Physics cannister

physics_cannister is an e0 available in all Source games. It is a physically simulated gas canister (with a misspelled entity name) that can have its cap shot off, at which point gas will start escaping, causing the canister to fly around. If it takes enough damage, it will explode.

A fire extinguisher turned into a physics_cannister by adding a nozzle attachment to the top. Thrust will be applied along the blue line.

A gif of a physics cannister (in an official Half-Life 2 map) having its cap shot off and flying into a wall, then it being shot again causing it to explode.

Note:The model should have a nozzle attachment point, which is where gas will escape and thrust will be produced from.
The thrust will be simulated along the Z axis, visualized as the blue line of the attachment in HLMV.

In code, it is represented by theCPhysicsCannisterclass, defined in thephysics_cannister.cppfile.

Keyvalues

Explosion Damage ([todo internal name (i)]) <string>

The amount of damage done by the explosion created when the canister blows up.

Explosion Radius ([todo internal name (i)]) <string>

The radius of the explosion to create when the canister blows up.

Health ([todo internal name (i)]) <integer>

The amount of damage the canister takes before exploding.

Thrust ([todo internal name (i)]) <string>

When the cap has been blown off, and the escaping gas is thrusting the canister about, this is the amount of thrust generated.

Fuel Seconds ([todo internal name (i)]) <string>

The amount of time that gas leaks from the canister before being considered empty.

Smoke Color (R G B) ([todo internal name (i)]) <color255>

Color of the smoke.

Smoke Alpha (0 - 255) ([todo internal name (i)]) <integer 0–255>

Transparency of the smoke.

Thruster Sound ([todo internal name (i)]) <sound>

The sound played when the gas is escaping from the canister.

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Flags

Start Asleep : [1]

Explode : [2]

Debris : [4] !FGD

Don't collide with the player or other debris.

Motion Disabled : [8] !FGD

Starts with motion disabled until sent EnableMotion.

Enable motion when grabbed by gravity gun : [64] !FGD

Not affected by rotor wash : [128] !FGD

Generate output on +use : [256] !FGD

Prevent pickup : [512] !FGD

Prevent motion enable on player bump. : [1024] !FGD

Debris with trigger interaction. : [4096] !FGD

Force server-side : [8192] !FGD

Multiplayer only; see sv_pushaway_clientside_size.

Gravity gun can ALWAYS pick up. No matter what. : [1048576] !FGD

BreakableProp:

Break on Touch : [16]

Break on Pressure : [32]

Will break after being stood on for PressureDelay seconds.

Note:Some models will break instantly if this is or isn't set. (e.g. militiawindow02_breakable.mdl, window_industrial.mdl)

Inputs

Activate <stringRedirectInput/string>

Start gas escaping from the canister.

Deactivate <stringRedirectInput/string>

Stop gas escaping from the canister.

Explode <stringRedirectInput/string>

Force the canister to explode.

Wake

Wakes up the canister, if it is sleeping.

Note:Content moved to Rendering and studio model related KIO/Inputs for continuation of page history

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Outputs

OnActivate

Fired when gas starts to escape from the canister.

Note:Page left for viewable history, content moved to prop_physics