Extremely poor Transform.SetParent performance

Hi guys,

I'm\finding I'm getting large CPU spikes when I use setParent or parent.

I noticed this issue was mentioned here:
re: http://forum.unity3d.com/threads/extremely-poor-transform-setparent-performance.406606/

@Joachim_Ante mentioned that this was improved in b23. I just installed 5.4.1f1 however and the problem for me still exists. Does this version contain the fix?

This occurs when I parent a large heirarchy to a small one, but not really when I parent a small one to a large one.

My childHierarchy is about 5 layers deep with several children per layer. parentHeirarchy can be any size, so it seems that the problem occurs when reparenting a large heirarchy, rather than when reparenting INTO a heirarchy if that makes sense.

Is there a "fix" for this? or perhaps another method? At the moment it's a showstopper for me.

Thanks in advance
Lachlan

 

out of curiosity; having done the research, found a recent thread with active unity dev participation, you've opened a new thread... because?

 

I'm unable to participate in any Beta threads. This issue exists in the latest final release, and according to fixes issued in 5.3b23, shouldn't.

 

5.4 beta forums are closed!

 

... well... good points all round...

fyi, you didn't tag the dev into this thread, you put an @ and then linked his profile into the thread (if you're typing you seem to have to give it a second to recognise what you're doing).

@Joachim_Ante should ping a notification to the person

 

nice, thanks! Hopefully he'll get a chance to respond here. Beetlejuice beetlejuice beetlejuice!

 

OK so this is not a "solution" per se, but I was able to get better results by disabling the colliders prior to performing the parent.

eg:

Code (JavaScript):

1. for (var c: Collider in obj.GetComponentsInChildren(Collider)) {
2.      c.enabled = false;
3. }

I'd still consider this an issue because recursively disabling colliders like this introduces its own set of potential issues. Still open to other suggestions too!

Cheers
Lachlan