Android Button With Raycast

Questions & Answers
1

I just wonder if I can get a little help here, I need a few directions on how I will start with making buttons on an android platform with raycast - this is the script I got but how the hell will I make it work? do I just add raycast collider to the 3d text and add this script and it will work or how do I do?

var particle : GameObject;  
function Update () {  
       if (Input.GetButtonDown ("Fire1")) {  
        // Construct a ray from the current mouse coordinates  
        var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);  
        if (Physics.Raycast (ray)) {  
            // Create a particle if hit  
            Instantiate (particle, transform.position, transform.rotation);  
            Application.LoadLevel(0);  
		  
        }  
    }  
}
2

If your making buttons for a mobile platform don’t use raycasts. Use GUI. Or, and Highly recomend it, use Rect.Contains as a means of reaplacing GUI.

Here’s an example of how it would look.

//variables which construct the Rectangle
var Rect = Rect(Screen.width,Screen.height,Screen.width,Screen.height);
var HorizontalPositionx : float;
var VerticalPositiony : float;
var Width : float;
var Height : float;

var custom : GUIStyle;

function Update(){
Rect.y = Screen.height/VerticalPositiony;
Rect.x = Screen.width/HorizontalPositionx;
Rect.height = Screen.height/Height;
Rect.width = Screen.width/Width;
if (Rect.Contains(Input.mousePosition)){
if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began){
 // Create a particle if hit  
            Instantiate (particle, transform.position, transform.rotation);  
            Application.LoadLevel(0);  
    }
}

//you can edit this to show whatever your button is later but for now this just shows where your rect is
function OnGUI(){
GUI.Box(Rect, "Button Rect", custom);
}
3

When programming for mobile devices, i am told that using unity OnGui is very processor intensive (as it has calls every frame) but to use a raycast or rectangle.contains instead.

4

Here’s what I’ve got : (It is in C# but I think it should be easy to convert!)

 void Update() {

if (Input.GetButtonDown (“Melee”)) {
Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
RaycastHit hit;
if (Physics.Raycast(ray, out hit)) {
if (hit.transform == transform){
Application.LoadLevel(0);
}
}
}

}

You need to add a RaycastHit to know that the button was hit!