Animator.rightFeetBottomHeight

Получите правую высоту нижней ноги.

using UnityEngine;

public class Example : MonoBehaviour
{
    Animator animator;

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

    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);
        }
    }
}