title: Euler angles between two 3d vectors
body: <p>How do you find the 3 euler angles between 2 3D vectors?
  When I have one Vector and I want to get its rotation, this link can be usually used: <a href="https://stackoverflow.com/questions/1251828/calculate-rotations-to-look-at-a-3d-point">Calculate rotations to look at a 3D point?</a><br />
  <br />
  But how do I do it when calculating them according to one another?</p>