Ptolemy II is a dynamic systems environment hosted at UC Berkeley. It supports many types of “actors” that can be connected together to model real-time and synthetic-time systems. In last semester’s computer simulation class, Zach Ezzell pioneered some needed extensions in connecting this diagrammatic form of modeling to the type of immersive environment one finds in OpenSim. OpenSim is an open source multi-user virtual 3D environment that is compatible with Second Life viewers. Here is the complete description of the software and actors created, along with some videos. The highlight of the virtual environment interaction demonstration is the ability to set initial conditions in the OpenSim region, have this transmitted to the Ptolemy bouncing ball model, and then have the output from this model transmitted back into OpenSim. We plan to investigate this connection further this semester in a senior project.