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momentary_rot_button is a brush entity available in all Source games. It is designed to be used for rotating wheels, where the player can rotate them to arbitrary positions before stopping.


Speed (deg/sec) <integer>
The amount, in degrees, that the wheel turns per second.
Master (Obsolete) <string>
Legacy support: The name of a master entity. If the master hasn't been activated, this button cannot be used.
Sounds <choices>
Sound to play after being turned.
Value Description
0 None
1 Big zap & Warmup
2 Access Denied
3 Access Granted
4 Quick Combolock
5 Power Deadbolt 1
6 Power Deadbolt 2
7 Plunger
8 Small zap
9 Keycard Sound
21 Squeaky
22 Squeaky Pneumatic
23 Ratchet Groan
24 Clean Ratchet
25 Gas Clunk
Distance <integer>
The maximum amount, in degrees, that the wheel is allowed to rotate.
Auto-return speed <integer>
If the 'Toggle' spawnflag is not set, the speed at which the wheel auto-returns when left alone, in degrees per second.
Minimum Light Level <string>
The minimum level of ambient light that hits this brush.
Start Position <float>
Postion when spawned. The value is a range between 0.0 and 1.0, where 0 is the unrotated position and 1 is the rotated position + 'Distance'.
Start Direction <choices>
Which way the wheel turns.
  • -1 : Forward
  • 1 : Backward
Solid BSP <boolean>
Set this if this brush is in hierarchy with a moving object of some kind, and the player can stand on this brush.


Name (targetname) <string>
The targetname that other entities refer to this entity by.
Entity Scripts (vscripts) <scriptlist> (New with Left 4 Dead 2)
Space delimited list of VScript files (without file extension) that are executed after all entities have spawned. The scripts are all executed in the same script scope, later ones overwriting any identical variables and functions.
Script think function (thinkfunction) <string> (New with Left 4 Dead 2)
Name of a function in this entity's script which will be called automatically every 100 milliseconds (ten times a second) for the duration of the script. It can be used to create timers or to simulate autonomous behavior. The return value (if present) will set the time until the next call.
Note:Try to avoid expensive operations in this function, as it may cause performance problems.


Parent (parentname) <targetname>
Specifies a movement parent. An entity will maintain its initial offset from its parent. An attachment point can be added to the end of the name, separated by a comma.


Origin (X Y Z) (origin) <origin>
The position of this entity's center in the world. Rotating entities typically rotate around their origin.


Pitch Yaw Roll (Y Z X) (angles) <angle>
This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.


Render Mode (rendermode) <choices>
Set a non-standard rendering mode on this entity.
Render FX / Transparency (0 - 255) (renderamt) <integer>
Transparency amount, requires a Render Mode other than Normal. 0 is invisible, 255 is fully visible.
Render Color (R G B) (rendercolor) <color255>
Color tint.
Disable Receiving Shadows (disablereceiveshadows) <boolean>
Prevent the entity from receiving shadows on itself.


Render FX (renderfx) <choices>
Preset pattern of appearance effects.
To do: 18-21, 25


  • 1 : Not Solid
  • 32 : Toggle (Disable Auto Return)
  • 64 : X Axis
  • 128 : Y Axis
  • 1024 : Use Activates
  • 2048 : Starts locked
  • 8192 : Jiggle when used while locked


Lock the button, preventing it from functioning.
Unlock the button, allowing it to function.
SetPosition <string>
Move to a position. The parameter must be a value between 0 and 1, where 0 is the unrotated position and 1 is the rotated position + 'Distance'.
SetPositionImmediately <string>
Immediately teleport to a position. The parameter must be a value between 0 and 1, where 0 is the unrotated position and 1 is the rotated position + 'Distance'.


Removes this entity and any entities parented to it from the world.
Functions the same as Kill, although this entity and any entities parented to it are killed on the same frame, being marginally faster than Kill.
AddOutput <string>
Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.
Format: <key> <value>
Format: <output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire, -1 means infinite>
FireUser1 to FireUser4
Fire the OnUser outputs; see User Inputs and Outputs.
Use  !FGD
Same as a player invoking +use; may not do anything. Can also be invoked by creating an output that does not specify an input.
This input is not included in Valve's FGDs.
RunScriptFile <script> (New with Left 4 Dead 2)
Execute a VScript file from disk, without file extension. The script contents are merged with the script scope of the receiving entity.
RunScriptCode <string> (New with Left 4 Dead 2)
Execute a string of VScript source code in the scope of the entity receiving the input. String quotation may be needed when fired via console.
Bug: In <Left 4 Dead 2>, the code is executed in the script scope of the entity that fires the output, not the one receiving the input.
Warning: Never try to pass string parameters to a script function with this input. It will corrupt the VMF structure because of the nested quotation marks, which then must be removed manually with a text editor.
CallScriptFunction <string> (New with Left 4 Dead 2) !FGD
Execute a VScript function in the scope of the receiving entity.
SetLocalOrigin <coordinates> (New with Alien Swarm) !FGD
Send this entity to a spot in the map. If the entity is parented to something, it will be offset from the parent by this amount.
SetLocalAngles <angles> (New with Alien Swarm) !FGD
Set this entity's angles.


SetParent <string>
Move with this entity. See Entity Hierarchy (parenting).
SetParentAttachment <string>
Change this entity to attach to a specific attachment point on its parent. The entity will teleport so that the position of its root bone matches that of the attachment. Entities must be parented before being sent this input.
SetParentAttachmentMaintainOffset <string>
As above, but without teleporting. The entity retains its position relative to the attachment at the time of the input being received.
Removes this entity from the the movement hierarchy, leaving it free to move independently.


Alpha <integer>
Sets the entity's transparency to a number from 0 (invisible) to 255 (fully visible). Requires the entity to have its Render Mode (rendermode) set to a number other than 0.
Color <color255>
Sets an RGB color for the entity.


Position <integer>
Fired whenever the button moves. The output is the position of button from 0 to 1, where 0 is the unrotated position and 1 is the rotated position + 'Distance'.
OnPressed <integer>
Fired when the button is first pressed.
OnUnpressed <integer>
Fired when the button is first released from being pressed.
Fired when the button has reached position 1, the rotated position + 'Distance'.
Fired when the button has reached position 0, the unrotated starting position.
Fired whenever the button reaches a goal position: i.e. when it becomes open, becomes closed, or reaches the point specified by a 'Set<code>Position</code>' input.


OnUser1 to OnUser4
These Outputs each fire in response to the firing of the like-numbered FireUser1 to FireUser4 Input; see User Inputs and Outputs.
OnKilled  (Only in the Left 4 Dead series)
This Output fires when the entity is killed and removed from the game.

See also