Partial Downswing Fitting

We're experimenting a little with fitting the downswing as two separate parts. We're manually identifying the "crossover" frame, the point at which the club head passes 2*Pi (the club directly to the right of the reference point).

The first part of the downswing is being fit a little better.





The second part of the downswing is too gruesome to show. The curve is completely erratic. One likely source of error is that at the end of the swing, the club head is closer to the reference point than the hand, so we choose the wrong end of the line segment to be the club head. An easy way to solve this problem is to only track up to a certain point, such as Pi/2, where the club is directly over the reference point (and is still farther than the hand).