Much of this is merely conceptual. The best way to learn about animation is to simply TRY it! The linking and tracking system in Bryce is quite inferior, as you cannot animate those functions. You cannot key-frame an object tracking from one object to another. So we have to make work-arounds! Thus, the Hidden Sphere, as opposed to merely having the laser track the Asteroid itself... With the sphere one could have the laser gun shoot one asteroid, then swivel and shoot another one, and another, and one like that... Fran, in the Forums, you can always "Search". Enter a keyword, like "Laser", or "lordstormdragon", and you will be able to find this page for months, if not years! Sometimes, for fun, I do a search for, "shadowdragonlord"...