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       #Post#: 4--------------------------------------------------
       Multimarker Tracking
       By: tomroesi Date: April 27, 2011, 3:39 am
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       Hello,
       i have a problem with the Build AR Pro 2 and the multimarker
       tracking.
       How schould i setup the tracker to work?
       I use the multi.dat and the "abcdef" marker but nothing works.
       #Post#: 8--------------------------------------------------
       Re: Multimarker Tracking
       By: Giles Westerfield Date: April 30, 2011, 1:50 am
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       Hello,
       Sorry for the lack of explanation regarding multi-markers in the
       help documentation. They are a somewhat advanced feature that
       can be little tricky to set up.
       A multi-marker is simply a group of normal (single) markers that
       are treated as if they are a single marker. Multi-markers can be
       useful for scenes where parts of the marker may be occluded for
       any reason. As long as at least one of the single markers on the
       multi-marker is visible, the marker will still be tracked
       properly.
       To create a multi-marker, you will first need a regular pattern
       file for each of the single markers that are part of the
       multi-marker. Then you will create a special .dat file that
       tells BuildAR the locations of the pattern files and how they
       are positioned relative to each other on the multi-marker.
       The .dat file is just a normal text file, and you can create it
       using a text editor like Wordpad. The format of the .dat file is
       explained in this image:
  HTML http://www.hitl.washington.edu/artoolkit/documentation/images/multiconfigfile.jpg
       I've attached an archive to this post containing a sample
       multi-marker .dat file along with the individual pattern files.
       You can edit the .dat file to use your own pattern files. Please
       note that the paths to the pattern files in the .dat file need
       to be relative to the BuildAREditor executable.
       The transformation matrix part of the .dat file entries may seem
       confusing, but you only need to worry about the last column of
       numbers if the patterns are all facing the same direction. From
       top to bottom, the top three numbers of the last column of the
       transformation matrix represent the x,y,z position (in mm) of
       the current pattern file relative to the origin of the marker.
       You don't need to worry about changing these numbers if you are
       using the same layout for your multi-marker.
       Let me know if you need more help with multimarkers. My guess is
       that you do not have the correct file paths in the multi.dat
       file. Make sure the the file paths to each of the "abcdef"
       patterns is relative to the BuildAR executable.
       Cheers,
       Giles
       #Post#: 93--------------------------------------------------
       Re: Multimarker Tracking
       By: evansjaw Date: September 12, 2011, 4:20 pm
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       I tested your multi marker example and a modified one of my own.
       This feature currently does not work. multi.dat does not load
       when you hit ok on the "Add ARToolKit Marker" dialogue box.
       Nothing loads. Should it not be a dat? Can you give an example
       where it does work? Im rather disappointed because this is one
       of the functionalities that I bought your product for.
       If you do go back in and fix it, It would be great to give it
       "cases". ie:
       case1:
       A,B,C visible not D
       case2:
       A,B,D visible not C
       #Post#: 103--------------------------------------------------
       Re: Multimarker Tracking
       By: nicomurillo Date: September 29, 2011, 2:34 pm
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       The folder is renamed to multi (not multi-marker) and placed in
       the data folder, not markers.
       But how to make two markers interact with each other?
       and
       If you do go back in and fix it, It would be great to give it
       "cases". ie:
       case1:
       A,B,C visible not D
       case2:
       A,B,D visible not C
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