Imagine two vectors, A and B.
C is a regular weighted average of the two vectors, say clock*A +
(1-clock)*B.

With this type of average the vector-point is linearly "interpolated", but
the rotation and length of the vector is not.

To make the length of C linearly interpolated is easy, but how do I linearly
interpolate the "rotation"?

I need a general method that can average not just two, but multiple vectors.
How can I do this?

Rune
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