//lame example weather particles by Spike
//move to id1/particles/weather.cfg
//
//to use from qc, r_particledesc "weather classic" or call particleeffecnum("weather.te_rain") so the engine knows which config to use, then use the particle[rain|snow] builtins as normal.
//without qc changes option 1) use a texture called skyrain or skysnow, in addition to the r_particledesc thing so that this config is actually used (this is more for people to add stuff to existing maps).
//without qc changes option 2) add a worldspawn field called "_texpart_TEXTURENAME" with value "weather.tex_skysnow" or "weather.tex_skyrain"
//without qc changes option 3) an equivelent console command: r_partredirect tex_TEXTURENAME "weather.tex_skysnow"
//note that without qc, you need to restart the map for it to take effect.
//on the other hand, if you wanted to emit particles from models, use r_effect (which can optionally hide those models too).
//to override trails defined by model flags, you can use the r_trail command.
//weather effects that leave decals are probably overkill
//one option is to spawn a particle from qc that emits other particles that leave trails. emitting such trail emitting emitters from surfaces is definitely overkill.

//generic rain for the qc builtin
//create another called te_rain_12 or whatever for alternative versions of rain (going by the specified palette)
r_part te_rain
{
	texture ball
	scalefactor 1
	count 1
	alpha 0.4
	rgb 255 255 255
	die 2
	veladd 2
	scale 2
	stretchfactor -40
	type texturedspark
	cliptype weather.rainsplash
	clipbounce 100
	clipcount 5
}

//internal splash effect for rain
r_part weather.rainsplash
{
	randomvel 50 50
	count 1
	texture ball
	scalefactor 1
	alpha 0.1
	rgb 255 255 255
	die 0.4
	scale 50
	stretchfactor -2.5
	veladd 1
	scale 1
	type texturedspark
	gravity 800
}

//generic snow for the qc builtin
//naming itself causes it to bounce
r_part te_snow
{
	texture ball
	scalefactor 1
	count 1
	alpha 1
	rgb 255 255 255
	die 2
	veladd 1
	scale 5
	flurry 40
	gravity 400
	friction 5

	//settle
	clipbounce 0
}

//rain effect to be emitted from textures
//the base direction points away from the surface, so veladd is the speed to move away from said surface.
//this isn't very useful for rain, because that vector is quite often horizontal (where the sky surrounds the player)
//that said, sitting in a box of such rain surfaces gives an interesting laser-field effect...
//anyway, that's why we can't reuse the qc effects, because qc gives a velocity that is actually meant to be usable.
r_part tex_skyrain
{
	texture ball
	scalefactor 1
	rainfrequency 10
	count 1
	alpha 0.1
	rgb 255 255 255
	die 2
	veladd 2000
	velbias 0 0 0
	scale 1
	stretchfactor -40
	type texturedspark
	cliptype weather.rainsplash
	clipbounce 100
	clipcount 5
}

//snow from sky surfaces is often within a box
//this means we don't want the snow to ever settle.
//we also have no volume, so make the snow fall a little further.
r_part tex_skysnow
{
	texture ball
	scalefactor 1
	rainfrequency 2
	count 1
	alpha 1
	rgb 255 255 255
	die 8
	veladd 1000
	scale 5
	flurry 40
	gravity 400
	friction 5

	cliptype tex_skysnow
	clipbounce 0
}