我正在尝试使用 Unity 制作 FPS 足球游戏，但我的脚本不起作用

Question

So, I am trying to create a soccer game from scratch... all I have done until now, is setting up the ball. This is how I want it to work: When the player collides with the ball, the ball jumps forward a bit. If you start running the ball will be pushed further away.

Now, here is my script for the ball (I am using the standard FPSController as character):

 using UnityEngine;
 using System.Collections;

 public class BallController : MonoBehaviour {

     private Rigidbody rb;

     public GameObject character;
     public float moveSpeed = 1000;
     public float shootSpeed = 2000;

     bool isTurnedUp = false;
     bool isTurnedDown = false;
     bool done = false;

     // Use this for initialization
     void Start () {
         rb = GetComponent<Rigidbody>();

     }

     // Update is called once per frame
     void FixedUpdate () {

         //Debug.Log(isTurnedUp + ", " + isTurnedDown);

         switch (character.GetComponent<UnityStandardAssets.Characters.FirstPerson.FirstPersonController>().m_IsWalking)
         {
             case true:
                 if (isTurnedUp == false)
                 {
                     moveSpeed = moveSpeed / 1.4f;
                     isTurnedUp = true;
                     isTurnedDown = false;
                 }
                 break;

             case false:
                 if (isTurnedDown == false)
                 {
                     moveSpeed = moveSpeed * 1.4f;
                     isTurnedDown = true;
                     isTurnedUp = false;
                 }
                 break;
         }
     }

     void Update()
     {

         if (Input.GetMouseButtonDown(0))
         {     
             if (Vector3.Distance(gameObject.transform.position, character.transform.position) <= 5)
             {
                 float distance = Vector3.Distance(gameObject.transform.position, character.transform.position);
             }
         }

     }


     void OnCollisionEnter(Collision collision) {

         FixedUpdate();
         if (done == false) {
             rb.AddForce(Vector3.forward * moveSpeed, ForceMode.Impulse);
             done = true;
         }
         else {

             done = false;

         }      
     }     

     //other
     void OnDrawGizmosSelected()
     {
         Gizmos.color = Color.yellow;
         Gizmos.DrawWireSphere(transform.position, 2);
     }
 }

My problem is that the ball doesn't behave how I want it... it feels like it's about luck if the ball will jump forward when I touch it. Can someone tell me what I did wrong?

Answer 1

Inside of OnCollisionEnter you need to ensure the ball can only be kicked by the player. You can check whether or not the player has collided with the ball by checking the name or tag of the collision. The following example uses the name and assumes your player GameObject is named "Player".

Remove the done flag since this will only allow the player to kick the ball every other time they collide, and remove the FixedUpdate() call since FixedUpdate() is already called automatically every physics calculation.

Finally, if you want to kick the ball away from the player, then you need to calculate the direction away from the collision point instead of using Vector3.forward as seen below.

void OnCollisionEnter(Collision collision)
{
    if(collision.gameObject.name == "Player")
    {
        Vector3 direction = (collision.transform.position - transform.position).normalized;
        rb.AddForce(-direction * moveSpeed, ForceMode.Impulse);
    }
}