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  #1  
Old 01-28-2010, 11:58 AM
just alex just alex is offline
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Join Date: Nov 2008
Posts: 18
Collision recording and external data saves

I have two semi-related questions. I know I can get vizard to output when an object collides with my participant, and it can output what collided, and I'm pretty sure I can get it to say the location of the collision, but I'm also trying to find a way to get it to output the orientation of the participant and get that all saved into another file (probably just a txt).
The other question I have is if it's possible to get vizard to automatically generate a txt or whatever file to save the data in and be able to change what the saved file is on it's own. For example, I run the program once to completion, then vizard saves the data in participant1.txt later that day, I run the program again, and vizard saves the data as participant2.txt
Is that possible to do, or will I just have to go in and manually rename the files after running the study?
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  #2  
Old 01-29-2010, 06:18 AM
GiudiceLab GiudiceLab is offline
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Join Date: May 2009
Location: Orono, ME
Posts: 49
We monitor our participant's orientation with an Intersense cube, and record orientation periodically to a datafile. Our code looks something like this:
Code:
response_orientation = marker.getEuler()
response_yaw = response_orientation[0]
datafile.write(str(response_yaw))
datafile.flush()
where 'marker' is the reference for the head marker (we combine PPT and Intersense data) and 'datafile' is the handle for the datafile. We have also used viz.MainView instead of 'marker' when the viewpoint is linked to the head orientation and referencing the marker would be difficult. Also, it may be apparent, but we are only interested in yaw. You could easily capture pitch and roll, though.

As for updating the filename, we prompt at the beginning of the script for a participant number, and use that to create the filename, like this:
Code:
# open a datafile for recording
subject = viz.input('Subject number:')
filename = 'datafiles/subject' + str(subject) + '.txt'
datafile = open(filename,'a')
I'm sure you could find a way to have the subject number auto-increment, but I think it would probably take more code that you really want.

Hope that is helpful!
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  #3  
Old 01-29-2010, 09:46 AM
just alex just alex is offline
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Join Date: Nov 2008
Posts: 18
Hmm, I'll take easy coding instead of trying to do something too fancy.
So, I think the collision code should look something like this
Code:
subject_orientation = tracker.getEuler()
subject_view = subject_orientation[0,0]
def mycollision(info)
   datafile.write 'collision'
   datafile.write(str(subject_view))
   datafile.flush()
right?
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