Thank you for your reply.

>It would really help if you just said what you wanted...

  I called the distance between the camera and a intersection point the
RANGE of that point, and what I want now is the Range Rate of that point
when the object moves. Range and Range Rate are two important parameters for
Target Tracking. I am now trying to generate date (Range, Range Rate) from
this program for a target tracking test.


>If you just want the change in distance to the camera, one possibility
would be to compute the change in average or >minimum distance.

What I need is the Range Rate of every intersection point not just the
average and minimum Range's.


>The first intersection points just won't be the same.

Yes, I agree. This is exactly the difficulty to get the Range Rate.

Best Regards
Wu Yang

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