Universe Sandbox ² is an interactive space simulator which lets you play with gravitational motion, planetary collisions, climate, star development and much more. http://www.universesandbox.com This video shows a very first iteration of shock waves in the ground after a large scale collision. Now the physics side post shock events for which the graphics side (that being Georg Steinröhder) renders some very nice looking waves propagating through the surface. Currently the shock heating is not included, but that is being worked on.