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I want to calculate elbow angle between arm reaching the horizontal and the end of the arm action when throwing a ball using skeletal data acquired from Kinect. Please answer me, anyone knows how to extract only the skeletal frames of arm reaching the horizontal and the end of the arm action and how to calculate an angle between them.

Dulani Ranasinghe
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    Unfortunately this question is too broad for the format of StackOverflow. Please read [What topics can I ask about here?](https://stackoverflow.com/help/on-topic) and [What types of questions should I avoid asking?](https://stackoverflow.com/help/dont-ask). If you have a piece of code and a specific problem you can ask here how to solve this specific problem. But people here will not be inclined to write half a novel to answer a broad question. Good luck :) – Mong Zhu Dec 14 '17 at 07:24
  • https://math.stackexchange.com/questions/974178/how-to-calculate-the-angle-between-2-vectors-in-3d-space-given-a-preset-function , http://www.analyzemath.com/stepbystep_mathworksheets/vectors/vector3D_angle.html – Fildor Dec 14 '17 at 08:13
  • And this even gives you code for kinect: [Display the angles of each joint of the skeleton in kinect c#](https://stackoverflow.com/q/11061287/982149) – Fildor Dec 14 '17 at 08:39
  • Thank you very much – Dulani Ranasinghe Dec 16 '17 at 15:08

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