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Question by Cyberdogs7 · Sep 28, 2012 at 07:39 PM · unity4betagetcomponentsinchildren

GetComponentsInChildren not working

I have a small section of code that calculates a combined bounding box for a set of meshes.

 Bounds allBounds = new Bounds(Vector3.zero,Vector3.zero);
 Renderer[] theRenders = thePart.GetComponentsInChildren<Renderer>();

 foreach(Renderer theRender in theRenders){
     allBounds.Encapsulate(theRender.bounds);    
 }

This code works 99% of the time, but sometimes the GetComponetsInChildren call returns zero found objects. However, checking the same object (with no changes) the next frame, it will work.

Any ideas on what could be causing this? I only caught this ass it's part of my UI, I can't imagine the other bugs it could cause in my other code.

This code also runs flawlessly under unity 3.5.6, it was only after updating to unity 4 that the problem showed up.

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avatar image DaveA · Sep 28, 2012 at 07:40 PM 0
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Curious are you calling it in OnGUI?

avatar image Cyberdogs7 · Sep 28, 2012 at 07:53 PM 0
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No, it's being called in an Update loop. It is triggered when you hover over a UI item (using NGUI)

I resolved this for now by reverting back to unity 3.5, but I wanted to present this in case it's a bug.

avatar image whydoidoit · Sep 28, 2012 at 08:16 PM 0
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I'd submit it as a bug report.

avatar image Cyberdogs7 · Sep 28, 2012 at 08:25 PM 0
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Will do. Have to get around to replicating it in an example. I don't think they want a 15GB project :/

avatar image Jessespike · Sep 28, 2012 at 09:31 PM 1
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I would never put a GetComponentsInChildren inside an update loop. Can you not cache the array beforehand ins$$anonymous$$d? If not, you could double check the list, if it's null, redo the search.

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