On: Resetting Xbox

[mvdtnz]

So not games.

[Rohansi → mvdtnz]

Try reading between the lines. Why would Valve be developing a new game physics engine internally?

[mvdtnz → Rohansi]

Valve switched existing games to Rubikon to avoid paying licensing fees for their former physics engine.

[Rohansi → mvdtnz]

Yes but it's not just Rubikon anymore. They are working on a new physics engine called Ragnarok. I highly doubt they're making a whole new physics engine just for their existing games because Rubikon is working fine there.