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I agree with kelly, touch is better, otherwise what you have is a 'popup'. i prefer the opt-in protocal of touch based activation. but use the sensor to note if the AV leaves the area. When i come to including any streamming stuff, i'll definatly look to optimizations like the above.
on a similar note, i'd like AV's to be able to attend an event invisably(i mean without their lag inducing avatar, just a nametag for interaction)
do you have any other performance enhancing notions? e-mail me cuz i don't know how often i'll get back to this site.
thanks.