Optitrack Motion Capture & Motion-Builder

For 4 days, i had the opportunity to present our motion-capture system at the filmakademy Baden-Wuerttemberg. There was great interest from different departements and in the future there will be more mocap stuff here.

It took us about 3 hours to setup the motion-capture system, callibrate it and make it ready for takeoff. I have to admit, that we were doing our job lazy. We had a special travers construction in the form of a rectangle, where we attached the mocap-cameras. This gave as more felxibility as we had no tripods and were still mobile on set. The only drawback was introduced when someone accidently hit the travers, then it started oscillating, then we had to wait for a couple of minutes.

1-Day Tango-Dancers and Students:

We were looking for different motions to capture to see how robust the optitrack mocap system is, how much occlusion it tolerates. When dancing Tango, it can be problematic, when the pair is getting too close to each other, especially when  one partners hand is on the other partners body, hand-markers and body-markers are confusing the mocap-system. After knowing a choreography, you can slightly change the marker-positions to avoid this type of errors. (We did this with the markers on the womans spine, as the mens hand was always close to other markers on her spine)

1-Day Balett-Dancers Capturing + Skinning

Here a Balett Dancer was doing her performance, even the mocap-suite was a not fitting exactly, the results were quite fine.

Result without cleaning:

Learned:

-) Especially when doing marker-based mocap, you have to be carefull with setting markers on the feets of female actors, as most of them have small feet markers can occlude other markers. So using a more sophisticated marker setup like the “Hinge” gave us everytime problems with female performers.

-) Don’t use Reflecting Gaffer Tape

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