Given a circle with a known center point and two points on the circle (thus known radius), how do I determine the angle of the minimum arc between the two points on the circle?
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Given a circle with a known center point and two points on the circle (thus known radius), how do I determine the angle of the minimum arc between the two points on the circle?
Turn the center to the two points into a pair of vectors, then shove through this.
So, cos-1 ((x1x2 + y1y2 + z1z2) / r2).