Recording mouse position is acting weird

Hi! I created a small script that is supposed to move a GameObject to the position of the mouse's X and Y value whenever the left mouse button is held down. However, when I hold my mouse down in the game view in Unity the X and Y values go crazy, shooting to hundreds.

The GameObject's original values are the following: X: -3.89, Y: 3.18, Z: 0

When I click on the screen the values always go somewhere between 100-700, which makes the game unplayable as it shoots the GameObject way out of bounds of the screen. The script is linked to the GameObject I want to move.

Here's my simple script:

Code (CSharp):

1. void Update () {
2.      
3.         float mouseX = Input.mousePosition.x;
4.         float mouseY = Input.mousePosition.y;
5.  
6.         if (Input.GetMouseButton(0)) {
7.             transform.position = new Vector2(mouseX, mouseY);
8.         }
9.     }

 

Input.mousePosition gives values in screen (pixel) coordinates.

You can use some of these to convert into world coordinates:
http://docs.unity3d.com/ScriptReference/Camera.ScreenToWorldPoint.html
http://docs.unity3d.com/ScriptReference/Camera.ScreenPointToRay.html

 

http://docs.unity3d.com/ScriptReference/Input-mousePosition.html

Edit: Too slow

 

Thanks for the quick replies guys! I'm a total newbie so I'm not sure what I'm doing, but I ran into a problem with the script.

Code (CSharp):

1. void Update () {
2.         Vector3 springPlace = camera.ScreenToWorldPoint
3.             (new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0));
4.  
5.         if(Input.GetMouseButton(0)) {
6.                 transform.position = new Vector3(springPlace.x, springPlace.y, 0);
7.             }
8.         }
9.     }

I get an error report where Unity tells me that there is no camera attached to the GameObject I'm trying to control, but adding a camera to it wouldn't be a feasible option in terms of the game. Putting the script on the camera is not working very well.

What should I do? Should I refer to the GameObject in the code after putting the script on the main camera?

 

Ok there are some basic principals here your going to need to get your head around. If your referencing your camera your script either needs to be attached to the camera or store or find a reference to it. This goes for any of the entities in your game. If want to hit the player you need to find or store a reference to the object , or the specific script.

http://answers.unity3d.com/questions/15801/finding-cameras.html

http://docs.unity3d.com/ScriptReference/GameObject.Find.html

 

I was a bit too quick to post the first reply as I noticed some pretty big logical mistakes in the script after sending it out! Anyway, I have now attached the script to the camera and ordered the script to find the GameObject I want to move. Now the position of the GameObject updates once, not to the position of my mouse and then it stops there, not responding to any further mouse clicks/movements.

Code (CSharp):

1. void Update () {
2.  
3.         springer = GameObject.Find("springControl");
4.  
5.         Vector3 springPlace = camera.ScreenToWorldPoint
6.             (new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0));
7.  
8.         if(Input.GetMouseButton(0)) {
9.                 springer.transform.position = new Vector3(springPlace.x, springPlace.y, 0);
10.  
11.             }
12.  
13.         }

 

From the docs: "The z position is in world units from the camera."

So, it returns the world point that is z distance from the camera.