Hello

How many PS3 Motion controllers can I use in my scene?

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Hi
Max 3 controllers per actor (2 hands and 1 head).

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Is it restriction of iPi soft, PS3 Eye cameras or some else? If I use two actors in one scene, I can use 6 PS3 Move controllers?

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It's a restriction of iPi Mocap Studio that motion controller's data can only be attached to the head or hand bones.
Yes, you can use 6 PS Move controllers for 2 actors. Note that you may be required to use 2 BT adapters to connect all 6 PS Moves, depending on particular adapter model. In case of multiple BT adapters, you are forced to use Motion in Joy BT drivers as Microsoft drivers do not support multiple adapters.

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Can You give me link to informaton about BT adapters for multiple connection PS3 Move Controller.
Is it:
http://www.amazon.com/gp/product/B002AQSTXM/
ok?

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Yes, TRENDnet TBW-106UB is suitable.

Thank You!