In this assignment I would like you to place two eyes (sphere.obj) in the into the Skull.obj. The two eyes need to be parented to the skull such that when the
head rotates the eyes move as well. You will need to implement the Trackball code (see Helpful tools) to do the rotations or just use keyboard events. Be sure to scale the eyes to a reasonable
size and translate them into the correct position. I will discuss all this in class.
