VECTOR Weatherbox;
VECTOR Wind_direction;	//Movement speed and direction


function Weather_part_event(PARTICLE *p)
{
	//keep the particle within the box
	vec_set(my.x,vector(cycle(my.x,camera.x-Weatherbox.x,camera.x+Weatherbox.x),
	cycle(my.y,camera.y-Weatherbox.y,camera.y+Weatherbox.y),
	cycle(my.z,camera.z-Weatherbox.z,camera.z+Weatherbox.z)));

	//update the movement speed and direction
	vec_set(p.vel_x,vector(Wind_direction.x,Wind_direction.y,Wind_direction.z));
	
	p.lifespan = 100; // live forever
}

function Weather_part(PARTICLE *p)
{
	//place particles at random positions within the box
	vec_set(my.x,vector(camera.x+random(Weatherbox.x*2)-Weatherbox.x,
	camera.y+random(Weatherbox.y*2)-Weatherbox.y,
	camera.z+random(Weatherbox.z*2)-Weatherbox.z));
	
	p.bmap = rainParticle;
	p.size = random(1)+2;
	p.flags |= MOVE;

	p.event = Weather_part_event;
}

function CreateWeatherParticles()
{	

	Wind_direction.x = 0;
	Wind_direction.y = 0;
	Wind_direction.z = -20;
	Weatherbox.x = 1000/2;
	Weatherbox.y = 1000/2;
	Weatherbox.z = 1000/2;
	effect(Weather_part,500,nullvector,nullvector);
}