Quote:zwidth:
Optional tag: If you want your itr to influence a larger area on z-axis, you can use this tag. Actually if you set a zwidth of 20, the itr will hit everything which is 20px up the z-axis and also everything which is 20px down the axis, so the zwidth goes in both directions and the area is 40px on z-axis on the whole (if you're exact and count the middle line of the shadow it's 41px).
If there's no zwidth the default zwidth for every itr is 12px in each direction of z-axis...