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prop_physics

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class hierarchy
CPhysicsProp defined in props.cpp
CBreakableProp
CBaseProp
CBaseAnimating
CBaseEntity

prop_physics is a point entity available in all Source Source games. It is used to add rigid, VPhysics-simulated models to the world.

The only value required for prop_physics to work is a path to a model. As long as that model is physics-enabled, the correct data will be loaded from it when the map starts. It is possible to change any embedded physics data with the "Override Parameters" keyvalue.

Physics objects like prop_physics can be parented, though it is not in the default FGD and may not function correctly. It is recommended to instead use dynamic physics constraints. See Physics Entity Overview for more information.

Tip.pngTip:Multiplayer maps should use prop_physics_multiplayer, which works better with the collision prediction code.
Do not use prop_physics_respawnable; it will crash the server if destroyed by a trigger_hurt.
Tip.pngTip:To create a jointed physics object, use prop_ragdoll.
AltNames.pngAltNames: This entity is also tied to physics_prop. The classname is always changed to prop_physics on spawn.

Consistency

Blank image.pngTodo: Move this section to its own article.

Consistency becomes a large problem when dealing with the many prop models that the Source engine provides. From a player's perspective, object interactivity should remain consistent across all the levels of your game / mod, as players will often have a hard time solving puzzles or making quick decisions if the prop's behaviour is different in only one specific instance. To enforce this, the game-related data of props is stored within the model itself.

For example, imagine you have a crate that is immovable for the entirety of your game and the player has gotten used to that crate being static. However, in one specific instance, this crate is not moveable and required to be moved to proceed. This can cause lots of irritation and confusion, and therefore is why consistency is necessary. Oftentimes, developers will use different skins or models to convey differences in behaviour and keep consistency.

Models that are meant to be physically simulated (chairs, tables, wooden planks, etc) will remove themselves if they are placed as prop_static or prop_dynamic entities (You can still use these as static props using the entity prop_dynamic_override). Other game-related data, such as mass, "health", gib amount & models, and so on are all stored inside the prop model as well.

The method by which they are stored, and guidelines for how to set it up, can be found in the Prop Data section of the model's QC file.

Keyvalues

Targetname:

Name (targetname) <string>
The targetname that other entities refer to this entity by.

BasePropPhysics:
Physics Impact Damage Scale (physdamagescale) <float>
Multiplies damage received from physics impacts. 0 means the feature is disabled for backwards compatibility.
Impact damage type (Damagetype) <boolean>
If true (1), damage type is sharp and the object can slice others.
Damaging it Doesn't Push It (nodamageforces) <boolean>
Whether damaging the entity applies force to it.
Scale Factor For Inertia (inertiascale) <float>
Scales the angular mass of an object. Used to hack angular damage and collision response.
Confirm:Doesn't actually affect inertia?
Mass Scale (massscale) <float>
Multiplier for the object's mass.
Override Parameters (overridescript) <string>
A list of physics keyvalues that are usually embedded in the model. Format is key,value,key,value,….
Health Level to Override Motion (damagetoenablemotion) <integer>
If specified, this object will start with motion disabled. Once its health has dropped below this specified amount, it will enable motion.
Physics Impact Force to Override Motion (forcetoenablemotion) <float>
If specified, this object will start motion disabled. Any impact that imparts a force greater than this value will enable motion.

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!

BaseAnimating:
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.
Choices
  • 0: None
  • 1: BSP (QPhysics) !FGD
    Icon-Bug.pngBug:In Portal 2 Portal 2, if an entity using QPhysics collisions is hit by Gel, the game will crash!
  • 2: Bounding Box
  • 3: Oriented Bounding Box (Use for runtime spawned rotated brush entities) !FGD
  • 4: Oriented Bounding Box, constrained to Yaw only !FGD
  • 5: Custom/Test (Usually no collision with anything) !FGD
  • 6: VPhysics
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 the cl_precacheinfo modelprecache table, sets entity model to the index.
Warning.pngWarning: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 Two)
A multiplier for the size of the model. Negative values are accepted. Does not alter the physics collisions in most cases, however.
Warning.pngWarning:Negative or extremely high values can cause crashes!
Note.pngNote:Scale may not appear in Hammer Hammer 4.x, but will appear in-game (tested in Day of Defeat: Source). This is fixed in Hammer++ Hammer++.

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.
FX Amount/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>
Various somewhat legacy alpha effects.
Render Effects
Icon-Bug.pngBug:Alpha effects from 0 to 10 are unavailable due to the bug in code in Counter-Strike: Global Offensive Counter-Strike: Global Offensive
  • 0: None
  • 1: Slow Pulse (varies alpha by ±16 over a period of 1.5 s)
  • 2: Fast Pulse (varies alpha by ±16 over a period of 0.4 s)
  • 3: Slow Wide Pulse (varies alpha by ±64 over a period of 1.5 s)
  • 4: Fast Wide Pulse (varies alpha by ±64 over a period of 0.4 s)
  • 5: Slow Fade Away (decreases alpha by -1 per frame/(in all games since Left 4 Dead) Fades out over 4 s)
  • 6: Fast Fade Away (decreases alpha by -4 per frame/(in all games since Left 4 Dead) Fades out over 1 s)
  • 7: Slow Become Solid (increases alpha by +1 per frame/(in all games since Left 4 Dead) Fades in over 4 s)
  • 8: Fast Become Solid (increases alpha by +4 per frame/(in all games since Left 4 Dead) Fades in over 1 s)
  • 9: Slow Strobe (transparent 0.8 s, visible 0.8 s, repeat)
  • 10: Fast Strobe (transparent 0.2 s, visible 0.2 s, repeat)
  • 11: Faster Strobe (transparent 0.09 s, visible 0.09 s, repeat)
  • 12: Slow Flicker (transparent 0.18 s, visible 1.5 s, repeat)
  • 13: Fast Flicker (transparent 0.14 s, visible 0.2 s, repeat)
  • 14: Constant Glow ("NoDissipation;" purpose uncertain—for sprites?) (not in Counter-Strike: Global Offensive)
  • 15: Distort (causes unnatural flickering and position shifting)/(in all games since Left 4 Dead) Fade Out (instant; not very useful outside of code)
  • 16: Hologram (Distort + "distance fade")/(in all games since Left 4 Dead) Fade In (instant; not very useful outside of code)
  • 17: Scale Up ("Explode"/"scale up really big!" causes wild stretching of model parts) (in Source 2013)/Fade Wider Pulse (varies alpha by ±255 over a period over a period of 0.26 s) (in all games since Left 4 Dead)
    Confirm:which branches/games is it available in, and where does it do what?
  • 18: Glow Shell (purpose unclear) (in all games since Source 2013) (not in Counter-Strike: Global Offensive)
    Confirm:what does this do? and which games is it in?
  • 19: Clamp Minimum Scale ("keep this sprite from getting very small (SPRITES only!)") (not in Counter-Strike: Global Offensive)
  • 20: Environmental Rain ("for environmental rendermode, make rain") (in Source 2013) (not in Counter-Strike: Global Offensive)
    Confirm:which games? may be nonfunctional.
  • 21: Environmental Snow ("for environmental rendermode, make snow") (in Source 2013) (not in Counter-Strike: Global Offensive)
    Confirm:which games? may be nonfunctional.
  • 22: Spotlight FX ("TEST CODE for experimental spotlight") (in Source 2013) (not in Counter-Strike: Global Offensive)
  • 23: Ragdoll ("HACKHACK: TEST CODE for signalling death of a ragdoll character;" ragdolls an entity but doesn't kill it) (in Source 2013) (not in Counter-Strike: Global Offensive)
    Confirm:which games? may be nonfunctional?
  • 24: Fade Wider Pulse (varies alpha by ±255 over a period over a period of 0.26 s) (in Source 2013) (not in Counter-Strike: Global Offensive)
  • 25: kRenderFXMax/Fade Near (removed since Left 4 Dead) (not in Counter-Strike: Global Offensive)
Blank image.pngTodo: what does this do? may be nonfunctional
Render Mode (rendermode) <choices>
Set a non-standard rendering mode on this entity.
Render Modes
  • 0: Normal
  • 1: Color
  • 2: Texture
  • 3: Glow
  • 4: Solid/Alphatest Obsolete
  • 5: Additive
  • 6: Removed, does nothing Obsolete
  • 7: Additive Fractional Frame
  • 8: Alpha Add
  • 9: World Space Glow
  • 10: Don't Render

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 (not info_lighting!) from which to sample lighting instead of the entity's origin.
Lighting Origin Offset (LightingOriginHack) <targetname> (not in Left 4 Dead series) !FGD Obsolete
Deprecated. The info_lighting_relative from which to sample lighting instead of the entity's origin. Use Lighting Origin instead.
Disable Flashlight (disableflashlight) <boolean> (in all games since Portal 2)
Used to disable projected texture lighting and shadows on this entity. Identical to EF_NOFLASHLIGHT.
Disable ShadowDepth (disableshadowdepth) <boolean> (in all games since Portal 2)
Makes this entity not cast a shadow from env_projectedtexture entities. Identical to EF_NOSHADOWDEPTH.
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. Identical toEF_SHADOWDEPTH_NOCACHE.
  • 0: Default
  • 1: No cache—render every frame
  • 2: Cache it—render only once

Miscellaneous

Glow Backface Multiple (glowbackfacemult) <float> (only in Left 4 Dead 2) !FGD
If this object has a glow effect, multiply the effect by this much on the sides of the object that are facing away from the viewer.
Move Type (MoveType) <choices> (in all games since Alien Swarm) !FGD
Sets a movetype for this entity, which changes its movement behavior.
Move Types
  • 0: None, don't move
  • 1: Isometric
  • 2: Walk, player only, moving on ground
  • 3: NPC, movement
  • 4: Fly, no gravity
  • 5: Fly, with gravity
  • 6: Physics
  • 7: Push
  • 8: Noclip
  • 9: Ladder, for players on ladders
  • 10: Spectator
  • 11: Custom
Collision Group (CollisionGroup) <choices> (in all games since Alien Swarm) !FGD
Sets a collision group for this entity, which changes its collision behavior.
Groups
  • 0: None
  • 1: Debris, collides only with the world and static props
  • 2: Debris, with trigger interaction
  • 3: Interactive Debris, doesn't collide with other debris
  • 4: Interactive, collides with everything except debris
  • 5: Player
  • 6: Breakable Glass
  • 7: Vehicle
  • 8: Player Movement
  • 9: In-Vehicle
  • 10: Weapon
  • 11: Vehicle Clip
  • 12: Projectile
  • 13: Door blocker, not permitted to go near doors
  • 14: Passable Door
  • 15: Dissolving
  • 16: Pushaway
  • 17: NPC Actor, NPCs ignore the player
  • 18: NPC Scripted, NPCs do not collide with each other
No Animation Sounds (SuppressAnimSounds) <boolean> (in all games since Portal 2) !FGD
Silences sounds linked to animations.DXLevelChoice:
Minimum / Maximum DX Level (mindxlevel / maxdxlevel) <choices> (removed since Left 4 Dead)
The entity will not exist if the engine is running outside the given range of DirectX Versions.
Choices
Warning.pngWarning:If these are used, the object may break when the user switches their DirectX settings.
SystemLevelChoice:
Minimum / Maximum Effect Details Level (mincpulevel / 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.pngKey names are related to cpu_level cvar used by Effect Details.]
Choices
  • 0: Default ("Low" formincpulevel, "High" formaxcpulevel)
  • 1: Low
  • 2: Medium
  • 3: High
Minimum / Maximum Shader Details Level (mingpulevel / 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.pngKey names are related to gpu_level cvar used by Shader Details.]
Choices
  • 0: Default ("Low" formingpulevel, "Very High" formaxgpulevel)
  • 1: Low
  • 2: Medium
  • 3: High
  • 4: Very High

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 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> (only in Left 4 Dead series)
Who can break this?
  • 0: Everyone
  • 1: All Infected
  • 2: Only Tanks
Breakable by (BreakableType) <choices> (only in Left 4 Dead series)
  • 0: "Everyone"
  • 1: "All Infected"
  • 2: "Only Tanks"

Flags

BasePropPhysics:

  •  [2] : Don't take physics damage
  •  [4] : Debris
       Don't collide with the player or other debris.
  •  [8] : Motion Disabled
       Starts with motion disabled until sent EnableMotion.
  •  [64] : Enable motion when grabbed by gravity gun
  •  [256] : Generate output on +use
  •  [512] : Prevent pickup
  •  [1024] : Prevent motion enable on player bump.
  •  [2048] : Has Attached Ragdolls !FGD
       Set by the game when ragdolls are attached, destroys them when prop moves
  •  [4096] : Debris with trigger interaction.
  •  [16384] : Radius Pickup !FGD
       Makes objects easier to grab
  •  [1048576] : Gravity gun can ALWAYS pick up. No matter what.
  •  [2097152] : No Collisions !FGD
       Disable collisions on spawn
  •  [4194304] : Gib !FGD
       If debris, remove when stuck in a collision

BreakableProp:

  •  [16] : Break on Touch
  •  [32] : Break on Pressure
Icon-Bug.pngBug:In Left 4 Dead 2 when breakable prop has Force server-side flag set then nav areas under it will be marked MOB_ONLY
  •  [4194304] : Attempt to override gib with the character gib system (only in Black Mesa)

Inputs

Ignite
Ignite, burst into flames.
IgniteLifetime <float>
Ignite with the given lifetime.
Blank image.pngTodo: Before the flames extinguish, or before health reaches zero?
IgniteNumHitboxFires <integer>
Ignite with the given number of hitbox fires.
IgniteHitboxFireScale <float>
Ignite with the given hitbox fire scale.

BasePropPhysics:

Sleep
Tell the prop to quit moving. Any physics forces (excluding gravity and water buoyancy) will cause the object to resume moving as usual. Sleeping also occurs automatically when the object has no physics forces to keep it awake, and when it is no longer moving a noticeable amount.
Wake
If the object was told to sleep, tell it to start moving again.
DisableMotion
Tell the object to stop moving completely. No physics forces will re-enable motion, not even Wake.
EnableMotion
If the object's motion has been disabled entirely, tell it to resume movement as usual. This will also Wake the object, if it is Sleeping.
DisableFloating
If the object would normally float when in water, tell it not to float. There seems to be no way to re-enable floating behavior, but programming a method to do this should be fairly simple (CALLBACK_DO_FLUID_SIMULATION).

BreakableProp:

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.
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 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 One)
Prevent this prop from playing its Punt Sound sound when punted by the gravity gun.

Outputs


BasePropPhysics:
OnMotionEnabled
Fired when motion has been enabled on the prop, either via the Health Level to Override Motion keyvalue or from the EnableMotion input.
OnAwakened
Fired when the prop has woken (force has been applied to it while it was asleep, or the Wake input has been called).
OnOutOfWorld
Fired whenever the object is detected to be outside the world. Specifically, it checks if the object is outside of the world's bounding box or if the object is traveling at over 2000 units per second in any cardinal direction.
OnPlayerUse
Fired when the player has +used the prop.
Note.pngNote:This output (but not any of the other pickup-related ones) will fire only if the Generate output on +USE spawnflag is set.
OnPhysGunDrop
Fired when the player has dropped the prop (from either +use or the gravity gun). !activator is the player.
OnPlayerPickup
Fired when the player has picked the prop up with +use or the gravity gun (in Half-Life 2).

BreakableProp:

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.
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.
OnPhysGunOnlyPickup
Fired when the player has picked the prop up with the gravity gun specifically.
OnHitByTank  (in all games since Left 4 Dead 2)
Fired when the prop has been punched by a Tank boss infected.Model:
OnIgnite  !FGD
Fired when the entity catches fire, such as from an env_entity_igniter or the Ignite inputs.
OnFizzled  (only in Portal 2)
Fired when this entity is fizzled by a trigger_portal_cleanser or, for prop_weighted_cube, the Dissolve or SilentDissolve inputs.
Icon-Bug.pngBug:It does not fire when the object is fizzled by other means such as env_entity_dissolver.

See also