Pyrogenesis has two faces: one, the core engine itself, is written in C++. Ideally, only the most low-level functionality, which requires access to system interfaces or crucially needs to be very fast, is implemented here.

The other face of Pyrogenesis is a Javascript interface, which is accessed by specialized scripts through a number of runtimes.

Each runtime can be thought of as an instance of the SpiderMonkey Javascript interpreter used by the Pyrogenesis engine - it is a scripting environment or sandbox in which Javascript scripts are executed. Every runtime runs in isolation and can not immediately interact with the state of the other runtimes.

About scripting: engine creates multiple JS runtimes, one for simulation, one for AI, one for GUI and one for RMS. (Others?)