forked from openrs2/openrs2
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
4.9 KiB
111 lines
4.9 KiB
# Coordinate system
|
|
|
|
## Summary
|
|
|
|
| Name | Levels | Width (tiles) | Height (tiles) |
|
|
|------------------------|-------:|--------------:|---------------:|
|
|
| World | 4 | 16,384 | 16,384 |
|
|
| BuildArea | 1 or 4 | 104 | 104 |
|
|
| MapSquare | 4 | 64 | 64 |
|
|
| MapSquare (underwater) | 1 | 64 | 64 |
|
|
| Viewport (?) | 1 | 32 | 32 |
|
|
| Zone | 1 | 8 | 8 |
|
|
|
|
## Introduction
|
|
|
|
RuneScape is a three-dimensional tile-based world. The entire world is made up
|
|
of 16,384x16,384 tiles on 4 levels of elevation (ranging from 0 to 3
|
|
inclusive), including the ground level. The X and Z axes range from 0 to
|
|
16,383 inclusive.
|
|
|
|
The Y axis represents the level of elevation, with 0 representing ground
|
|
level. The X and Z axes represent coordinates on the plane - when the world map
|
|
or mini map is plotted in two dimensions, the X axis is the horizontal axis
|
|
(with X increasing from left to right), and the Z axis is the vertical axis
|
|
(with Z increasing from bottom to top).
|
|
|
|
## Map squares
|
|
|
|
The world is split into map squares, each of which contains 64x64 tiles across
|
|
4 levels. Map squares are the granularity of the maps stored in the client's
|
|
cache.
|
|
|
|
Each map square has up to five files in the client's cache:
|
|
|
|
| File name | Name | Description |
|
|
|-----------|-----------------|-----------------------------------------------------------------------|
|
|
| `mX_Z` | Map | Contains floor underlays, overlays, tile heights and flags |
|
|
| `lX_Z` | Locs | Contains locs (walls, wall decoration, scenery and ground decoration) |
|
|
| `umX_Z` | Underwater map | Contains underwater equivalent of the map file |
|
|
| `ulX_Z` | Underwater locs | Contains underwater equivalent of the locs file |
|
|
| `nX_Z` | NPC spawns | Contains NPC spawns for the animated login screen |
|
|
|
|
The underwater files contain a single virtual -1 level used to represent the
|
|
tiles and locs that can be seen beneath translucent water tiles in HD mode. The
|
|
server does not interact with this level, it purely exists for decorative
|
|
purposes.
|
|
|
|
The X and Z coordinates of a map are the coordinates of the origin tile divided
|
|
by 64. Internally, the client combines these two values into a single ID by
|
|
calculating `(X << 8) | Z`.
|
|
|
|
## Zones
|
|
|
|
Each map square is split into zones, each of which contains 8x8 tiles across a
|
|
single level. Zones are the granularity used for most packets that interact with
|
|
the world - for example, spawning locs and obj stacks. An entire zone may be
|
|
reset and populated with dynamic locs and obj stacks in two packets.
|
|
|
|
Zones are also the granularity used to build instances, such as player-owned
|
|
houses.
|
|
|
|
The left-hand side of the world (for tiles ranging from X=0 to X=6399 inclusive)
|
|
is used for the static map squares stored in the cache. The right-hand side of
|
|
the world (for tiles from X=6400 above) is used for instances, which are
|
|
dynamically constructed by copying zones from the left side of the world and
|
|
moving/rotating them.
|
|
|
|
## Dungeons
|
|
|
|
Dungeons are typically, but not always, 6,400 Z units above the equivalent
|
|
ground-level areas. 6,400 was likely chosen as this corresponds to 100 map
|
|
squares, meaning a single "1" digit needs to be added to or removed from the
|
|
map's file name to switch between ground level and the corresponding dungeon.
|
|
|
|
## Build area
|
|
|
|
The build area represents the 104x104 group of tiles (or 13x13 group of zones)
|
|
held in the client's memory. Depending on its settings, the client only retains
|
|
the player's current level or retains all four levels.
|
|
|
|
The build area is always zone-aligned. When the area is initially built, it is
|
|
centred around the player's current zone.
|
|
|
|
When the player is within 16 tiles of the edge of the current build area, it is
|
|
rebuilt.
|
|
|
|
## Viewport
|
|
|
|
The viewport (note: unlike the other names in this document, we do not know the
|
|
official Jagex name) is the 32x32 group of tiles, always centred around the
|
|
current player, within which other players and NPCs are visible. Players can
|
|
only see other players and NPCs on the same level as them.
|
|
|
|
## Coordinates
|
|
|
|
When used in a script, the coordinates of a tile are packed into a 32-bit
|
|
integer as follows:
|
|
|
|
| **Field** | (unused) | Level | X | Z |
|
|
|-----------|----------|------:|---:|---:|
|
|
| **Bits** | 2 | 2 | 14 | 14 |
|
|
|
|
The two unused bits are set to zero.
|
|
|
|
Literals in scripts are represented with the X and Z coordinates split into the
|
|
map coordinates and the local coordinates within each map:
|
|
`<level>_<map_x>_<map_z>_<x>_<z>`. For example, (0, 3094, 3107) is written as
|
|
`0_48_48_22_35` in a script.
|
|
|
|
The teleport command uses a similar syntax:
|
|
`::tele <level>,<map_x>,<map_z>,<x>,<z>`.
|
|
|