1. A method for a real-time interactive physics-based simulation, the method comprising: executing a precise logical thread, wherein said precise logical thread computes a full set of data for everything that occurs in each graphical frame of said physics-based simulation with accuracy and stability; and executing at least one fast estimation logical thread, wherein said at least one fast estimation logical thread produces either estimated or partial data only to enable each graphical frame of said physics-based simulation to appear realistic, wherein the precise logical thread completes its evaluation at an end of a computation cycle, and the at least one fast estimation logical thread completes its evaluation prior to the end of the computation cycle.