# Touchscreen scripting help
**URL:** https://discussions.unity.com/t/touchscreen-scripting-help/498832
**Category:** Scripting
**Tags:** Scripting
**Created:** [March 2, 2013, 10:06am UTC](https://discussions.unity.com/t/touchscreen-scripting-help/498832 "2013-03-02T10:06:38Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@ZIN](https://discussions.unity.com/u/ZIN)
#### Post date: [March 2, 2013, 10:06am UTC](https://discussions.unity.com/t/touchscreen-scripting-help/498832/1 "2013-03-02T10:06:38Z")
Hi everyone,
I’m trying desperately to get 2 game objects to act as buttons in an app menu but even with the reference material I have found I can’t seem to find or understand a simple touch the screen to press a button example. I know it is using raycasting.
One button it to load a level which is the main app
The other is weblink.
If anyone can help that would be fantastic.
Until then I will just write and test until I hopefully figure it out 😵💫
---
### Author:  [@TheRaider](https://discussions.unity.com/u/TheRaider)
#### Post date: [March 2, 2013, 10:35am UTC](https://discussions.unity.com/t/touchscreen-scripting-help/498832/2 "2013-03-02T10:35:29Z")
```auto
if (Input.GetMouseButtonDown(0))
{
//empty RaycastHit object which raycast puts the hit details into
var hit : RaycastHit;
//ray shooting out of the camera from where the mouse is
var ray : Ray = cameraInterface.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, hit))
{
//check hit against name, tag, or however you are checking
}
}
```
---
### Author:  [@ZIN](https://discussions.unity.com/u/ZIN)
#### Post date: [March 2, 2013, 8:43pm UTC](https://discussions.unity.com/t/touchscreen-scripting-help/498832/3 "2013-03-02T20:43:49Z")
I apologise i’m still a programming newbie.
I’m getting BCE0005 errors over Unknown Identifiers for (LevelData, cameraInterface) so my guess is that I was supposed to identify them before hand.
I’m doing something wrong I just don’t know where.
---
### Author:  [@TheRaider](https://discussions.unity.com/u/TheRaider)
#### Post date: [March 2, 2013, 9:14pm UTC](https://discussions.unity.com/t/touchscreen-scripting-help/498832/4 "2013-03-02T21:14:42Z")
The levelData part wasn’t needed, i took it from my code. I had that there to make sure the game could only play at certain times.
at the top of the script you will need to define a camera like var cameraInterface : Camera; and then attach it in the editor.
This script isn’t finished, you need to do //check hit against name, tag, or however you are checking \<— that part I just gave the raytrace code.