Well, in Bryce there is not really anything like filters in photoshop. Bryce is a 3d program and acts in a different manner. For such programs, you can ask how to use or get a better texture for your objects to make your objects more realistic. I guess u can call that using filter in Bryce! 'cause you are changing the looks of your objects. Now I am in a hurry. Will let you know later how to use great materials in Bryce.