In article <3dd8328e$1@news.povray.org>,
 "Wu Yang" <wya### [at] cswrightedu> wrote:

>   I have got the distance between the camera and the nearest intersection
> point. And I made the object move by adding "clock". What I want is the
> distance change between two pictures, the distance is to the same point of
> the object. Because the object I observe moved, so it is so difficult to
> track it. What should I do? Thanks

The first intersection points just won't be the same. Look at it this 
way: the points make up a sheet stretched over the scene from the point 
of view of the camera. As the object moves, the sheet "ripples", but 
doesn't shift around. You get one set of points on the object at one 
position, and an entirely different set of points on the object at a 
different position. If you want points on the object that move, this 
data is useless.
If you just want the change in distance to the camera, one possibility 
would be to compute the change in average or minimum distance. It would 
really help if you just said what you wanted...

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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