🚀 go-pugleaf

In article <drues.703291186@pv320a.vincent.iastate.edu> drues@iastate.edu writes:
>In <1992Apr7.031033.19729@njitgw.njit.edu> andrews@rehab.njit.edu (John Andrews) writes:
>>     I am looking at using a 3-SPACE digitizer from Polhemus
>>     (also called ISOTRACK, Kaiser Aerospace) and am looking
>>     for any information on this system or perhaps similar
>>     systems from competing companies.
>
>I bought one of these systems for my research several months ago.
>It works well but is very sensitive to electronics/metal objects in the
>area.  The software that comesw with it is pretty lame.  You have to 
>write your own code (in C) to use it to do anything useful.  It is being
>used in a variety of applications, not just VR.
>
>The Isotrak gives location (x,y,z) AND orientation (pitch, roll, yaw) for 
>a total of 6 degrees of freedom.  I don't see how you could get all that
>using ultrasound (especially the 3 angles).
>
>>     Has anyone any experience with this? Somethign similar?
>>     A better way to locate and track something in 3 dimen-
>>     sions? This system will run me over $10,000, so any and
>>     all responses greatly appreciated.
>
>No way. The base system (1 source and 1 probe) goes for about $3300.  
>If you ask them right, who can buy a used sytem (same warantee) for half
>that.  
>
>If you want more info, let me know.
>
>mike
>
>-- 
>Michael Drues                              Dept. of Biomedical Engineering
>Internet:drues@iastate.edu                        1146 Veterinary Medicine
>BITNET:v2.med@isumvs.bitnet                          Iowa State University
>Office:(515)294-6520(or 4-1771) Home:(515)233-5652        Ames, Iowa 50011



This is true. I should have mentioned I don't need the 3d positition of a *point* in 
space but of a *plane*, which requires the additional degrees of freedom. That is
where the Polhemus was useful (as are a few other systems).

But system latency is a problem with Polhemus, from what I have been told. It is too slow
for tracking most movement.

As for your pricing, the 3300 is for a single-sensor, and I need more than that. I need to
make referenced measurements, so I need the two -sensor-input system, which runs $9900
plus the $900 for the additonal sensor. It is an expensive system.

Referenced measurements also demand more of the system latency, enhancing the problem
with Polhemus.

									-=john

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