diff --git a/docs/landscape.html b/docs/landscape.html
--- a/docs/landscape.html
+++ b/docs/landscape.html
@@ -4,64 +4,90 @@
-
+
OpenTTD Landscape Internals
+
+ For a graphical representation of the tile-layout have a look at
+ Landscape grid page.
+
Eight attributes (counting "type_height") hold the informations about a tile.
These attributes are referred to as
- "type_height",
- "m1", "m2",
- "m3", "m4",
- "m5", "m6"
- and "m7".
+ "type_height",
+ "m1", "m2",
+ "m3", "m4",
+ "m5", "m6"
+ and "m7".
The most important value is the class of a tile, stored in the upper 4 bits
of the type_height attribute. The lower 4 bits are used to encode the height and
slope data.
- Special Attribute : m6. There are 4 bits of it that are used accross multiple tile classes
+ Frequently repeating patterns:
- -
-
- Bits 7..6 :
-
- Presence and direction of bridge above,
for tiles that support this. |
- | 00 | no bridge |
- | 01 | Axis X (North-East) |
- | 02 | Axis Y (South-West) |
-
+ - m1
+
+ -
+
+ Bits 6..5:
+
+ | The type of water that is on a tile.
+ |
| 00 | Sea |
+ | 01 | Canal |
+ | 02 | River |
+ | 03 | Invalid, i.e. no water on this tile |
+
+ Some tiles, such as houses, reuse these bits of other purposes.
+
+ -
+
+ Bits 4..0:
+
+ | The owner of a tile can be either companies (human or AI) or "Game entities".
+ |
| 00..0E | Normal companies |
+ | 0F | a town owns the tile |
+ | 10 | nobody owns the tile |
+ | 11 | "water" owns the tile |
+ | FF | spectator in MP or in scenario editor |
+
+ Some tiles, such as houses and industries, reuse these bits of other purposes.
+
+
- -
-
- Bits 1..0 :
-
- Only meaningfull in tropic climate.
It contains the definition of the available zones |
- | 00 | normal |
- | 01 | desert |
- | 02 | rain forest |
-
- In any other climate, those 2 bits are free of use.
+ - m6
+
+ -
+
+ Bits 7..6:
+
+ | Presence and direction of bridge above, for tiles that support this. |
+ | 00 | no bridge |
+ | 01 | Axis X (North-East) |
+ | 02 | Axis Y (South-West) |
+
+ Some tiles, such as houses do not support bridges over them and use these bits for other purposes.
+
+ -
+
+ Bits 1..0:
+
+ | Only meaningfull in tropic climate. It contains the definition of the available zones |
+ | 00 | normal |
+ | 01 | desert |
+ | 02 | rain forest |
+
+ In any other climate these 2 bits are theoretically free of use, however using them does not seem useful.
+
+
+
+ - m7:
+ Animation frame/state. Used for houses, industries, objects and stations.
-
- For a graphical representation of the tile-layout have a look at
- Landscape grid page.
-
-
- The owner of a tile, as frequently associated with attribute m1 bits 4..0,
- can be either companies (human or AI) or "Game entities".
- They are identified using:
-
- | 00..0E | Normal companies |
- | 0F | a town owns the tile |
- | 10 | nobody owns the tile |
- | 11 | "water" owns the tile |
- | FF | spectator in MP or in scenario editor |
-
OTTD's class-specific periodic tile processing routine is called once every +256 ticks for each tile.
@@ -708,7 +734,7 @@
- Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).
+ Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).
It allows the replacement of the properties as well as the graphics of houses in the game.
To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.
110 is the count of standard houses. So above 110 means there is a new definition of at least one house
@@ -1525,6 +1551,7 @@
2 |
water |
+
m5 bits 1..0: direction onto the bridge / out of the tunnel
@@ -1569,7 +1596,6 @@
m1 bits 6..5 : Water class (sea, canal, river or land)
m1 bits 4..0: owner of the object (for lighthouses and transmitters normally 10)
m2: index into the array of objects
- m3: animation counter
m5: tile type:
@@ -1600,6 +1626,7 @@
m6 bits 7..6 : Possibility of a bridge above, in the direction specified
m6 bits 1..0 : Tropic zone definition
+ m7: animation counter
diff --git a/docs/landscape_externals.html b/docs/landscape_externals.html
--- a/docs/landscape_externals.html
+++ b/docs/landscape_externals.html
@@ -4,7 +4,7 @@
-
+
OpenTTD Landscape externals
diff --git a/docs/landscape_grid.html b/docs/landscape_grid.html
--- a/docs/landscape_grid.html
+++ b/docs/landscape_grid.html
@@ -1,7 +1,7 @@
-
+
OpenTTD Landscape Internals - #2