Func precipitation

Rain particles created by func_precipitation in Counter-Strike: Global Offensive

func_precipitation is a brush entity available in all Source games. It creates rain, snow, or ash inside its volume.

Class hierarchy
CPrecipitation ↳CBaseEntity
effects.cpp

Important:This is a preserved entity in .
If the game has round restart mechanics this entity may not behave as expected:

More info

On a new round entities with this classname will intentionally not reset. You can use logic_auto to emulate resetting it. Killing it removes it forever, as it is not respawned on a new round. It cannot be spawned with a point_template. Parenting this with non-preserved entities may have undesirable effects.

Keyvalues

Name (targetname) <string>[ Edit ]

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

Density (0-100%) (renderamt) <integer>

This is the amount of particles that fall down from the top side of the brush. However, distance from first particle to second depends on a brush volume size!

Color (R G B) (rendercolor) <color255>

Color added to sprites which are rendered transparently (probably rain and snow particles)

Precipitation Type (preciptype) <choices>

Precipitation type

Type	Availability	Description
Rain		Seen in CS:S map "de_aztec"
Snow		Identical to Rain, use "Snowfall" instead.
Ash		Seen throughout Half-Life 2: Episode One Note:Appears with missing textures in most games. You may copy all materials/effects/fleck_ash* and materials/effects/ember_swirling001 files from ep1_pak_dir.vpk and ship it with your game/map.
Snowfall		Seen in DoD:S map "dod_colmar"
Particle Rain	(in all games since )	Seen in Left 4 Dead's "No Mercy" campaign, CS:GO map "de_aztec" Particle rain with slight mist and refraction.
Particle Ash	(in all games since )	Seen in in Left 4 Dead's "Dead Air" campaign.
Particle Rain Storm	(in all games since )	Seen in Left 4 Dead 2's "Hard Rain" and "The Passing" campaigns. Particle rain with no mist/refraction and more angled particles. Alpha values over 100 enable an additional flying leaves effect seen during the storm event.
Particle Snow	(in all games since )	Seen in CS:GO map "ar_monastery"
Particle Bugs	(only in )	Seen in Left 4 Dead 2's "Swamp Fever" campaign. Particle flying bugs. In later games, this value is used by Particle Snow instead.
Particle Smoke	(only in )	Seen in Left 4 Dead 2's "Dead Center" campaign. Particle smoke with variable density.

Note:The "Particle" precipitation types are generated using the PCF files of a game, allowing users to alter the look of the precipitation in more ways than just the used material.

Inputs

Alpha <integerRedirectInput/integer> !FGD

Changes the density of the rain, and may add additional particle effects like fog or leafs. It accepts inputs from -1 to 255.

Related Console Commands

There are a number of console commands that control precipitation rendering. See the Precipitation issues page for details on various issues and workarounds involving this entity.

Command Name	Value	Description
r_RainParticleDensity	<float>	Set the density to enable or disable any precipitation particle. Value 1 to enable and 0 to disable.
r_rainalpha	<float>	Adjusts transparency of rain particles.
r_rainProfile	<bool>	Displays stats on rain rendering costs.
r_RainHack	<bool>	Overrides density values set in Hammer. Enabling will result in longer and more dense rain than at 100%. Can help solve visibility issues. Note:Rain may fall through brushes when this command is enabled.
r_rainspeed	<float>	Lower values will cause rain to disappear sooner and fall slower. Default value is 600.0f
r_RainSideVel	<float>	Controls sideways movement of the rain particles.
r_RainSimulate	<bool>	Toggles animation on the rain; freezes the rain when set to 0.
r_rainwidth	<float>	Widens the rain's alpha to desired value. Default value is 0.5
r_RainRadius	<float>	Distance from the brush where the rain starts/stops rendering.
r_rainlength	<float>	Changes the length of the rain particles. Default value is 0.1f
r_RainSplashPercentage	<float>	Percent chance of splash particles spawning when a particle is used.
r_raindensity	<float>	No function. Use r_RainParticleDensity instead.
r_rainalphapow	<float>	Raises the value of r_rainalpha exponentially. Confirm:Some say this has no effect?

Warning:func_precipitation brushes should not overlap func_smokevolume brushes, as it can freeze the game. The exact cause of this is not clear.

Note:The precipitation created by this entity is not gpu-accelerated. In resource-intensive multiplayer games such as , it's recommended to use a particle system to create weather effects rather than relying on this entity.

See also

• func_precipitation_blocker