CharacterController.isGrounded

public bool isGrounded ;

説明

CharacterController が最新の移動中に地面に接地しているかどうかの判断

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Update() {
        CharacterController controller = GetComponent<CharacterController>();
        if (controller.isGrounded)
            print("We are grounded");
        
    }
}