title: projection of point on line in 3D
body: <p>I have point with x,y,z </p>
  
  <p>and line direction x,y,z </p>
  
  <p>how to get the point projection on this line </p>
  
  <p>I tried this code </p>
  
  <p><a href="http://www.zshare.net/download/93560594d8f74429/" rel="nofollow">http://www.zshare.net/download/93560594d8f74429/</a></p>
  
  <p>for example when use the function intersection in the code I got 
  the line direction is (1,0,0) and  the point (2,3,3) will have projection (value in x , 0, 0 ) and this is wrong value </p>
  
  <p>any suggestion 
  Best regards</p>