How to prevent raycast when clicking 4.6 UI?

Question

I have it so I can click enemies to target them and if the player clicks anything else it clears the target but if I want to then click my spell icon to cast a spell it will detect terrain or whatever is under the UI object and reset my target.

How can I prevent this?

Answer 1

Answer by troien · Nov 02, 2014 at 11:31 AM

You could check for the following to be false before you do your own raycast.

 UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject()

If this value is true, you should be hovering any of your UI elements, if false not.

On a sidenote, If you use a CanvasGroup component to hide your menu, make sure you also uncheck the 'Blocks Raycast' when you hide it. (otherise Unity will tell yo that you are hovering the invisible UI ;)

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richyrich · Nov 02, 2014 at 01:15 PM 0

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@troien - do you happen to know of the link in the scripting guide to this function please? $$anonymous$$y system says that function does not exist. I looked in the scripting pages and could not find it listed either. The best I could find was this (http://docs.unity3d.com/460/Documentation/ScriptReference/EventSystems.EventSystem.html) which is obviously not right

troien · Nov 02, 2014 at 02:56 PM 0

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Nope, I can´t. The Unity scripting reference is not up to date, and does not contain this. However, the autocomplete of visual studio/monodevelop tells me this method exists and this method works for me. Which version of Unity are you currently using? (I'm using 4.6.0b20)

KingRecycle · Nov 02, 2014 at 05:17 PM 3

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This worked.

After a little searching you want to add -1 to check for mouse.

 UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject(-1)

richyrich · Nov 02, 2014 at 05:21 PM 0

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$$anonymous$$y version is 4.5.0f6. Ah, a new feature, all is well - I'd assumed that I'd made some import mistake. I've now found the beta script guide link, but it still does not have the function - but as you say, its not up to date. Thanks for reply :)

itsharshdeep · Jan 14, 2015 at 11:29 AM 0

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Thanks a lot :) It Worked for me

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Answer 2

Answer by Kiwasi · Dec 26, 2014 at 04:33 AM

Also worth noting that you can abandon your own ray casting solution and use the Unity event system with a physics raycaster. You can them implement the various interfaces from UnityEngine.EventsSystem.

Note that the event system is also intended to replace SendMessage.

Edit: Adding a YouTube video, since this question has been asked a few times

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sagiv_bg · May 07, 2016 at 02:39 PM 0

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hi, looks nice but I'm confused, what if i have a Gamemanager that handle a start game click (basicly any key on any spot on the screen). where do i need to implement the interface then (i've tried to implement it on that Game$$anonymous$$anager but no luck, the OnClick function doesnt fire at all). thanks in advanced

Nananaaa · Oct 17, 2016 at 07:47 PM 0

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What a comprehensive answer the youtube video is. Thank you for sharing this!

How to prevent raycast when clicking 4.6 UI?

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