Using Body Tracking if You Have an Extra Frontal Group
Above the traditional Head and Body group, I have an extra Frontal group tagged as a Head and with Face behavior. This is to control the body with that Face behavior and to allow for more head tilt*. But this extra Head tag confused Body Tracking and produced a pronounced judder effect when my puppet moved--looked like she had the caffeine shakes. This was with only Body Tracker and Limb IK armed.
Unarming the extra Face behavior did not fix it. Neither did unchecking Body Tracker's tracked handle of Head--this only nailed the Frontal Head to the background. What fixed it was temporarily removing the Head tag from Frontal. [Other extra Head tags below the actual head group didn't cause issues.]
*As demonstrated by okaysamurai...
