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Any update on DetourCrowds (or similar system) for navmeshes?

I've been working on a top down camera game with multiple character selection where the characters move using the navmesh feature. It works well unless multiple characters try to move at the same time, when it breaks down since each character does not consider the movement and position of the others. I found a similar question here:


Where the answerer ue4-archive suggests that there would be a feature in release which solves this problem. I've tried to find information on this both online and in the source / docs but to no avail. Is this feature available now? Was it maybe scrapped before release? or is it still being finalized?

I could try to some kind of implementation myself, but if this exists / is on its way, I'd obviously rather wait and use it instead :)

Best regards, Temaran

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asked May 10 '14 at 02:37 AM in C++ Programming

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avatar image Temaran May 13 '14 at 02:48 AM

I decided to grep around a bit more in the sources and found some very promising stuff under Engine/Source/ThirdParty/Recast

I've only begun looking at the samples, but it definitely seems like this is the stuff! Has anyone tried using this yet? I would love any insights :)

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There already is simple RVO avoidance implemented in engine, available for all actors using CharacterMovementComponent. To use it, set bUseRVOAvoidance flag to true in pawn's constructor (turning it on after components are initialized is bugged right now).

You can adjust avoidance details with AvoidanceWeight, SetAvoidanceGroup(), SetGroupsToAvoid() and SetGroupsToIgnore() - where groups are used as set of flags (e.g. my group = "team 1, heavy", avoid = "team1, team2", ignore = "cloaked") and basically agent A will try to avoid B when any flags of B.group is on A.avoid mask and none of B.group is on A.ignore. In most cases you don't need to touch it and it will just work with all agents avoiding each other.

Only downside is, that avoidance doesn't care about underlying navmesh and you can end up with AI agents getting pushed of cliffs, etc.

Detour crowds integration is currently being finalized and should be available soon (probably in 4.3 release).

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answered May 14 '14 at 02:28 PM

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IceWraith STAFF
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avatar image Belven Jun 24 '14 at 09:39 PM

Cool, can't wait to try it out, Epic makes everything... well epic really :D

avatar image Twinfun Jul 11 '14 at 01:10 AM

I could have sworn I saw the Detour crowds AI "card" on the Trello roadmap, but it isn't there anymore.

My memory aside, I don't see any mention of Detour crowds (or any pathfinding related) updates in the 4.3 build preview notes.

I'm a pretty patient person, so I'm just looking for an update on the status of this.


avatar image kodmistrz Jul 12 '14 at 08:34 AM

Me too! I'm waiting for DetourCrowds.

avatar image Twinfun Jul 13 '14 at 05:09 PM


That's great and all, just wish there was a little more info. Guess I'll have to try and snoop around the code.

avatar image IceWraith STAFF Jul 14 '14 at 07:26 AM

Weird, I was writing about crowd stuff for update notes, but for some reason it's not there. Anyway, code should be available to use.

In most cases all you need to do is replacing PathFollowingComponent's class to CrowdFollowingComponent. Unfortunatelly, it can't be easily done for blueprint only project (although from what I've heard, blueprint team is working on feature to replace native components).

(can't really paste code sample here, no idea how to make it display triangle brackets correctly :D )

Additional info in AIModule/Classes/Navigation/CrowdManager.h and AIModule/Classes/Navigation/CrowdFollowingComponent.h.

avatar image Twinfun Jul 14 '14 at 05:40 PM

Thanks for the update!

EDIT: By the way, I'm sure nobody would mind a code example even if it wasn't well formatted. The code comments seem clear, though.

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