env_poison_gas

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The four types of gas, antigen is invisible due to a bug.

env_poison_gas is a point entity available in SiN Episodes. It spawns a cloud of gas from a selection of different gas types within its radius of effect, which are only ever used actively once in se1_u4lab01 (U4 Lab - Infiltration) to teach the player of the U4 gas and passively in the background maps as decoration. The U4 gas is also used by the prop_mutagen_barrel entity and antigen by all of the health objects in the game like the prop_antigen_canister. The entity is able to produce four different types of gas:

• U4 is known for its green colour, slows down the world from the player's POV and begins to hurt once the affect bar is full.
• Antigen is normally blue and heals the player over time.
• Radiation is an unused orange gas and damages on a constant rate like if being cut.
• Inert has no effects of any kind and should only ever be used for decoration purposes.

Warning: Be careful with the amount of particles and their spawnrate, as they can decrease performance in heavily detailed scenes

Note: By letting the entity spawn with an infinite duration and then changing it while active, makes the sound stop correctly once the duration is up.

Tip: Please consider using an ambient_generic entity for the sound if it shall ever need to be turned off (ambient/gas/gas_poison_loop2.wav).

Keyvalues

Name (targetname) <string>

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

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

Gas cloud active on spawn (1: Yes, 0: No).

Damage ([todo internal name (i)]) <float>

Damage per second (DPS) inflicted by this poison.

Bug: Does not seem to have any effect. U4 and Radiation always deals and antigen always heals about 3 DPS no matter what.  [todo tested in?]

Radius ([todo internal name (i)]) <float>

Poison gas radius.

Duration ([todo internal name (i)]) <float>

Duration in seconds (0: Infinite).

Bug: If the duration is non-infinite the sound effects will be muted on activation.  [todo tested in?]

Spawnrate ([todo internal name (i)]) <float>

Particle Spawn Rate.

Gas Type ([todo internal name (i)]) <choices>

Type of gas.

• 0: U4
• 1: Antigen
• 2: Radiation
• 3: Inert

Bug: The antigen gas type is invisible but else works as expected. An env_steam or func_smokevolume can be used to fake its gas cloud, RGB colour: (0 65 100).  [todo tested in?]

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.

Inputs

TurnOn

Turn Gas On.

TurnOff

Turn Gas Off.

Bug: Turning off the cloud does not disable the sound effects.  [todo tested in?]

SetRadius <float>

Set Gas cloud radius

SetDuration <float>

Set Gas cloud duration (0: Infinite).

Bug: If the duration is non-infinite the sound effects will be muted on activation.  [todo tested in?]

SetSpawnRate <float>

Set Gas particle spawn rate.

Note: The entity needs to be turned off and on again for any effects to occur.

Sound <boolean>

Turn gas cloud sound on or off.

Bug: Does not seem to have any effect.  [todo tested in?]

SetStartColor <vector>

Set the color of the gas at start.

SetEndColor <vector>

Set the color of the gas at end.

Bug: Does not seem to have any effect.  [todo tested in?]

Ouputs

OnUse

Fires when the Use input is given.