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/tutorials/Flags

Flags

Flags determine the properties of an entity in Doom. For example, a sector flag may determine the amount of damage done in case of an acid floor, whether or not it should count as a secret, etc. Listed below are the regular and Boom flags for sectors, things and sidedefs.

Sector Flags

Description	Value
Normal	0
Light random off	1
Light blinks 0.5 sec	2
Light blinks 1.0 sec	3
-10/20% health, light blinks 0,5 sec	4
-5/10% health	5
-2/5% health	7
Light pulsates	8
Door closes 30 secs after start level	10
-10/20% health, below 11% health the level ends	11
Light blinks 0,5 sec synchronised	12

Description	Value
Light blinks 1.0 sec synchronised	13
Ceiling up 300 secs after start level	14
-10/20% health	16
Light flickers randomly	17
-5% health	32
-10% health	64
-20% health	96
Counts towards "secrets" tally	128
Sector friction enabled, see note below	256
Sector wind enabled, see note below	512

Shown in the table above are the descriptions of sector tags and their values. Sector tags can be combined by adding their values, eg "-20% health" and "secret" has a value of 96+128=224. A sector's tag can be set with CLED, eg "cled mywad.wad sector(mapnumber,sectornumber).type=value".

Important: tagging a sector with value 256 and 512 (friction and wind) are not enough to produce the desired effect: see the section "ice / mud / wind". These effects can also be cancelled by changing the sector's tag to normal by a texture-change only trigger.

Linedef Flags

Boom has one new linedef flag called "PassThru" with a decimal value of 512 - which translates to a hexidecimal value of 200. This will allow "push" or "switch" action to pass through a trigger, allowing the player to activate more than one trigger with one action. To enable it, just add a hexidecimal value of 200 to the flag status of the linedef you want to make "PassThru". You can see the current flag status of a linedef using CLED as a diagnostic (eg. "cled mywad.wad linedef(mapnumber,linedefnumber).flags"). Just add 200 to the existing value with CLED (eg. "cled mywad.wad linedef(mapnumber,linedefnumber).flags=value"), or calculate in decimal numbers and translate later. Thanks to Jim Flynn / Jack Vermeulen for bringing this to my attention! Note that the engine will only allow one action per floor, ceiling or light setting in the same sector. Your typical Windows calculator can translate decimal values into hexidecimal ones.

Description

Dec. value

Hex. value

Impassible
1
1

Block monster
2
2

2-sided
4
4

Upper pegged
8
8

Lower pegged
16
10

Secret
32
20

Block sound
64
40

Invisible
128
80

On auto-map
256
100

Pass-through
512
200

Thing Flags

Boom has also two new thing flags, called "not in DM" with a value of 32, and "not in COOP" with a value of 64. I guess it's obvious as to what these flags do =)

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