STEM, Inverse Kinematics, and Accuracy
This update addresses questions we've been receiving regarding this weekend's STEM update and video from Sixense.
The STEM update video from update #13 on Oct. 4 2013 clearly illustrates the difficulty of 1:1 motion tracking using the standard STEM configuration consisting of a single base station and only 5 trackers. In short, the problem is that with so few trackers, Inverse Kinematics (IK) must be used to calculate a best-guess pose for the player. Thus, rather than having an accurate in-game pose that is identical to the pose of the real-world player, you are getting a calculated guess of the pose of the real-world player. With the limit of only 5 trackers imposed by the standard STEM configuration, these errors will always remain.
Below are several screen-shots from the STEM update video that clearly illustrate the IK problem: