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[4.9.1] Cannot Retrieve Bounds Of Default Actor Object

Hey Epic,

I'm having a problem retrieving the bounds of a given Actor before spawning it. My current issue is I am spawning Pawn's within a given radius and the ground is not guaranteed to be even. Due to this, some get spawned in the ground and I'm working on a solution to make them appear above it and not end up getting stuck.

In order to do this, I'm doing a multi-trace of points within the area that the Pawn will spawn and picking the one with the highest height. However, to drive the box extent of the trace, I want the bounds of the Actor before spawning.

When attempting to pull this from GetDefaultObject(), any attempt to get the bounds on either Actor or Component level returns 0, this would be extremely helpful if this could be available but if not, how would I get the bounds effectively before spawning a given Actor?


Product Version: UE 4.9
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asked Sep 22 '15 at 08:16 PM in Bug Reports

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MC Stryker
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Hey MC Stryker-

The actor has to have been spawned and exist in order for its bounds to exist. A possible suggestion for what you're trying to do would be to have a dummy actor hidden/offscreen that you can get the bounds of and then use that for your trace before spawning the real actor.


Doug Wilson

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answered Sep 22 '15 at 08:54 PM

avatar image MC Stryker Sep 23 '15 at 07:30 PM

Gotcha, I was thinking about that as an alternative. Let me ask, do you think its possible something could be added to the engine to pre-calculate this based off of the structure of the Actor or at least for in this case, a Skeletal Mesh?

It may not be able to query that ahead of time since it needs all the mesh data loaded into memory to determine a bounds but I was curious. Thanks Doug!

avatar image MC Stryker Sep 23 '15 at 07:32 PM

Oh Doug, also unrelated but I posted this a little back and haven't gotten a response in case you get a moment, thanks again.


avatar image Doug E ♦♦ STAFF Sep 24 '15 at 03:44 PM

I can enter a feature request to have the pre-calculated bases added to the engine for additional functionality.

avatar image MC Stryker Oct 12 '15 at 06:52 PM

Thanks Doug! That would be awesome.

Apologies on the delay.... was moving from LA to Irvine and just starting to get settled and setup. Thanks a ton buddy and hope all is well!

avatar image Griffork_Opaque Nov 10 '15 at 11:45 PM
  • for this!

avatar image derm Nov 13 '15 at 07:27 AM

Ooo yes, having it pre-calculated so we don't have to have hidden actors would be fantastic! Is this something that could be potentially coming soon?

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