[IGSTK-Users] Code broken in CVS?

[Patrick Cheng]

Hi Anka,

That's great! Would you like to commit that back to the IGSTKSandbox?

Thank you,

Patrick

Anka Kochanowska wrote:
> Thanks!
> Now tracing is lot easier. I copied the changes to trace Polaris pointer.
> 
> Anka:-)
> 
> 
> Patrick Cheng wrote:
>> Hi Anka,
>>
>> I made a few changes to the example application.
>> Please check out the cvs code and give it a try.
>>
>> Below is a brief description of the problem:
>>
>> Problem: Objects do not show up in the window. Camera unable to find 
>> its focus
>>
>> Cause: This is because of the single thread limit. Tracker hasn't got 
>> a chance to update TrackerTool until the
>> igstk::PulseGenerator::CheckTimeouts(); get called in the main loop.
>>
>> If we setup the scene graph connection as:
>> object --> tool -x-> tracker <-- View
>> View can not reach object thus unable to adjust it's focus when 
>> ResetCamera is called.
>>
>> Solution: Attach the object to the Tracker instead of TrackerTool at 
>> startup. Switch to TrackerTool after tracking started.
>>
>> Results: You should see the ellipsoid and cylinder in the window 
>> (constant) at startup.
>> After tracking start, you should see them following your mouse position.
>> When stop tracking, they will disappear.
>>
>> Thank you for your support for IGSTK!
>>
>> Patrick
>>
>>
>> Anka Kochanowska wrote:
>>> Hi!
>>> Thanks for the clarification.
>>> I did not think of it this way. Usually tracking application show 
>>> something on start, but you are right - there is no reference, so 
>>> nothing to show. There is a call to reset camera in the example, and 
>>> I sometimes zoom and zoom and zoom and see nothing, although I know 
>>> that my pointer must be visible.
>>>
>>> Thanks again
>>> Anka:-)
>>>
>>> Andinet Enquobahrie wrote:
>>>> Anka-
>>>>
>>>>> Since there are no changes in the example code, something in IGSTK 
>>>>> must have been changed to cause the problems.
>>>>>
>>>>> So for now, I shall try to work with the release 3.0 again, hoping 
>>>>> for a fix in CVS.
>>>>>
>>>> You are better off sticking working with cvs version. Because, there 
>>>> were several other bug fixes....
>>>>
>>>> I just took a quick look at it your report and here are my comments
>>>>
>>>> 1) When you start the example application,  you "should NOT see" the 
>>>> cylinder and ellipsoid with the tracking turned off.  When tracking
>>>> is turned off, it means there is no tracking information which 
>>>> implies the transforms of the spatial objects are "expired" or
>>>> are invalid time stamps. So, what you are currently observing in the 
>>>> cvs version is the correct behavior.
>>>>
>>>> The behavior in  release 3.0 was wrong.  The spatial objects show up 
>>>> upon start EVEN without tracking information.
>>>> 2) When you turn on tracking, although you will get valid transforms 
>>>> and renderings of the cylinder and ellipsoid spatial objects,
>>>> you will not see the renderings since the camera is way out of 
>>>> focus. If you zoom out repeatedly using the right mouse button,
>>>> you will see the spatial objects. We might need to add a camera 
>>>> reset call to bring the renderings to the the widgets field of view.
>>>>
>>>>
>>>> Hope that helps
>>>> -Andinet
>>>>
>>>>
>>>>
>>>>>
>>>>> _______________________________________________
>>>>> IGSTK-Users mailing list
>>>>> IGSTK-Users at public.kitware.com
>>>>> http://public.kitware.com/cgi-bin/mailman/listinfo/igstk-users
>>>>>
>>>>
>>>>
>>>
>>>
>>
> 
>