It only draws a single perspective, so the only control you have is to refresh the page to get a new random bit of terrain.

I made a jsfiddle and added dat.gui http://workshop.chromeexperiments.com/examples/gui/#1--Basic... so you can modify the "detail" parameter to change the terrain without requiring a page refresh http://jsfiddle.net/kachhalimbu/br8Xd/1/ Full screen result here http://jsfiddle.net/kachhalimbu/br8Xd/1/embedded/result/