title: 3d (THREE.js) : difference matrix
body: <p>I would like to save the info that represents the relative difference between two THREE.Object3d. I prefer to save the data as a transformation matrix.</p>
  
  <p>Can someone knows what do i need to do to get this?</p>
  
  <p>I would like to have a matrix4 that later on i could apply on an object and it will  move/rotate by the same values.</p>
  
  <p>Thanks</p>