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func_button

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C++ Class hierarchy
CBaseButton
↳CBaseToggle
↳CBaseEntity
C++ buttons.cpp

func_button is a brush entity available in all Source Source games.

It is designed to be used for a player-usable button. When +used by the player, it moves to a pressed position. For an example of a func_button used to make a keypad, see the button_keypad prefab.

Tip.pngTip:If you have a button over a prop, which fires outputs by damaging the button brush, you might as well use a prop_dynamic with its "OnTakeDamage" output. This will use the prop's collision mesh as the button, instead of a brush.
This is very useful for small items, since small button brushes may compile with missing faces, due to a vbsp bug[Clarify].

Keyvalues

Note.pngNote:For Keyvalues and Inputs affecting brush rendering, see Brush entity/Rendering related keyvalues and inputs


Name (targetname) <string>[ Edit ]
The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g. parentname or target).
Also displayed in Hammer's 2D views and Entity Report.
See also:  Generic Keyvalues, Inputs and Outputs available to all entities

Glow Entity (glow) <targetname> (only in Left 4 Dead seriesLeft 4 Dead series)
The name of an entity that will get a +use glow for this button.
Note.pngNote:Left 4 Dead 2 the "Hand Extend" animation will play when looking at Glow Entity.
Icon-Bug.pngBug:The Engine cannot properly find the Glow entity if it's off-grid. It will pick several entities close to where the supposed off-grid glow entity is.  [todo tested in ?]
Use Look-At Limit (min_use_angle) <string> (in all games since Counter-Strike: Global Offensive) (also in Garry's Mod)
Limit the usable look-at angle. -1 is looking directly away, 0 is looking perpendicular, 1 is looking directly at. To allow a deviation of at most 45°, insert cos(45°) ≈ 0.7071 or for 5° use cos(5°) ≈ 0.9962 (see dot product).
Move Direction (Pitch Yaw Roll) (movedir) <angle>
Specifies the direction of motion to move when the button is used.
Delay Before Reset (-1 stay) (wait) <integer>
Amount of time, in seconds, after the button has been pressed before it returns to the starting position. Once it has returned, it can be used again. If the value is set to -1, the button never returns.
Speed (speed) <integer>
The speed that the button moves, in units per second.
Health (Obsolete) (health) <integer>
Legacy method of specifying whether or not the button can be shot to activate it. Use the Damage Activates spawnflag instead.
Lip (lip) <integer>
The amount, in inches, of the button to leave sticking out of the wall it recedes into when pressed. Negative values make the button recede even further into the wall.
Sounds (sounds) <integer choices>
Make this button emit a sound when pressed.
Note.pngNote:The list below was made for Half-Life 2. All games support this keyvalue, but some don't have a number of these sound files. To edit these sounds, look for Buttons.snd (followed by a number from the Value column in this table) in hl2/scripts/game_sounds_world.txt or your game's appropriate Soundscript file.
Choices 
Value Description Default Sound
Buttons
0 None (Silent) common/null.wav
1 Big zap & Warmup buttons/button1.wav
2 Access Denied buttons/button2.wav
3 Access Granted buttons/button3.wav
4 Quick Combolock buttons/button4.wav
5 Power Deadbolt 1 buttons/button5.wav
6 Power Deadbolt 2 buttons/button6.wav
7 Plunger buttons/button7.wav
8 Small zap buttons/button8.wav
9 Keycard Sound buttons/button9.wav
10 Buzz buttons/button10.wav
11 Buzz Off buttons/button11.wav
12 latch locked doors/latchlocked2.wav
13 Latch Unlocked doors/latchunlocked1.wav
14 Lightswitch buttons/lightswitch2.wav
15 small bleek buttons/button15.wav
16 small deny buttons/button16.wav
17 small doop buttons/button17.wav
18 small tech deny buttons/button18.wav
19 click and combine screen fuzz buttons/button19.wav
20 roomy beep buttons/button20.wav
Levers
21 lever or wheel: turn + move sqeek buttons/lever1.wav
22 lever or wheel: latch + release gas buttons/lever2.wav
23 lever or wheel: ratchet + sqeek buttons/lever3.wav
24 lever or wheel: large ratchet buttons/lever4.wav
25 lever or wheel: clanky + gas release buttons/lever5.wav
26 lever or wheel: latch + large metal thud buttons/lever6.wav
27 lever or wheel: smaller ratchet buttons/lever7.wav
28 lever or wheel: smaller lever move buttons/lever8.wav
New buttons
31 shock buzz buttons/button21.wav
32 clickbeep buttons/button22.wav
33 tech blip buttons/button23.wav
34 clickbeepbeep open buttons/button24.wav
35 small high blip buttons/button12.wav
36 small tech fuzz blip buttons/button13.wav
37 small click bleep (change to lightswitch) buttons/button14.wav
Combine Buttons
40 combine door lock - locked buttons/combine_button_locked.wav
41 combine blip growl buttons/combine_button1.wav
42 combine squick growl buttons/combine_button2.wav
43 combine whine purr buttons/combine_button3.wav
44 combine click talk buttons/combine_button4.wav
45 combine click growl fizz buttons/combine_button5.wav
46 combine click fizz (deny) buttons/combine_button6.wav
47 combine click talker buttons/combine_button7.wav
Locked Sound (locked_sound) <integer choices>
Sound played when the player tries to use the button, and fails because it's locked.
Choices 
Value Description Default Sound
0 None common/null.wav
2 Access Denied buttons/button2.wav
8 Small zap buttons/button8.wav
10 Buzz buttons/button10.wav
11 Buzz Off buttons/button11.wav
12 Latch Locked doors/latchlocked2.wav
Unlocked Sound (unlocked_sound) <integer choices>
Sound played when the button is unlocked.
Confirm:doesn't seem to work?
Choices 
Value Description Default Sound
0 None common/null.wav
1 Big zap & Warmup buttons/button1.wav
3 Access Granted buttons/button3.wav
4 Quick Combolock buttons/button4.wav
5 Power Deadbolt 1 buttons/button5.wav
6 Power Deadbolt 2 buttons/button6.wav
7 Plunger buttons/button7.wav
8 Small zap buttons/button8.wav
9 Keycard Sound buttons/button9.wav
10 Buzz buttons/button10.wav
13 Latch Unlocked doors/latchunlocked1.wav
14 Lightswitch buttons/lightswitch2.wav
Locked Sentence (locked_sentence) <integer choices>
A sentence played when the player tries to use the button, and fails because it's locked.
Choices 
Value Description
0 None
1 Gen. Access Denied
2 Security Lockout
3 Blast Door
4 Fire Door
5 Chemical Door
6 Radiation Door
7 Gen. Containment
8 Maintenance Door
9 Broken Shut Door
Unlocked Sentence (unlocked_sentence) <integer choices>
A sentence played when the button is unlocked.
Choices 
Value Description
0 None
1 Gen. Access Granted
2 Security Disengaged
3 Blast Door
4 Fire Door
5 Chemical Door
6 Radiation Door
7 Gen. Containment
8 Maintenance area
Master (Obsolete) (master) <targetname>
Legacy support: The name of a master entity. If the master hasn't been activated, this button cannot be pressed.

Flags

Don't move : [1]
Toggle : [32]
Makes the button fire the outputs "OnIn" and "OnOut" if being pressed repeatedly.
Does not fire "OnOut" when "Damage Activates" is also set. As a workaround you can have this button "press" another button somewhere out of reach, which only has the "toggle" and "don't move" flag.
Touch Activates : [256]
Damage Activates : [512]
If set, makes the button fire "OnPressed" when damaged. Honors the lock like any other input option.
"OnDamaged" would fire any time the button is pressed, even if locked.
Use Activates : [1024]
Starts locked : [2048]
Sparks : [4096]
Non-solid : [16384] (in all games since Counter-Strike: Global Offensive(also in Garry's Mod))
Tip.pngTip:Use func_rot_button instead for non-solid buttons in other games, or use a %CompileNonSolid material.
Icon-Bug.pngBug:In Half-Life 2 series nonsolid buttons may cause you to interact with things besides or behind the buttons.

Inputs

Lock
Lock the button, preventing it from functioning.
Icon-Bug.pngBug:Do not lock while pressed; it will not return when unlocked.  [todo tested in ?]
Unlock
Unlock the button, allowing it to function.
Press
Activate the button as if it was pressed.
PressIn
Activate the button as if it was pressed, sending it to the bottom position.
PressOut
Unpress the button, sending it to the top position. Fire OnPressed output.

Outputs

OnDamaged
!activator = entity that damages this
!caller = this entity
Fired when the button is damaged, regardless of whether it is locked, or if the "Damage Activates" is set.
PlacementTip.pngExample:This could be used to destroy a locked button to open doors, while pressing "+use" would play a "Deny" sound.
OnPressed
!activator = player that pressed the button or activator of the input causing this
!caller = this entity
Fired when the button is activated through any means set by the flags.
OnUseLocked
!activator = player that uses the button
!caller = this entity
Fired when the button is used while locked.
OnIn
!activator = entity that caused the press or entity that last damaged the button[confirm]
!caller = this entity
Fired when the button reaches the in/pressed position.
OnOut
!activator = entity that caused the press or entity that last damaged the button[confirm]
!caller = this entity
Fired when the button reaches the out/released position. "Delay Before Reset" will fire this output, after the delay is over. If the "Toggle" flag is set, pressing the button again will fire this output.

See also

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