Animator.leftFeetBottomHeight

Получить левую ногу нижней высоты.

using UnityEngine;

public class Example : MonoBehaviour
{
    Animator animator;

    void Start()
    {
        animator = GetComponent<Animator>();
    }

    void LateUpdate()
    {
        if (animator)
        {
            Vector3 leftFootT = animator.GetIKPosition(AvatarIKGoal.LeftFoot);
            Quaternion leftFootQ = animator.GetIKRotation(AvatarIKGoal.LeftFoot);

            Vector3 leftFootH = new Vector3(0, -animator.leftFeetBottomHeight, 0);

            Vector3 pos = leftFootT + leftFootQ * leftFootH;
            Debug.Log(pos);
        }
    }
}