This is my mini-arbd simulation package. The rigid-body is described as a collection of particles which do not have relative motion. I also add a test directory containing an example of how to simulate a system with thousands of proteins in NPC-like system. cd test/npc_proteins/; ln -s ../../mini_arbd; ./mini_arbd min_arbd.bd output > log & A trajectory named output.dcd will be generated with a log file named log.