tap detection on a gameobject in unity

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.

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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.

Answer 3

You need to do several items here

1. you need to raycast the touch to determine if the ball is touched

2. you need to increment the power on the duration of the touch

3. you need to fire the ball and reset the power on release of the touch

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The code example here shows how to handle the rayCast

the code example here should help you with part 2

3 is nice and simple you just need to trigger your launch code an reset on Ended

put them together and you will get something like this

public class ExampleClass : MonoBehaviour {

    void FixedUpdate() {
       for (int i = 0; i < Input.touchCount; ++i) {
           Ray camRay = Camera.main.ScreenPointToRay (Input.GetTouch(i).Position);
           RaycastHit ballHit;
           if(Physics.Raycast (camRay, out ballHit, camRayLength, ballMask))
           {
               if (Input.GetTouch(i).phase == TouchPhase.Stationary) {
                   power += speed + Time.deltaTime;             
               }

               else if (Input.GetTouch(i).phase == TouchPhase.Ended) {
                   LauchBall(power);
                   power = 0;        
               }
           }
        }
    }
}

NOTE:code is for example only it has not been tested and is not complete

this uses the physics update as the trigger you can instead link directly to an objects triggers as suggested by some of the other answers

Answer 4

Take Touch Event using Co-Rouitne will be good for you. If you will not use coroutine, then it constant check for touch event in OnUpdate. Its better to take touch event in co-routine. This is my link in which you can check how to use it.

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http://unitycodestuff.blogspot.in/2017/11/how-to-use-co-routine-for-taking-touch.html