Initiate RayCast From Center of Camera?

Question

Hello,

How would I go about Initiating a ray cast from the center of the screen (camera). Right now I am initiating from the mouses position:

function Update () {

 var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
 var hit : RaycastHit;
 if(Physics.Raycast (ray, hit, 500))
     Debug.DrawLine (ray.origin, hit.point);
     var objectTouching = hit.collider.name;
     print(objectTouching);
     currentObjectOver = hit.collider.gameObject;

Thanks,

Ollie

Answer 1

Best Answer

Answer by Bunny83 · Feb 07, 2011 at 04:28 PM

It's quite easy since that's the "normal" way to raycast:

var cam : Transform = Camera.main.transform;
if(Physics.Raycast (cam.position, cam.forward, hit, 500))

or if you need the Ray use:

var cam : Transform = Camera.main.transform;
var ray = new Ray(cam.position, cam.forward);
var hit : RaycastHit;
if(Physics.Raycast (ray, hit, 500))

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SimpleGiant · Jan 30, 2014 at 02:25 PM 0

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This is not working for me, I am getting this error.

UnityException: You are not allowed to call this function when declaring a variable. $$anonymous$$ove it to the line after without a variable declaration.

is this cod C# or JavaScript? im running Java as main.

Bunny83 · Jan 31, 2014 at 02:58 AM 0

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@SimpleGiant:
This is of course UnityScript (Unity's Javascript dialect) since the question was using it as well. This code works pretty well inside a function of course. You probably used it outside a function where you usually declare your member variables.

I suggest you watch some very basic coding tutorials about scripts and classes. If you don't know that a declaration is and what's executable code you won't get anywhere.

Answer 2

Answer by Simple · Feb 07, 2011 at 04:16 PM

 var ray : Ray = Camera.main.ViewportPointToRay (Vector3(0.5,0.5,0));   
        var hit : RaycastHit;
        Physics.Raycast (ray, hit);

Vector3(0.5,0.5,0) uses x = 0.5 and y = 0.5 because Viewport vectors are normalized(which means they take value from 0 to 1). So, it will be the middle of camera viewport.

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Initiate RayCast From Center of Camera?

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