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Using RayCast to Get Mouse Input

I am really frustrated, so much so that I am going to ask this last question and walk away from the computer and wait. I'm trying to use raycasts to get the current mouse position at a click. For now, I'm instantiating an object as a debugger. Here's my code:

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

Now, when I play the game, when I click, it instantiates the object right at the camera's position. What am I doing wrong? Any and all help appreciated.

Elliot Bonneville

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asked Mar 22, 2010 at 01:09 AM

e.bonneville gravatar image

e.bonneville
6.2k 252 217 264

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1 answer: sort voted first

You say to instantiate at transform.position, which is the camera's position (I'm assuming your script is attached to the camera). You need to create a RaycastHit variable and use the position where the raycast actually hits.

var hit : RaycastHit;
if (Physics.Raycast (ray, hit)) {
// Create a particle if hit
Instantiate (particle, hit.point, transform.rotation);

That will still use the camera's rotation; probably you want to use Quaternion.identity instead.

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answered Mar 22, 2010 at 01:45 AM

Eric5h5 gravatar image

Eric5h5
107k 51 180 648

Thanks. I spent all night on that!

Mar 22, 2010 at 06:52 PM e.bonneville

Would give 20 votes... If I could!

Mar 22, 2010 at 06:52 PM e.bonneville

come on people! upvote it so it gets to 20!

Oct 24, 2011 at 11:49 PM Jibidiah

Wouldn't you say Eric5h5 has enough karma as it is? This is a pretty simple answer! I never get 20 upvotes for basic tutorials... T.T

Oct 24, 2011 at 11:52 PM syclamoth

I don't think that "having enough karma" is a good reason for not upvoting an answer if it deserves it. Not that this one particularly deserves it; it already has more than enough votes for what it is. Also, I'd discourage upvoting an answer as some sort of popularity contest. Just stick to upvoting answers if you find them helpful and don't take any other factors into consideration.

Oct 26, 2011 at 02:42 AM Eric5h5
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asked: Mar 22, 2010 at 01:09 AM

Seen: 28318 times

Last Updated: Feb 14, 2013 at 03:05 PM