prop_dynamic

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prop_dynamic is a point entity available in all Source games. It is used to add a model to the world that can animate itself.

Note.png Note: This entity may also use the deprecated dynamic_prop for the classname, and is used in beta Half-Life 2 maps.
Tip.png Tip: If your model is never going to move and/or requires more detailed lighting, consider using prop_static (which is cheaper).
Note.png Note: To enforce consistency, models with embedded physics data cannot by default be used by prop_dynamic. Use the Hammer model browser's Info tab to check for support. If you intend to use a physics model in non-physics role, use prop_dynamic_override.

In code, it is represented by theCDynamicPropclass, defined in theprops.cppfile.

Uses

  • Buttons can be created by enveloping a prop_dynamic inside an invisible func_button brush, then using the SetAnimation input to play a switching animation.
  • Similarly, levers can be created by enveloping a prop_dynamic inside a func_rot_button (or momentary_rot_button) brush. No animation needed for this - the brush will rotate the prop by itself.
  • A prop_dynamic can be configured to break apart after receiving damage or on cue by using the Break input.
    Bug.png Bug: Health set inside the model will override health set in Hammer!


Keyvalues

DynamicProp:

Default Animation (DefaultAnim) <string>
The animation this prop will play when not doing a random or forced animation.
Randomly Animate (RandomAnimation) <boolean>
Makes the prop randomly select and play animations at intervals defined by the Min/Max Random Anim Time KVs. In between the random animations, it will revert to playing Default Animation.
Min Random Anim Time (MinAnimTime) <float>
Minimum time between random animations.
Max Random Anim Time (MaxAnimTime) <float>
Maximum time between random animations.
Update children (updatechildren) <boolean>
Confirm:A boolean set to true by default. When set to 0, any children attached to this entity as an attachment will not update. (seems like it would not have a practical use...)
Disable Bone Followers (DisableBoneFollowers) <boolean> (in all games since <Source><Source>)
Disables generation of phys_bone_followers for each convex piece the model has in its collision model. phys_bone_followers can quickly eat up the edict count, so this keyvalue can be very helpful in freeing resources. This will however make the collision model no longer function ([confirm] As in become non-solid?), and the model will not be able to ragdoll anymore.
Hold Animation (HoldAnimation) <boolean> (in all games since Alien Swarm)
If set, the prop will not loop its animation, but hold the last frame.
Animate Every Frame (AnimateEveryFrame) <boolean> (in all games since Portal 2)
Force this prop to animate every frame. Usually this doesn't need to be touched.

GMODSandbox:

Allow Physics Gun (gmod_allowphysgun) <boolean> (only in Garry's Mod)
If set, players cannot use Physics Gun on this entity.
Sandbox Tool Whitelist (gmod_allowtools) <string> (only in Garry's Mod)
If set, only given tools can be used on this entity. You need to supply the tool class names, the names of the .lua files of those tools. This also includes the context menu properties!

BreakableProp:

Explosion Damage (ExplodeDamage) <float>
If non-zero, when this entity breaks it will create an explosion that causes the specified amount of damage. See also Explosion Radius.
Explosion Radius (ExplodeRadius) <float>
If non-zero, when this entity breaks it will create an explosion with a radius of the specified amount. See also Explosion Damage.
Sound to make when punted (puntsound) <sound> (in all games since Half-Life 2: Episode OneHalf-Life 2: Episode One)
Sound to make when punted by gravity gun.
Break Model Message (BreakModelMessage) <string>
"If set, will use this break model message instead of the normal break behavior."
Confirm:Is this new with Source SDK 2013...? It isn't in Alien Swarm or 2007 code but is in 2013. New with L4D?

Breakable (common):

Performance Mode (PerformanceMode) <choices>
Used to limit the amount of gibs produced when this entity breaks, for performance reasons.
  • 0: Normal
  • 1: No Gibs
  • 2: Full Gibs on All Platforms (Xbox 360, PS3, etc)
  • 3: Reduced gibs
Min Damage to Hurt (minhealthdmg) <integer>
If a single hit to the object doesn't do at least this much damage, the prop won't take any of the damage it attempted to give.
Pressure Delay (pressuredelay) <float>
Seconds to delay breaking from pressure. Allows creaking/groaning sounds to play.
Health (health) <integer>
How close to breaking the object is.
Maximum Health (max_health) <integer>
Health cannot exceed this amount.
Physics Impact Damage Scale (physdamagescale) <float>
Multiplier for damage amount when this entity is hit by a physics object. With a value of 0 the entity will take no damage from physics.
Breakable By (BreakableType) <choices> (in all games since Left 4 Dead)
Left 4 Dead Left 4 Dead 2 only. Who can break this?
  • 0: Everyone
  • 1: All Infected
  • 2: Only Tanks

Model:

World Model (model) <string>
The model this entity should appear as. 128-character limit.
Skin (skin or ModelSkin Alien Swarm) <integer>
Some models have multiple skins. This value selects from the index, starting with 0.
Collisions (solid) <choices>
Method of collision for this entity.
Hitbox Set (hitboxset) <string> !FGD
Sets the $hboxset to use.
Body Group (body or SetBodyGroup) <integer> !FGD
Sets the the active $bodygroup.
Model Index (modelindex) <short> !FGD
Given the number index from dumping thecl_precacheinfo modelprecachetable, sets entity model to of the index.
Warning.png Warning: If an entity has animations that will be played, then the set model also must have its own sequences, else the game crashes.
Model Scale (modelscale) <float> (in all games since Half-Life 2: Episode TwoHalf-Life 2: Episode Two) (not in Portal Left 4 Dead Left 4 Dead 2 Source 2013Source 2013) !FGD
A multiplier for the size of the model. Negative values are accepted. Does not alter the physics collisions in most cases, however.
Warning.png Warning: Negative or extremely high values can cause crashes!

Animating

Sequence (sequence) <integer> !FGD
Default animation sequence for the model to be playing after spawning.
Playback Rate (playbackrate) <float> !FGD
A multiplier of the framerate at which animations are played, negative values are accepted. Default is 1.0
Cycle (cycle) <float> !FGD
The current frame of the current animation, on a range from 0-1.
Texture Frame (texframeindex) <integer> !FGD
The initial frame number for all animated textures on this entity.

Effects - Render

Start Fade Distance (fademindist) <float>
Distance at which the entity starts fading. If 0 or less, the entity will disappear instantly when end fade is hit. The value will scale appropriately if the entity is in a 3D Skybox.
End Fade Distance (fademaxdist) <float>
Distance at which the entity ends fading. If 0 or less, the entity won't disappear at all. The value will scale appropriately if the entity is in a 3D Skybox.
Fade Scale (fadescale) <float>
If specified in the worldspawn, or if the engine is running below DirectX 8, entities will fade out even if the fade distances above aren't specified. This value gives more control over when this happens: numbers smaller than 1 cause the entity to fade out at further distances, and greater than 1 cause it to fade out at closer distances. Using 0 turns off the forced fade altogether. See also $noforcedfade.
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.
Render FX (renderfx) <choices>
Preset pattern of appearance effects.


Render Mode (rendermode) <choices>
Set a non-standard rendering mode on this entity.



Effects - Environment

Disable Shadows (disableshadows) <boolean>
Prevent the entity from creating cheap render-to-texture shadows. Does not affect shadow mapping.
Disable Receiving Shadows (disablereceiveshadows) <boolean>
Prevent the entity from receiving shadows on itself.
Shadow Cast Distance (shadowcastdist) <integer>
Sets how far the entity casts dynamic shadows. 0 means default distance from the shadow_control entity.
Lighting Origin (LightingOrigin) <targetname>
Select an entity (notinfo_lightingentity!) from which to sample lighting instead of the entity's origin.
Lighting Origin Offset (LightingOriginHack) <targetname> (not in Left 4 Dead Left 4 Dead 2) !FGD
Theinfo_lighting_relativefrom which to sample lighting instead of the entity's origin.
Disable Flashlight (disableflashlight) <boolean> (in all games since Portal 2)
Used to disable projected texture lighting and shadows on this entity.
Disable ShadowDepth (disableshadowdepth) <boolean> (in all games since Portal 2)
Makes this entity not cast a shadow fromenv_projectedtextureentities.
Projected Texture Cache (shadowdepthnocache) <choices> (in all games since Portal 2)
Used to hint projected texture system whether it is sufficient to cache shadow volume of this entity or to force render it every frame instead.
  • 0: Default
  • 1: No cache - render every frame
  • 2: Cache it - render only once

Miscellaneous

Move Type (MoveType) <choices> (in all games since Alien Swarm) !FGD
Sets a movetype for this entity, which changes its movement behavior.



Collision Group (CollisionGroup) <choices> (in all games since Alien Swarm) !FGD
Sets a collision group for this entity, which changes its collision behavior.



No Animation Sounds (SuppressAnimSounds) <boolean> (in all games since Portal 2) !FGD
Silences sounds linked to animations.

SystemLevelChoice:

Minimum Effect Details Level (mincpulevel) <choices> (in all games since Left 4 Dead)
Maximum Effect Details Level (maxcpulevel) <choices> (in all games since Left 4 Dead)
Don't render for players with Effect Details levels that exceed the minimum or maximum.



Note.png Note: The key's names is because of thecpu_levelcommand; the command Effect Details uses.
Minimum Shader Details Level (mingpulevel) <choices> (in all games since Left 4 Dead)
Maximum Shader Details Level (maxgpulevel) <choices> (in all games since Left 4 Dead)
Don't render for players with Shader Details levels that exceed the minimum or maximum.


Note.png Note: The key's names is because of thegpu_levelcommand; the command Shader Details uses.



Base:

Name (targetname) <string>
The name that other entities use to refer to this entity.
Parent (parentname) <targetname>
Maintain the same initial offset to this entity. An attachment point can also be used if separated by a comma at the end. (parentname [targetname],[attachment])
Tip.png Tip: Entities transition to the next map with their parents
Tip.png Tip: phys_constraintcan be used as a workaround if parenting fails.
Global Entity Name (globalname) <string>
When the player transitions to a new map, entities in the new map with matching globalnames will have their previous map's states copied over to it.
Origin (X Y Z) (origin) <coordinates>
The position of this entity's center in the world. Rotating entities typically rotate around their origin.
Note.png Note: Hammer does not move the entities accordingly only in the editor.
Pitch Yaw Roll (X Y Z) (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.
Note.png Note: This works on brush entities, although Hammer doesn't show the new angles.
Response Contexts (ResponseContext) <string>
Pre-defined response system contexts; Format is [key]:[value],[key]:[value],...and so on.
Tip.png Tip: Can also be filtered for or against!
Classname (classname) <string> !FGD
Determines the characteristics of the entity before it spawns.
Tip.png Tip: Changing classnames using theAddOutputinput can still influence the game's code, like making the classname match one element in the S_PreserveEnts list will make the entity persists on new rounds!
Flags (spawnflags) <integer> !FGD
Toggles exclusive features of an entity, its specific number is determined by the combination of flags added.
Effects (effects) <integer> !FGD
Combination of effect flags to use.
Hammer ID (hammerid) <integer> !FGD
The entity's unique Hammer ID that's auto-generated on map compiles. Mainly used by plugins or debugging commands (like theent_keyvaluecommand). Run-time spawned entities don't have a Hammer ID.
Entity Scripts (vscripts) <scriptlist> (in all games since 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> (in all games since 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. Try to avoid expensive operations in this function, as it may cause performance problems.
Lag Compensation (LagCompensate) <boolean> (in all games since Left 4 Dead 2) !FGD
Set to Yes to lag compensate this entity. Should be used very sparingly!
Disable for Xbox 360 (disableX360) <boolean> (in all games since Left 4 Dead 2) !FGD
If this entity should automatically be given the 'Disable' input on the Xbox 360 version of Source.
Is Automatic-Aim Target (is_autoaim_target) <boolean> (in all games since Counter-Strike: Global Offensive) !FGD
If set to 1, this entity will slow down aiming movement for consoles and joystick controllers when the entity is under the crosshairs.

Flags

DynamicProp:

  •  [64] : Use Hitboxes for Renderbox
  •  [256] : Start with collision disabled

BreakableProp:

  •  [16] : Break on Touch
  •  [32] : Break on Pressure

Inputs

DynamicProp:

SetAnimation <string>
Forces the prop to play the named animation.
SetDefaultAnimation <string>
Changes the animation played when not in a random/forced sequence.
SetPlaybackRate <float>
Sets the framerate at which animations are played.
TurnOff
Hides the prop through EF_NODRAW. The Disable input does the exact same thing.
TurnOn
Shows the prop (by removing EF_NODRAW). The Enable input does the exact same thing.
DisableCollision
Tells the prop to no longer be solid.
EnableCollision
Tells the prop to become solid again.
SetAnimationNoReset <string> (in all games since Alien Swarm)
Force the prop to play an animation unless the prop is already playing the animation. The parameter should be the name of the animation.
FadeAndKill  (in all games since Portal 2)
Fade out then remove this prop.

BreakableProp:

physdamagescale <float>
Sets Physics Impact Damage Scale. 0 means this feature is disabled for backwards compatibility.
EnablePhyscannonPickup
Makes the breakable able to picked up by the gravity gun.
DisablePhyscannonPickup
Makes the breakable not able to picked up by the gravity gun.
EnablePuntSound  (in all games since Half-Life 2: Episode OneHalf-Life 2: Episode One)
Allow this prop from playing its Punt Sound sound when punted by the gravity gun.
DisablePuntSound  (in all games since Half-Life 2: Episode OneHalf-Life 2: Episode One)
Prevent this prop from playing its Punt Sound sound when punted by the gravity gun.

Breakable:

Break
Breaks the breakable.
SetHealth <integer>
Sets a new value for the breakable's health. If the breakable's health reaches zero it will break.
AddHealth <integer>
Adds health to the breakable.
RemoveHealth <integer>
Removes health from the breakable.

Model:

skin <integer>
Selects a skin from the model's index, starting with 0.
SetBodyGroup <integer>
Sets the the active $bodygroup.
Ignite
Makes the entity catch on fire indefinitely.
IgniteLifetime <float>
Makes the entity catch on fire for a given amount of time.
IgniteNumHitboxFires <integer> (removed since Left 4 Dead 2)
Makes the entity catch on fire with a given number of hitbox fire particles. Does not function correctly in Left 4 Dead 2 onward.
IgniteHitboxFireScale <float> (removed since Left 4 Dead 2)
Makes the entity catch on fire with a given scale for hitbox fire particles. Does not function correctly in Left 4 Dead 2 onward.
BecomeRagdoll
Kills the entity and creates a client-side ragdoll from the model. Input is only passed if the model contains $collisionjoints, for other models phys_convert can be used instead.
SetLightingOrigin <targetname>
Sets the entity's lighting origin to use this entity's position.
SetLightingOriginHack <targetname> (removed since Left 4 Dead) <Obsolete>
Deprecated. Offsets the entity's lighting origin by their distance from an info_lighting_relative. Use SetLightingOrigin instead.
fademindist <float>
Sets distance at which the entity starts fading. If <0, the entity will disappear instantly when end fade is hit. The value will scale appropriately if the entity is in a 3D Skybox.
fademaxdist <float>
Sets distance at which the entity ends fading. If <0, the entity won't disappear at all. The value will scale appropriately if the entity is in a 3D Skybox.
SetModelScale <vector> (only in Source 2013Source 2013)
Multiplies the size of the model. Does not alter the physics collisions in most cases. Can take two values separated by a space, in which case the first value would be the target model scale and the second value would be the number of seconds the change in scale will be spread over. If there is no second value, the model will scale instantly.
Tip.png Tip: The modelscale keyvalue can be AddOutputed as a workaround for other games with this input missing.
Warning.png Warning: Negative or extremely high values can cause crashes!
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.
AlternativeSorting <boolean>
Swaps the rendering order of the entity. Used to attempt to fix sorting problems when rendering, for example an object rendering in front of translucent materials.
Color <color255>
Sets an RGB color for the entity.
SetDamageFilter <targetname>
Sets a filter for this entity for when it receives damage.
EnableDamageForces
Allows the entity to be pushed by damage done to it (usually force amount correlates with the damage done).
DisableDamageForces
Prevents the entity from being pushed by damage done to it.
EnableShadow
Allows the entity to draw a render target shadow.
DisableShadow
Prevents the entity from drawing a render target shadow.
EnableDraw  (in all games since Portal 2)
Removes EF_NODRAW from the entity.
DisableDraw  (in all games since Portal 2)
Applies EF_NODRAW to the entity. Note that this is different than rendermode 10.
EnableReceivingFlashlight  (in all games since Portal 2)
Makes it so that the entity is lit by env_projectedtextures.
DisableReceivingFlashlight  (in all games since Portal 2)
Prevents the entity from being lit by env_projectedtextures. The shadow made by the texture will still cast.
EnableDrawInFastReflection  (in all games since Portal 2)
Makes the entity be rendered in reflections from water materials using $reflectonlymarkedentities.
DisableDrawInFastReflection  (in all games since Portal 2)
Prevents the entity from rendering in fast reflections.


Base:

AddContext <string>
Adds to the entity's list of response contexts. Format is <key>:<value>.
AddOutput <string>
Assigns a new keyvalue/output on this entity. For keyvalues, some rely on extra necessary code to be ran and won't work if its simply just changed through this input. There is a strict format that must be followed:
Syntax: 


ClearContext
Removes all contexts from this entity's list.
ClearParent
Removes this entity from the the movement hierarchy, leaving it free to move independently.
FireUser1 to FireUser4
Fires the respectiveOnUseroutputs; see User Inputs and Outputs.
Kill
Removes this entity and any entities parented to it from the world.
KillHierarchy
Functions the same as Kill, although this entity and any entities parented to it are killed on the same frame, being marginally faster thanKillinput.
RemoveContext <string>
Remove a context from this entity's list. The name should match the key of an existing context.
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.
Use  !FGD
Same as a player invoking +use; no effect in most cases.
DispatchResponse <string> !FGD
Dispatches a response to the entity. See Response and Concept.
DispatchEffect <string> (removed since Left 4 Dead) !FGD
Dispatches a special effect from the entity's origin; see also List of Client Effects. Replaced by the particle system since Left 4 Dead.
RunScriptFile <script> (in all games since 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> (in all games since 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.png Bug: In Hammer, using string arguments will corrupt the VMF file's structure, making the file unviewable for the next Hammer session.
Fix: Remove the string argument manually with a text editor.
CallScriptFunction <string> (in all games since Left 4 Dead 2) !FGD
Execute a VScript function in the scope of the receiving entity.
SetLocalOrigin <coordinates> (in all games since 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> (in all games since Alien Swarm) !FGD
Set this entity's angles.


Outputs

DynamicProp:

OnAnimationBegun
Fired when an animation begins.
OnAnimationDone
Fired when an animation finishes.

Breakable (prop):

OnTakeDamage
Fired when damage is taken.
OnPhysCannonAnimatePreStarted
Fired when prop starts its ACT_PHYSCANNON_ANIMATE_PRE activity. Caused by the object being picked up by the gravity gun.
OnPhysCannonAnimatePullStarted
Fired when prop has started its ACT_PHYSCANNON_ANIMATE activity. ACT_PHYSCANNON_ANIMATE_PRE plays once, then ACT_PHYSCANNON_ANIMATE starts looping.
OnPhysCannonDetach
Fired when prop has started its ACT_PHYSCANNON_DETACH activity (caused by the gravity gun ripping it from a wall).
OnPhysCannonAnimatePostStarted
Fired when prop has started its ACT_PHYSCANNON_ANIMATE_POST activity (caused by the player letting the prop go from the gravity gun).
OnPhysCannonPullAnimFinished
Fired when prop has finished all gravity gun-related animations.

Breakable (common):

OnBreak
Fired when this object breaks. !activator is whatever breaks the object.
OnHealthChanged <float>
Fired whenever the health of the breakable has increased or decreased. This output automatically puts the new health amount as a decimal percent (e.g. 45% = 0.45) into the parameter box for inputs, if the mapper does not override the parameter with something else.

Model:

OnIgnite
Fired when the entity catches fire, such as from an env_entity_igniter or the Ignite inputs.
OnFizzled  (in all games since Portal 2)
Fired when this entity is fizzled by a fizzler or any other means. (Except the Dissolve input. Use SilentDissolve instead.)

Base:

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 Left 4 Dead Left 4 Dead 2)
This output fires when the entity is killed and removed from the game.

See also