[IGSTK-Users] Tool positions or Tools Translations?

[Eric L. B.]

Hello...

I'm using a NDI Polaris tracking system.

I know that IGSTK is not supported for single markers tracking. Thats why i'm looking for another option.

I have a passive tool with three markers. With the tracking system i can get the position of one of the spheres, because the origin of the coordinate system is exactly in one sphere.

With this information i want to rebuild the position of the other two spheres. Graphically, I draw the other two spheres and set observers to each sphere. With this, i think i can get the transformations that correspond with the real reflective spheres.

Comparing the position returned by the observer of sphere 1 (origin of the coordinate) with the information of the tracking of the passive tool, this data math. Then i suppose that the other two positions returned by the observers for spheres 2 and 3 must match too, but its not true :( There are, in the best case, positions not corresponding with the coordinate system, they are transformated.

Then, i don't know if i'm using the data correctly. The information of a transform returned by the observer is the rotation (GetRotation) and translation (GetTranslation) or is the position and rotation.

How can i get the orientation of the tool??

 

Regards,

Eric

 

 

Image Analysis And Visualization Laboratory
Centro de Ciencias Aplicadas y Desarrollo Tecnologico CCADET UNAM
Circuito Exterior S/N, Cd. Universitaria,
AP 70-186, CP 04510 Mexico, DF
Tel: +(52)(55) 56 22 86 02, ext. 1130

 


 

*************************************************** 
> Date: Mon, 29 Jun 2009 10:17:09 -0400
> From: zivy at isis.imac.georgetown.edu
> To: eric_lb at hotmail.com
> CC: igstk-users at public.kitware.com
> Subject: Re: [IGSTK-Users] Tool positions or Tools Translations?
> 
> Hi Eric,
> 
> Which tracking system are you using?
> 
> Currently, IGSTK does not support tracking of single markers 
> (MicronTracker's XPoint or NDI's reflective spheres). All tracked 
> objects consist of at least three points, with IGSTK sending the 
> relevant API commands to the tracker based on the assumption that we are 
> tracking a frame (coordinate system).
> 
> regards
> Ziv
> 
> > -- 
> Ziv Yaniv, PhD., Research Assistant Professor
> Imaging Science and Information Systems (ISIS) Center
> Department of Radiology
> Georgetown University Medical Center
> 2115 Wisconsin Avenue, Suite 603
> Washington, DC, 20007,
> 
> Phone: +1-202-687-7286
> Fax: +1-202-784-3479
> email: zivy at isis.georgetown.edu
> web: http://isiswiki.georgetown.edu/zivy/
> > > ------------------------------------------------------------------------
> > 
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