[IGSTK-Users] spatial object after expired data validity AND tracker updating signal instead of position

[Andinet Enquobahrie]

Hi Aswin,
> Hi everyone,
>
> I have noticed that in case I lose connection to my tracker, the 
> spatial object connected to it disappears after the data validity time 
> has expired. Would it be possible to change the color of the spatial 
> object, say from green to red, rather than letting it disappear 
> altogether?
>
You are correct. The current behavior is that the object will disappear 
if the transform
time expires. We would like to keep it as it is in cvs ( main distribution )
However, for your own use, you can locally modify the state machine 
configuration in
ObjectRepresentation class to be able to change the actor color when the 
transform
time expires.  It is straight forward to do that.

In the ObjectRepresentation::RequestVerifyTimeStampAndUpdateVisibility() 
method,

1) InvalidTimeStamp input gets invoked if the time expires, otherwise 
the ValidTimeStamp input
will be invoked.

2) These state input will initiate a transition to methods that will 
turn on/off the actor
visibility. All you need to do is modify these methods and change the 
actor colors instead of
turning on/off the visibility.

> Also, I need to write a tracker for spirometer input through NiDAQ. 
> Now, by default, a tracker updates a transform. But mine's more of a 
> signal (breathing) than position. Should I just write it that the 
> signal is one axis of the transform with the other two set to zero? Is 
> there a better way?
Yes, for minimal change, you can store the signal value as one of the 
components
 of the translation vector of the tool transform and keep the others to 
zero.  You will need
 to write NiDAQ specific tracker and trackerTool classes. You might want 
to start
with the current tracker classes.

Let us know if you more questions..

-Andinet



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-- 
==========================================================
Andinet A. Enquobahrie, PhD
R&D Engineer
Kitware Inc.

28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x124
www.kitware.com