# zTrack - by Roland Hess 2005
# Wrote it for myself - hope it helps you
#
# Orients selected objects (probably cards)
# toward the object named "Camera"
# but only rotates their Z axis, so
# the cards remain upright. Great for
# trees and forests.
	
from Blender import *
import math

obloop=Object.GetSelected()

camera = Object.Get("Camera")
cameraloc=camera.getLocation()

for plane in obloop:
	planeloc = plane.getLocation()
	
	dx=cameraloc[0] - planeloc[0]
	dy=cameraloc[1] - planeloc[1]

	planeZ=math.atan(dx/dy)

	planerot = plane.getEuler()
	print planerot[0],planerot[1],planeZ	

	plane.setEuler(planerot[0],planerot[1],-planeZ)