ControllerColliderHit.moveLength

Description

Какое расстояние прошел персонаж, пока не столкнулся с коллайдером.

Note that this can is different from what you pass to CharacterController.Move, because all movement is constrained by collisions.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnControllerColliderHit(ControllerColliderHit hit) {
        Debug.Log(hit.moveLength);
    }
}