User Manual/3. Attaching the Hardware to the performer’s body

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At this point all the system is virtually working. But in order to actually do a real motion capture all the sensors have to be attached to the performer’s body. The quality of this attachment will influence the quality of the capture. We assume you have gone through the previous chapters: You have your sensor fixings ready, and you took all the possible precautions when testing your components, then we can start placing them on your performer’s body.

Part of a basic fixing system for the torso, made with elastic straps and velcro

Where to place the sensors[edit]

In this guide we will be explaining how to capture with the default biped configuration. Many other setups are possible, but it requires tweaking the configurations files.

The picture on this page shows the position and numbering of all the sensors in the body. One common misconception is that sensors should be placed on the joints, that’s not true for this kind of motion capture. Sensors should be placed in the middle of the limb or part that are meant to capture. In the middle means that they should be placed in a manner that most accurately follows the theoretical bone movements. In practice that point is usually where the layers of flesh between the sensor and the physical bone are more thin.

Attaching Hub and SBC[edit]

The lumbar zone is one of the best places to attach the Hub and SBC. They will receive energy from the powerbank, which is somewhat heavy, so you have two options:

  • Create a fixing system that holds everything in there, in a way that’s comfortable for the performer.
  • Create a lighter rig, and put the powerbank on the performer’s pocket.

Connecting it all together[edit]

The Hub-SBC wiring and boot procedure is described the previous chapter.

Once everything is fixed it’s time to connect it using the RJ-12 cables. The default biped suit should follow the scheme below.

Default biped configuration

Keep in mind that cables from the Hub should go to the IN --> connector on the K-Ceptor. Cables exiting a K-Ceptor should go to it’s “child” through the OUT --> connector, and enter the child through its IN --> connector.

If a led on a connected K-Ceptor is off, you probably got it connected backwards.