public void setPostureTolerance (float _postureTolerance) {
		if (_postureTolerance >= 0f && _postureTolerance <= 1f) {
			postureTolerance = _postureTolerance;
		} else {
			postureTolerance = 0.5f; // default posture accuracy
		}
		postureAngleTolerance = PApplet.radians(20)*postureTolerance;
	}