box2d
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Study b2NLerp
Compare with quaternion nlerp.
Complex number nlerp is accurate to ~4 degrees while quaternion nlerp is accurate to ~1 degree.
Investigate switching to a 2D quaternion for v3.2
I think this will make rotation more expensive. The current setup is basically matrix time vector, which is faster than quaternion rotation. Doesn't seem to be worth the trade-off.