Fix a GUI's position relative to a 3D object

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Hello guys,

probably t$$anonymous$$s is not$$anonymous$$ng new to you but for me its becoming a pain. How can I convert a 3D position of an object in the world to a 2D position in the screen so that I can place a GUI there that is always "covering" the object?

Thanks!

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Answer by Paulius-Liekis · Aug 20, 2012 at 12:02 PM

Camera class contains a bunch of methods for that (World-to-Screen, Screen-to-World and similar). Just take your active camera and convert coordicates using those functions.

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NeMewSys · Aug 20, 2012 at 01:17 PM 0

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But my gameObject is not a camera, is another object, how can I get my "self" coordinates xyz into screen xy? Or do I need to locate my Main Camera with GetComponent() to do this?

Paulius-Liekis · Aug 20, 2012 at 02:41 PM 0

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If you have just one camera in your scene, then you can simply do Camera.main and it will return you the main camera in the scene.

NeMewSys · Aug 20, 2012 at 05:17 PM 0

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It gives me this error "NullReferenceException: Object reference not set to an instance of an object AttachedWindow.GetObject2DCoordinates () (at Assets/MyCustomScripts/GUI/AttachedWindow.js:14) AttachedWindow.Configure (System.String title, System.Single[] sz, UnityEngine.GameObject obj) (at Assets/MyCustomScripts/GUI/AttachedWindow.js:8) OnOffHavac.SwitchParticles () (at Assets/MyCustomScripts/OnOffObjects/Havac/OnOffHavac.js:33) OnOffHavac.OnMouseUpAsButton () (at Assets/MyCustomScripts/OnOffObjects/Havac/OnOffHavac.js:20) UnityEngine.SendMouseEvents:DoSendMouseEvents()"

For the line of code:

Camera.main.WorldToScreenPoint(_myObj.transform.position); Looks like Camera.main is returning null, but my only camera is tagged as MainCamera so it shouldn't...

Edit: Actually it isn't returning null, Camera.main return a UnityEngine.Camera.

EDIT2: The error is not related, it was _myObj that was missing. All works now.

Thanks!

Fix a GUI's position relative to a 3D object

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