Why is the point cloud data upside down?

[Greg]

Hello,

Working with the points returned by
SimpleOpenNIContext#depthMapRealWorld(), I was wondering why they come
back upside down by default? In order to get the points right way up
you have to call rotateX(radians(180)); before drawing them a la this
example:

https://gist.github.com/1051537

All of the examples that ship with the library do this as well. Why is
this the case? Why doesn't the library return points oriented right
way up? Is there a practical reason for this?

Thanks,

Greg

[maxOh]

hi greg,

i use the coordinates the way it comes out from openNI. OpenNI uses also
the left-handed coordinate system:
http://paulbourke.net/geometry/leftright/
But in processing the positive y-axis shows down(the coordsys is upside
down), so i had to rotate it 180deg around the x-axis to display it nicely,

max

[Barbara Castro]

Hi guys,

I'm creating an interactive installation in which I'd like to hung the kinect upside down in the ceiling. I am running some gesture recognition tests that are not working. Does this affect the possibility of recognition? 

Thanks in advance!