@uwu1ba Source 1 also. I don't think there's not much sense in holding on to it for them any longer, as they port all their active projects onto Source 2 these days, and in the right hands Source 1 can still be magical.
There's the issue of Havok, though, and I don't know how tightly integrated it is, and how much work it is to replace it with something like ODE or somesuch.
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