CanvasRenderer.OnTransformChanged

can anyone explain what does CanvasRenderer.OnTransformChanged mean?



i'm on 5.0.1f1 and afraid to upgrade to newer version.
is this a bug or has been fixed on the newer version?

 

Anytime you change the position of something in a UI, it has to adjust the Rect Transforms for any of its children so an event is thrown. I believe that's it for.

 

I do have a screen space - camera canvas as a child of a moving camera though.
did you get that from the docs or did you know any writing about this?

 

I didn't get it from docs, just my own observations. I haven't tested it with a moving camera, but I know if I move a parent of a rect, I will see that call, and the more children I have, the more overhead it seems to create. I imagine if your moving your canvas around with a camera its probably calling that all the way down the chain. I'm not really sure what the solution is as far as making it more efficient, I saw somewhere in the forums about using 'anchoredPosition' on the rect instead of position but I didn't get any noticeable performance benefit from that.

 

Hmm.. Looks like I've got some restructuring to do.
Something like this should be in the docs, right? Like, UI best practice or something.

Thank you then.

 

I'm also getting a lot of overhead from this function because I have a long scroll list with quite a lot of elements, did you figure out a way to make it less heavy ?

Maybe removing layout groups or content size fitters would help ?

 

We've got quite different problem.
In my case, I've just got to freeze my canvas' (and it's parent's) position.

Could you try to limit the showed listed items and hide (deactivate) the rest?