[IGSTK-Users] Needle object disappers during tracking

[Patrick Cheng]

Hi Fucang,

Thank you again for the detail3e report on this.

This is a known issue has to do with the igstkObjectRepresentation
internal state machine transition table. There were discussions on
whether to simplify the state machine of this class or not. Our chief
architect Luis Ibanez is working on adding a complete regression test to
verify and fix this problem, this is also the best way to do the
extensive testing.

Luis is quite busy all the time, I hope he can give us some update on
this soon.

For right now, in my local copy, I put fixes to get around the buggy
performance of the class to get the application working.

Please try the code attached.

Thank you,

Patrick

Fucang Jia wrote:
> Hi, Patrick,
>  
> I am using NeedleBiopsy app to do tracking. At first, the needle and the 
> tip of
> the needle display 100ms then disappear. When I change the line 80 in 
> NeedleBiopsy.cxx
> transform.SetToIdentity( 100 );
> to
> transform.SetToIdentity( 1e300 );
>  
> The needle and tip display well.
>  
> But the needle and the tip will disappear forever in three conditions:
>  
> 1. During tracking by Vicra, if the passive sphere marker was blocked, 
> then the transform can not
> get, then the needle and the tip will disapper, even though the passive 
> sphere can be seen
> from the Vicra again.
>  
> 2. During tracking, if the 3D scene was adjusted by mouse, then the 
> needle and the tip will
> disappear in a moment.
>  
> 3. When press the "Stop" button, then press the "Tracking" button, the 
> needle
> and the tip will not display.
>  
> Could you give any hints to solve this problem?
>  
> Thank you!
>  
> Fucang
>  
>  
>  
> 
> 
> ------------------------------------------------------------------------
> 
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