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How Camp wrote:
> "Tom Austin" <taustin> wrote in message news:4474ae2b$1@news.povray.org...
>
>> Using a 3D area laser scanner, separate 'scans' are collected at each
>> location.
>
>
> Forgive the questions, but: What sort of laser, how long does a typical
> scan take, and what's the maximum resolution?
>
It's a time of flight laser that can gather about 20,000 data points a
second. It scans in a spherical grid (2 angles & a range). The
scanning window is about 80 degrees vertical and 340 horizontal.
Each of the scans in this animation is over 2 million data points - each
raw scan file is over 17Mb. A scan takes about 6 minutes to complete at
this resolution. The data is good to about 1/2 inch.
>
> I don't suppose each scan has an absolute position reference? You must know
> something about their positions relative to each other, obviously, or you
> wouldn't have been able to generate the fly-through like you did.
>
We do not know anything about the positions of the scans in relation to
each other except a hand sketch for rough positioning. We have some
software that neatly aligns the data automatically. All we need to do
is give it a very rough starting point.
Using survey points, we were able to align the data in a real coordinate
system.
> Warp has dealt with meshes quite a bit, perhaps he's got some ideas for
> joining them together...
>
maybe....
LAter... Tom
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