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1) if we want to use the vcc_male avatar, how do I figure out what the named key should be for the tracker in line 1 of your code? 'head_tracker' doesn't seem to work.
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The tracker name is the name given in the trackers tab of vizconnect.
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2) Can you give me a little more detail on the scaling function? I'm assuming that, if the tracker moves x units (let's say in the z-plane), then postScale([1,1,5]) would move the rendered avatar 5x units. Is that true?
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Yes, that should work
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Also, can the scaling constant be less than zero?
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It can be a number between 0 and 1 if you want to reduce the speed.