tap detection on a gameobject in unity [duplicate]

Question

i'm currently making a soccer game.

In this mini-game, when the player touch the ball, it adds force, and the goal is to make the higher score.

So i wrote:

 void Update()
{
    if(Input.touchCount == 1 && Input.GetTouch(0).phase== TouchPhase.Began)
      {
       AddForce, and playsound ect...
      }

}

With this, when i touch anywhere on the screen, it adds force, but i just want to add force when i touch my gameobject (the ball).

How can i do that?

Thanks! :)

Answer 1

With this, when i touch anywhere on the screen, it adds force, but i just want to add force when i touch my gameobject (the ball).

To detect tap on a particular GameObject, you have to use Raycast to detect click on that soccer ball. Just make sure that a collider(eg Sphere Collider) is attached to it.

void Update()
{
    if ((Input.touchCount > 0) && (Input.GetTouch(0).phase == TouchPhase.Began))
    {
        Ray raycast = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
        RaycastHit raycastHit;
        if (Physics.Raycast(raycast, out raycastHit))
        {
            Debug.Log("Something Hit");
            if (raycastHit.collider.name == "Soccer")
            {
                Debug.Log("Soccer Ball clicked");
            }

            //OR with Tag

            if (raycastHit.collider.CompareTag("SoccerTag"))
            {
                Debug.Log("Soccer Ball clicked");
            }
        }
    }
}

Answer 2

Use OnMouseDown() in your script. Here is an example:

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnMouseDown() {
        Application.LoadLevel("SomeLevel");
    }
}

P.S : remove that previous code from Update() method.

---

EDIT : Alternative code for mobile devices

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class OnTouchDown : MonoBehaviour
{
    void Update () {
        // Code for OnMouseDown in the iPhone. Unquote to test.
        RaycastHit hit = new RaycastHit();
        for (int i = 0; i < Input.touchCount; ++i) {
            if (Input.GetTouch(i).phase.Equals(TouchPhase.Began)) {
            // Construct a ray from the current touch coordinates
            Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(i).position);
            if (Physics.Raycast(ray, out hit)) {
                hit.transform.gameObject.SendMessage("OnMouseDown");
              }
           }
       }
    }
}

Attach the above script to any active gameObject in the scene and OnMouseDown() will work for mobile devices as well.