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Old 06-20-2007, 12:21 AM
mspusch mspusch is offline
WorldViz Team Member
Join Date: Feb 2003
Posts: 218
thanks for this info.
we don't fully understand your question.

with PPTX4, version 2.17, you should be able to select up to 8LEDs in the PPT user interface.

if you select three LEDs, PPT will always search for three LEDs and send their position coordinates. if you have the LED's positions, you can do with this data whatever you want to do.

Please make sure to follow the PPT instructions for setup and calibration, and specifically so the 1-point calibration as described in the manual.

this will give your PPT the info about how you are moving in the space and allow to optimize tracking for your individual movement speeds.

PPT is generally pretty good with holding on to individual LEDs, however the LEDs do not have an individual identification (i.e. from the PPT-s perspective look all the same). Therefore, if you are tracking head and hands and you only use three LEDs, then you will need to introduce certain criteria to distinguish.

Please have a look at thread

for some sample algorithms.

Another option that works quite well is to use two LEDs on a stick with a fixed distance for at least one of the hands.
This allows to distinguish left and right hand even after rotation.

hope that helps.
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