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Hi, all
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
Best Regards
Wu Yang
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In article <3dd8328e$1@news.povray.org>,
"Wu Yang" <wya### [at] cs wrightedu> 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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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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On Sun, 17 Nov 2002 19:22:24 -0500, "Wu Yang" <wya### [at] cswrightedu> wrote:
> Because the object I observe moved, so it is so difficult to
> track it. What should I do?
http://mathworld.wolfram.com/Distance.html
ABX
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On Mon, 18 Nov 2002 02:14:50 -0500, "Wu Yang" <wya### [at] cswrightedu> wrote:
> What I need is the Range Rate of every intersection point not just the
> average and minimum Range's.
Then instead of creating object and patching POV just open editor and create
objects as set of points on their surfaces and calculate changes for each
point separately.
ABX
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In article <3dd89338@news.povray.org>, "Wu Yang" <wya### [at] cswrightedu>
wrote:
> >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 a point on the object that moves around with the
object, there is no need for patching POV. Just define a point that is
on the object, or at the center of it, or whatever you want to define it
as, and then apply the same transformations to that point and the
object. If you had just said this at the beginning, your question could
have been answered then, there would have been no need for all these
messages and threads.
> >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.
Read what I said again...the *change* in average or minimum distance.
You must define what you want "range" to be, it could be average or
minimum distance, distance to a constant point on the object, or
something else. The change in this value would be the rate of distance
(or "range") change in units per frame. However, even if you decided to
do it this way, patching POV is not necessary, it could be done in the
existing scene language with the trace() function.
--
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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