Hi. It's simple. You create a nurbs or polygonal plan and set it to passive rigid body. Then create the domino pieces and align them in a row lying in the plane you've just created. Assign them a active rigid body node and a gravity field. Then, you just need to put a initial velocity or some other force to the firt piece and the others will fall!!!! That's easy. If you like this reply, please send me some answer. Zephirus