Rubikon

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Rubikon mascot used in Sergey Migdalskiy's lecture at GDC 2014.

Rubikon is Valve's custom CPU based^[1] physics engine used in Source 2. It replaces Havok, which is the main provider of physics for Source engine games.

Valve switched from Havok to Rubikon in order to reduce licensing cost.

Forks

S&box uses modified version of Rubikon physics engine called "Box3D", which was designed to be constantly updated.^[2]

External links

• Rubikon at GDC 2014 —  Valve's Physics for Game Programmers.
• Document from GDC 2014 — Sergiy Migdalskiy Debugging Techniques.pdf ( Archived version).

References

References
1. Dirk Gregorius (March 10, 2015). "Rubikon : Valve's physics engine for Source 2". Real-Time Physics Simulation Forum. Retrieved on October 13, 2025. 2. gvarados (@gvarados) (August 3, 2024). "S&box has a new Physics Engine".  X (Twitter). Retrieved on October 13, 2025.