右足の底の位置の高さを取得します
void LateUpdate()
{
if(animator)
{
Vector3 rightFootT = animator.GetIKPosition(AvatarIKGoal.RightFoot);
Quaternion rightFootQ = animator.GetIKRotation(AvatarIKGoal.RightFoot);
Vector3 rightFootH = new Vector3(0, -animator.rightFeetBottomHeight, 0);
Vector3 pos = rightFootT + rightFootQ * rightFootH;
Debug.Log(pos);
}
}