   Simple animation
  Hi all,I have two points in 3-D space, say startpoint and destpoint. Both are stored in 3-D vectors. I have an aircraft that must fly (for now, in constant speed) from startpoint to destpoint and stop at destpoint. How to perform this kind of animation? I know how to move the aircraft to destpoint, but I don''t know how to stop it when it already there. I just use translation matrix to move the aircraft. Thanks a lot. 
  If I understand you correctly you are already drawing the plane at the origin and using translation to get it to the destination.So all that you need is to do a linear interpolation between start and end point.if you have the time passed since the aircraft started at START and you want it to take 20 seconds to get to END the formula will be the following:currentPos = START + (END-START)*time/20notice that if time=0 (the plane is just starting) the position will be START, and if time=20 the position will be END (just checking if the formula is correct, always a good practice)so instead of translation over (END.x, END.y, END.z) you translate over (currentPos.x, currentPos.y, currentPos.z) ;  That''s what I need. Thanks very much for your help. ;  no problem, you''re welcome 