[PD] pix_artoolkit example

[Martin Schied]

hi again.

now I compiled the current gem release 0.92.1 from sourceforge (I could 
not find pix_artoolkit in svn)

it contains some changes compared to my older version of pix_artoolkit 
source code, but unfortunately again no markers are recognized with my 
setup (pix_artoolkit does't output anything on its right outlet.)

I also had a look at the "cube" part of the help patch you sent me and 
also the sources of pix_artoolkit. It seems it outputs 7 values which 
are: the translation (position) as a vector x y z, an other vector 'x y 
z' which is the direction of the detected rotation axis (the "rotation 
normal") and a rotation angle around this axis. so the "draw cube" part 
of your help patch should work just fine if everything else (marker 
detection, marker recognition) works. maybe the size of the cube (40) is 
too big to see anything or the cube is only drawn behind the video. i 
changed that, see attachment.

when i was working with tracking data in general I scaled everything to 
usual gem units, so that for example a desired range of 0 to 40 cm went 
from 0 to 4. so it fits in the usual gemwin for quick tests.

I have no idea which units the external will output  - choose a smaller 
size for the marker than 80, until you can see something useful.

my assumptions about the output of pix_artoolkit from yesterday are 
completely wrong (there's no matrix output) - so the patch I sent you 
before is pretty useless - sorry for that.

if pix_artoolkit is working for you (outputting anything on its right 
outlet), I'd be interested in what camera, resolution, version of Gem 
you are using. Some output of the external would also help me improving 
the help patch - if necessary.

cheers
martin
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