DOF material(s) for Realsoft 3D V5.1+

Instructions:
	- Load materials
	- Create camera
	- Select camera
	- Click on (create) backdrop
	- Set distance to a _very_ small value (so it's between the camera and the scene)
	- Set material to either one of the DOF materials
	- Set color to black
	- Accept
	- Select backdrop's material -> properties -> spec -> Mapping Type -> Camera
	- If you're using textured DOF, select an image for it (one is provided with the materials)
	- There's not much need for AA, unless you can't remove the grain with DOF sampling
	- DOF renders black if you set its RayCount over 25 or so
	- You'll need one more recursion (as the DOF needs one for itself)
	- Distance, map coords, etc. Won't be rendered correctly, tell me if you need them
		- This means that the post-blurred GI won't work (it wouldn't handle the DOF blur anyway)
	- I'd create a script that creates (and choreographs) the material so the user could use the camera controls,
	  but I have no damn idea how to calculate the CoC from camera parameters

2007-02-06 Timo Mikkolainen