tracking with multiple LEDS

[dan12345]

my requirements -
at the beginning the head will be above the hand, but later on
the person being tracked is supposed to lift his hands above his heads, so not always - the same regarding the PPT we want to have on the person's leg -
at the beginning we planned to reset the positions, by assuming that
head > hand > leg height wise, but later on theoretically the person
might lower his hand beneath the ppt on the leg.

and the viewpoint should stay linked to the person's head...

so in conclusion there won't be any thing permanent throughout the
experiment, but we planned to perform an inital reset at the beginning,
and later on if for some reason something gets messed up, then to
have a keyboard callback which lets us press a key, and perform the same
height test, assuming head > arm > leg.

Thanks,
dan