# Name : XYZ Drag
# Description: simple Drag Daemon
# Author 	: Brandon  Young
# Date 		: Monday, December 10 2007
# Version	: 1.0

# Directions:
# apply to scripted daemon
# adjust dragxco, dragyco, and dragzco to get different results
#---------------------------------------------------------------------------------------------



# Function: applyForceToEmitter 
# This function is called by the simulation engine 
# when external forces should be applied to the    
# particles in the emitter.                        
#--------------------------------------------------

def applyForceToEmitter( emitter ):
	import math
	particle = emitter.getFirstParticle()
	dragXco = 0 # adjust these to adjust your drag.
	dragYco = 0
	dragZco = 0

	while particle:	
		vel = particle.getVelocity()
		velx = vel.x
		vely = vel.y
		velz = vel.z
		dragX = -1*dragXco*velx
		dragY = -1*dragYco*vely
		dragZ = -1*dragZco*velz
		drag = Vector.new(dragX,dragY,dragZ)
		particle.setExternalForce( drag )
		particle = particle.getNextParticle()
#--------------------------------------------------
# Function: applyForceToBody 
# This function is called by the simulation engine 
# when external forces should be applied to the body. 
#--------------------------------------------------

def applyForceToBody( body ):
	pass




#--------------------------------------------------
# Function: removeParticles 
# This function is called by the simulation engine 
# when it is safe to remove particles. 
#--------------------------------------------------

def removeParticles( emitter ):
	pass