https://www.youtube.com/watch?v=Z4qqy3PAB30

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1.-Open your map in the radiant and add trigger_multiple where you want the sound to be inside.

Add these kvps:

targetname	inside_rain

2.-Open your zombie_mapname.gsc and below

//#include maps\zombie_theater_teleporter;

add this:

#include maps\_weather;

under of:

main ()
{

add this:

level._effect["lightning_strike"] = LoadFX( "maps/zombie/fx_zombie_lightning_flash" );
	level._effect["rain_10"]   = LoadFX( "env/weather/fx_rain_sys_heavy" );
	level._effect["rain_9"]  = LoadFX( "env/weather/fx_rain_sys_heavy" );
	level._effect["rain_8"]  = LoadFX( "env/weather/fx_rain_sys_heavy" );
	level._effect["rain_7"]  = LoadFX( "env/weather/fx_rain_sys_heavy" );
	level._effect["rain_6"]  = LoadFX( "env/weather/fx_rain_sys_med" );
	level._effect["rain_5"]  = LoadFX( "env/weather/fx_rain_sys_med" );
	level._effect["rain_4"]  = LoadFX( "env/weather/fx_rain_sys_med" );
	level._effect["rain_3"]  = LoadFX( "env/weather/fx_rain_sys_med" );
	level._effect["rain_2"]  = LoadFX( "env/weather/fx_rain_sys_lght" );
	level._effect["rain_1"]  = LoadFX( "env/weather/fx_rain_sys_lght" );
	level._effect["rain_0"]  = LoadFX( "env/weather/fx_rain_sys_lght" );

you have to look for this line:

maps\_zombiemode::main();

under it add this:

thread weather_control();

at the end of the .gsc add this:

weather_control()
{
	flag_wait("all_players_connected");

	rainInit( "hard" ); // get rain going
   	level thread rainEffectChange( 9, 0.1 );  // tweak initial rain strength ... default is hard
   	thread playerWeather(); // make the actual rain effect generate around the players

	level.thunder_sound_active = true; //disable or enable thunder sounds

	players = get_players();
	for(i = 0; i < players.size; i++)
	{
		players[i] thread watchRainSFX();
	}

   	level.nextLightning = GetTime() + 1;
   	thread lightning( ::lightning_normal, ::lightning_flash );
}

watchRainSFX()
{
	self endon("death");
	self endon("disconnect");
	
	self.isInside = false;
	self.isInsideLoop = false;
	self.isOutsideLoop = false;

	zones = GetEntArray("inside_rain", "targetname");

	while(1)
	{
		for(i = 0; i < zones.size; i++)
		{
			if(self IsTouching(zones[i]))
			{
				self.isInside = true;
				break;
			}
			else
			{
				self.isInside = false;
			}
		}
		
		if(self.isInside)
		{
			if(!self.isInsideLoop)
			{
				iprintln("Jugador isInSide");
				self.isInsideLoop = true;
				self.isOutsideLoop = false;
				self StopLoopSound();
				self PlayLoopSound("rain_inside");
			}
		}
		else
		{
			if(!self.isOutsideLoop)
			{
				iprintln("Jugador isOutSide");
				self.isOutsideLoop = true;
				self.isInsideLoop = false;
				self StopLoopSound();
				self PlayLoopSound("rain_outside");
			}
		}
		wait(0.1);
	}
}

lightning_normal()
{
	wait( 0.05 );
	ResetSunLight();
}

lightning_flash()
{
	SetSunLight( 4, 4, 4.5 );
	SetSunLight( 1, 1, 1.5 );
	
	wait( 0.0014 );  

   	SetSunLight( 3, 3, 3.5 );
   	SetSunLight( 2, 2, 2.5 );
  	SetSunLight( 1.5, 1.5, 2 );
   	
   	wait( 0.0010 );
  
   	SetSunLight( 1, 1, 1.5 );
   	SetSunLight( 5, 5, 5.5 );
   	
   	wait( 0.0011 );
  
   	SetSunLight( 4, 4, 4.5 );
   	SetSunLight( 1, 1, 1.5 );
   	
   	wait( 0.0015 );
  
   	SetSunLight( 2.5, 2.5, 3 ); 
}

3.-Put this in your sounds

rain_outside,raw\sound\amb\weather\rain\outdoor\stereo\stereo_00.wav,evt_2d,,,ambience,97,97,100,0,0,0,default,default,allon,rdefault,5,priority,5,reject,0,0,0,100,100,0,1,2d,loaded,looping,,1,0,97,,quad,0,0,0,0,0,0.5,no,no,none,1000,no,,both,no,no,,,75,no,no,0,0,wma,yes,no,world,event,no,raw\sound\amb\weather\rain\outdoor\stereo\stereo_00_l.xm4,0,raw\sound\amb\weather\rain\outdoor\stereo\stereo_00_l.mp3,0,raw\sound\amb\weather\rain\outdoor\stereo\stereo_00_l.wav,0,mpl_kowloon,all
rain_inside,raw\sound\amb\weather\rain\indoor\stereo\stereo_l.wav,evt_2d,,,ambience,97,97,100,0,0,0,default,default,allon,rdefault,5,priority,5,reject,0,0,0,100,100,0,1,2d,loaded,looping,,1,0,97,,quad,0,0,0,0,0,0.5,no,no,none,1000,no,,both,no,no,,,75,no,no,0,0,wma,yes,no,world,event,no,raw\sound\amb\weather\rain\indoor\stereo\stereo_l.xm4,0,raw\sound\amb\weather\rain\indoor\stereo\stereo_l.mp3,0,raw\sound\amb\weather\rain\indoor\stereo\stereo_l.wav,0,mpl_kowloon,all

thunder_00,raw\sound\amb\weather\thunder\thunder_00.wav,amb_500,,,ambience,95,95,100,100,500,500,log2,log1,allon,rdefault,4,priority,5,reject,-100,100,0,10,50,0,1,3d,loaded,nonlooping,,1,0,95,,default,0,20,120,93,0.5,0.5,no,yes,none,1000,no,,both,no,no,,,65,no,no,0,0,wma,yes,no,world,ambience,no,raw\sound\amb\weather\thunder\thunder_00.xm4,0,raw\sound\amb\weather\thunder\thunder_00.mp3,0,raw\sound\amb\weather\thunder\thunder_00.wav,0,zmb_theater,all
thunder_01,raw\sound\amb\weather\thunder\thunder_01.wav,amb_500,,,ambience,95,95,100,100,500,500,log2,log1,allon,rdefault,4,priority,5,reject,-100,100,0,10,50,0,1,3d,loaded,nonlooping,,1,0,95,,default,0,20,120,93,0.5,0.5,no,yes,none,1000,no,,both,no,no,,,65,no,no,0,0,wma,yes,no,world,ambience,no,raw\sound\amb\weather\thunder\thunder_01.xm4,0,raw\sound\amb\weather\thunder\thunder_01.mp3,0,raw\sound\amb\weather\thunder\thunder_01.wav,0,zmb_theater,all
thunder_02,raw\sound\amb\weather\thunder\thunder_02.wav,amb_500,,,ambience,95,95,100,100,500,500,log2,log1,allon,rdefault,4,priority,5,reject,-100,100,0,10,50,0,1,3d,loaded,nonlooping,,1,0,95,,default,0,20,120,93,0.5,0.5,no,yes,none,1000,no,,both,no,no,,,65,no,no,0,0,wma,yes,no,world,ambience,no,raw\sound\amb\weather\thunder\thunder_02.xm4,0,raw\sound\amb\weather\thunder\thunder_02.mp3,0,raw\sound\amb\weather\thunder\thunder_02.wav,0,zmb_theater,all
thunder_03,raw\sound\amb\weather\thunder\thunder_03.wav,amb_500,,,ambience,95,95,100,100,500,500,log2,log1,allon,rdefault,4,priority,5,reject,-100,100,0,10,50,0,1,3d,loaded,nonlooping,,1,0,95,,default,0,20,120,93,0.5,0.5,no,yes,none,1000,no,,both,no,no,,,65,no,no,0,0,wma,yes,no,world,ambience,no,raw\sound\amb\weather\thunder\thunder_03.xm4,0,raw\sound\amb\weather\thunder\thunder_03.mp3,0,raw\sound\amb\weather\thunder\thunder_03.wav,0,zmb_theater,all

4.-Finally in your zone_source (mod.csv) add this:

include,rain

Plutonium

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