docs/landscape.html

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