As an addendum to the above, you can of course direct the voronoi shatter by fracturing the geometry first yourself, to create fault lines. Here's a box cut first with spheres, and then run through the regular voronoi shatter. It's much better to do the voronoi shatter independently for each piece in a foreach loop, otherwise the voronoi cuts will slice through all your pre-created pieces. This way the cuts will be in different places for all pre-created slices, and the fault lines you