I'm working on an ARToolkitPlus-based application in which 5 different 
markers are used as tools to interact with a child's personal tile upon 
which a virtual plant is grown.  The kids have a sunlight tool, a 
watering tool, a nitrogen tool, etc.  The camera is fixed overhead.

If I understand correctly, the TrackerMultiMarker is for cases when 
multiple markers exist but their relative position/orientation is fixed. 
What I'm doing at the moment is using a hacked version of 
TrackerSimpleMarker that splits the existing 'calc' method into two 
parts, marker detection and pose estimation.  I then call the pose 
estimator for every found marker of interest.  Does this sound reasonable?

Cheers,
Darran.

-- 
Darran Edmundson [darran@e ............]
Interactive visualization for museums and industry
http://www.edmstudio.com

Darran Edmundson wrote:
> I'm working on an ARToolkitPlus-based application in which 5 different
> markers are used as tools to interact with a child's personal tile
> upon which a virtual plant is grown.  The kids have a sunlight tool, a
> watering tool, a nitrogen tool, etc.  The camera is fixed overhead.
>
> If I understand correctly, the TrackerMultiMarker is for cases when
> multiple markers exist but their relative position/orientation is
> fixed. What I'm doing at the moment is using a hacked version of
> TrackerSimpleMarker that splits the existing 'calc' method into two
> parts, marker detection and pose estimation.  I then call the pose
> estimator for every found marker of interest.  Does this sound
> reasonable?
i'm not sure what the questions is since your approach is obviously
working fine.
the multi-marker tracking is - as you said - only for multiple markers
in a fixed relative position that should be treated as one large marker.

Daniel

It sounds reasonable, I would have done what you did Darran.

On Aug 7, 2006, at 1:55 AM, Daniel Wagner wrote:

> Darran Edmundson wrote:
>> I'm working on an ARToolkitPlus-based application in which 5  
>> different
>> markers are used as tools to interact with a child's personal tile
>> upon which a virtual plant is grown.  The kids have a sunlight  
>> tool, a
>> watering tool, a nitrogen tool, etc.  The camera is fixed overhead.
>>
>> If I understand correctly, the TrackerMultiMarker is for cases when
>> multiple markers exist but their relative position/orientation is
>> fixed. What I'm doing at the moment is using a hacked version of
>> TrackerSimpleMarker that splits the existing 'calc' method into two
>> parts, marker detection and pose estimation.  I then call the pose
>> estimator for every found marker of interest.  Does this sound
>> reasonable?
> i'm not sure what the questions is since your approach is obviously
> working fine.
> the multi-marker tracking is - as you said - only for multiple markers
> in a fixed relative position that should be treated as one large  
> marker.
>
> Daniel