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 (???) <string>

The targetname that other entities refer to this entity by.

Active (???) <integer>

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

Damage (???) <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.

Radius (???) <float>

Poison gas radius.

Duration (???) <float>

Duration in seconds (0: Infinite).

Bug:If the duration is non-infinite the sound effects will be muted on activation.

Spawnrate (???) <float>

Particle Spawn Rate.

Gas Type (???) <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).

Angles:

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.

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.

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.

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.

Targetname:

AddOutput <string>

Evaluates a keyvalue/output on this entity.
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.

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 than Kill.

Ouputs

Targetname:

OnUse

Fires when the Use input is given.

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.