I saw your post and modified one of the templates to look a little more like rain. Perhaps you can improve this effect.

code:

---

/////////////////////////////////////////////////////////////////
BMAP rain_map,<rain.pcx>;
var rain_mode = 0;
var rain_pos;
var rain_rate = 60;	// raindrops per second
var rain_counter;
// start rainfall  around the player
// original idea by Harald Schmidt
function rainfall()
{
	if(player == NULL) { END; }
	rain_mode = 1;
	while(rain_mode > 0)
	{
		// all raindrops will start 50 quants above the player
		rain_pos.Z = player.Z + player.MAX_Z + 50;
		//	depending on the frame rate, create several raindrops at the same time
		rain_counter = rain_rate * TIME;
		while(rain_counter > 0)
		{
			// place raindrop somewhere near the player
			rain_pos.X = player.X + RANDOM(500) - 250;
			rain_pos.Y = player.Y + RANDOM(500) - 250;
			// now create one drop (emit 1) at this position
			emit(1,rain_pos,rain_particle);
			rain_counter -= 1;
		}
		wait(1);
	}
}

function rain_particle()
{
// just born?
	if(MY_AGE == 0)
	{  // this simple rain should do nothing more than fall to earth
		MY_SPEED.X = 0;
		MY_SPEED.Y = 1;
		MY_SPEED.Z = -5; // experiment with this value
// Set the size and color you want (or maybe a bitmap)
		MY_SIZE = 20;
//		MY_COLOR.RED = 255;
//		MY_COLOR.GREEN = 255;
//		MY_COLOR.BLUE = 255;
		my_map = rain_map;
		my_transparent = on;
		END;
	}
// remove raindrop if below player's feet
 	if((player == NULL) | | (MY_POS.Z < player.Z - 100))
	{
		MY_ACTION = NULL;
	}
}
ON_R rainfall;

---

It would nice to figure out how to keep it from raining indoors and how to make puddles on the ground and such.

Here is the particle I used if you want it:

www.spiritshock.com/downloads/rain.zip

[This message has been edited by Eldurin (edited 15 May 2001).]