So there's several different ways to break up the straight voronoi fracture edges, but I wanted a really simple, straight forward solution. This is what I came up with. :) Note! If you get bad edges, it's usually not the edge but the interior detail in the voronoi SOP - so mess with the interior detail settings before messing with the edge for solving such issues. :) Scene file: https://goo.gl/OxXDHU (kinda heavy, didn't downres, sry) Also added a scene file for setting up highres pieces with a lowres sim here: https://vimeo.com/178222797