br>
1673  All the other trademarks are the property of their respective owners.<br>
1674 </body>
1675
1676 </html>