>For now, I only have to worry about one finger - but
>need to track position in 3 dimensions with a resolution
>of about 5mm over an area of 1 cubic meter.  Also,
>the device cannot use a reflective method (such as ir
>or ultrasonic).    So far, I have investigated using
>accelerometer chips, but these are still fairly expensive
>and I would like a lower-cost alternative.

I suspect that accelerometers will have long term drift. What sort of long
term accuracy do you need?

One thought I had was to use one of those sensory gloves that are used for
virtual reality type things. You would need to have the person sitting to
get a reference point, or some other method of reference.

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