Instantiate an object the same position as the Touch.Begain???

Hi,

I developing on IOS unity pro, and I have problem with instantiating an gameObject at the same postion when I have my fingure at the screen, I tried everything it does not really work the sample code is:


if(Input.touchCount ==1){

touch_n1 = Input.GetTouch(0);

if (touch_n1.phase == TouchPhase.Began)
{

I nstantiate(carPrefap, touch.position , Quaternion.identity);


}

The result of that the GameObject is instantiated somewere else which is far a way from the touch position? Why? any help please???

 

touch.position is Vector2 instance. It's in Screen coordinates. You should convert it to value in World coordinates.
Check out http://unity3d.com/support/documentation/ScriptReference/Camera.ScreenToWorldPoint.html .

 

Yah but to use : Vector3 p = camera.ScreenToWorldPoint(new Vector3(100, 100, camera.nearClipPlane));

I need to have vector3 in the param of "ScreenToWorldPoint" function while the touch.positon is vector2, how to solve this ???

 

http://unity3d.com/support/documentation/ScriptReference/Vector2-operator_Vector3.html

Just pass the Vector2 instance, the z value will be set to zero.

 

I have already done that, but still the object is not instantiated at the same position as the touch position, it drives me crazy sorry to say that ???

 

if (touch_n1.phase == TouchPhase.Began)
{
//Debug.Log("Begain excuted !!!");

//if(createItem){

Vector3 p = camera.ScreenToWorldPoint(touch_n1.position);


Instantiate(carPrefap, p , Quaternion.identity);
}

Shouldn't that do the work???

 

Are you taking the position of your camera into account?

var p : Vector3 = Camera.main.ScreenToWorldPoint (new Vector3 (pointerPosition.x,pointerPosition.y,-(Camera.main.transform.position.z + Gun.transform.position.z)));
var delta : Vector3 = p - Gun.transform.position;

Here I'm calculating a vector so I can determine the angle relative to my cannon, but I would think you would have to use the camera Z.

Hope this helps.

 

Johnny Photon's example should work, the camera should actually be a variable.

Code (csharp):

1.  
2. var cam : Camera; // the camera in inspector if not the main camera
3.  
4. function Start () { //or do this if is main camera
5. var cam = Camera.main.camera; //the .camera may not be needed
6. }
7. function Update () {
8. if (touch_n1.phase == TouchPhase.Began) {
9. if(createItem){
10. Vector3 p = cam.ScreenToWorldPoint(touch_n1.position);
11. Instantiate(carPrefap, p , Quaternion.identity);
12. }
13. }
14. }
15.  

Or if you're using the main camera then use johnny's example.

 

HI login4donald I tried your solution but it did not work ... and johnny's example I could not figure out " Gun.transform.position", because all I have is Camera in the scene which the script is attached too, and the cube which I want to ray cast to from the camera point, all I need is to get the position and instantiating prefab but is like it never works no matter what I do or change !!! and I'm about to give up!!! So I hope there is concret solution or script that solves the problem.

 

I should have just edited it. I thought you would just drop the gun position.
I haven't tried this on a device but it works with the mouse in the editor and creates a cube prefab any time you click on the screen.

Code (csharp):

1. #pragma strict
2.  
3. private static var useMouse : boolean;
4. static var pointerPosition : Vector2;
5. var cubePreFab : GameObject;
6.  
7.  
8. function Start () {
9. if(Application.isEditor || Application.isWebPlayer) useMouse = true;
10. }
11.  
12. function Update () {
13.  
14. var touch : Touch;
15.  
16.  
17.    
18. // get cursor position
19.     if(useMouse) pointerPosition = Input.mousePosition;
20.     else
21.     {
22.         if (Input.touchCount > 0)
23.         {
24.         touch = Input.touches[0];
25.         if(touch.phase == TouchPhase.Began || touch.phase == TouchPhase.Moved)
26.             pointerPosition = touch.position;
27.         }
28.     }
29.    
30. // see if we have an input event   
31.     if ((Input.GetButtonDown("Fire1")  useMouse))  
32.     {
33.         CreateObject();
34.     }
35.     else if (Input.touchCount > 0  touch.phase == TouchPhase.Ended)
36.     {
37.         CreateObject();
38.     }
39. }
40.  
41. function CreateObject()
42. {
43.     var p : Vector3 = Camera.main.ScreenToWorldPoint (new Vector3 (pointerPosition.x,pointerPosition.y,-Camera.main.transform.position.z));
44.     Instantiate(cubePreFab, p , Quaternion.identity);
45. }

You only need to use the camera position Z.
Hope this helps.

 

Hey guys I have managed it out with johnny's way, johnny you rock man, thank you very much.

 

You are welcome. Glad I could help!