It is so simple to create animation through sketchup. Just a simple click of slide show or exporting animation will result some renderings that can moves, animating, just like creating movies.
"SketchUp has several ways of animating scenes. But due to its focus on architecture, they emphasize flybys of static models. Although they are easier to use than the technique described here, they don't provide the ability to build dynamic models of visual entities that move independently on their own volition. The figure shows the kind of animation we'll be concerned with here. The goal is to animate the dynamic elements in this picture (crew, airplanes, bombs, torpedoes, etc) against the background of the other static elements (landing strip, control tower, hangar, quarters). This involves giving each of the dynamic elements enough 'artificial intelligence' to govern their movements internally, influenced by their interactions with other elements of the simulation."to find out more...
For more ruby scripts, you can find it through http://archsymb.com/ruby/
Passage from http://www.virtualschool.edu/animation/index.html