3D tracking device, give it a name plz :)

[WolleWu]

hi guys,

i'd like to build my own 3D tracking device for a bluescreen shot. does anyone know what that stick/cross with those ping pong balls sticking at each end is called? i've seen it a hundred times but i can't say what it's called, except "6-ping-pong-ball-stick-thingy" :D in case anyone knows how to build such a thing (dimensions, material, what to be aware of etc.), let me know. even if your information is very rough it'll definitly be helpful.

thx for your help

Guido

[johannesfleck]

In my opinion the size does not matter, i think its youst there for the tracker to get points and thats it. make it like you like it and its good enough. Just don´t make it to small.