title: How to calculate the specified coordinate of a curve path in a 3D space?
body: <p>this is my first question here.</p>
  
  <p>Let's say I have an 3D object facing to somewhere at starts, and it is keep rotating and moving forward to where it facing constantly. It has given the start position, speed, the angle it facing at start, and the angle it facing after a time point. How can I calculate the coordinates at any time point I specified?</p>
  
  <p>Thank you very much.</p>