Thing

From DoomWiki.org

Revision as of 15:42, 11 January 2005 by Fredrik (talk | contribs)


In Doom, things are used to represent players, monsters, pick-ups, and projectiles. Inside the game, these are known as actors. There are three ways to get an actor into your map.

DoomEd numbers are the numbers used in the editor to represent an actor. When the map is loaded, an actor that corresponds to that number will be spawned at the location of that map thing. Although many actors have DoomEd numbers, not all of them do. For instance, a blue key card has a DoomEd number, but a rocket flying through the air does not.

Spawn numbers are the numbers used by specials such as Thing Spawn to spawn actors in the game once the user has started playing the map. Although DoomEd numbers and spawn numbers both describe actors, they are not interchangeable—you must not use a spawn number on a map thing, and you must not use a DoomEd number for instance as a Thing_Spawn parameter.

ZDoom editing

Actor Names are the actual names each actor has internally (to test these you may want to try out the summon console command). These are used with the functions SpawnSpot and Spawn which allow you to spawn any actor available with Thing_Spawn and also all other actors (though some actors aren't meant to be spawned) such as cameras, scenery or whatever you might require.

If you create a new actor with the DECORATE lump, you can specify both the spawn number (SpawnNum), and the DoomEd number (DoomEdNum). The name you give the new DECORATE item is also its actor name, so you can also spawn it using that.

THINGS structure

Doom offset</td> Hexen offset Size (bytes) Description
x 0 2 Thing id (tid)
0 2 2 X position
2 4 2 Y position
x 6 2 Starting height
4 8 2 Angle facing
6 10 2 DoomEd thing type
8 12 2 Flags (see below)
x 14 1 Hexen/ZDoom special type
x 15 1 Argument 1
x 16 1 Argument 2
x 17 1 Argument 3
x 18 1 Argument 4
x 19 1 Argument 5

Doom Format things are 10 bytes in size, while Hexen/ZDoom format things are 20 bytes in size.

Flags

Thing Flags are in this format for Hexen/ZDoom: Thing Flags are in this format for Doom: Thing Flags are in this format for Strife:
bit hex description
00x0001Thing is on Skill levels 1 & 2
10x0002Thing is on Skill level 3
20x0004Thing is on Skill levels 4 & 5
30x0008Thing is Deaf
40x0010Thing is dormant until activated
80x0100Thing is in Single Player
90x0200Thing is in Co-Op
100x0400Thing is in Deathmatch
110x0800Thing is 25% translucent
120x1000Makes the thing invisible
130x2000Friendly monster
140x4000Thing stands still (only useful for specific Strife monsters or friendlies)
bit hex description
00x0001Thing is on Skill levels 1 & 2
10x0002Thing is on Skill level 3
20x0004Thing is on Skill levels 4 & 5
30x0008Thing is Deaf
40x0010Thing is not in Single player
50x0020Thing is not in Deathmatch
60x0040Thing is not in Coop
70x0080Friendly monster
bit hex description
00x0001Thing is on Skill levels 1 & 2
10x0002Thing is on Skill level 3
20x0004Thing is on Skill levels 4 & 5
30x0008Thing stands still (only useful for specific Strife monsters)
40x0010Thing is not in Single player
50x0020Thing is Deaf
60x0040Friendly monster
80x0100Thing is 25% translucent
90x0200Makes the thing invisible