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Navmesh Volume not detecting stairs

As demonstrated in the image below, the navmesh bounds volume does not appear to be detecting my stairs. The bounds volume is scaled appropriately, as to encompass the entire level.

alt text

Product Version: UE 4.8
Tags:
navmesherror.png (1.3 MB)
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asked Jun 30 '15 at 09:39 PM in Using UE4

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Sificvoid
1 1 1 2

avatar image unit23 Oct 02 '15 at 06:34 PM

Similar problem with default ThirdPerson level content

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staurs#.jpg (59.6 kB)
avatar image MieszkoZ STAFF Oct 02 '15 at 07:32 PM

This screenshot doesn't show a bug. Navmesh cutting trough stairs is a result of navmesh being a simplification of walkable space, not a replication. This is to be expected.

avatar image unit23 Oct 02 '15 at 08:49 PM

Well before this, with moving the mesh slightly (less walkable space), the AI was not entering stairs. Though, now it does, but stops close to the end of the upper floor, where there is a small gap in the navmesh (see above image). It is ok now, but a bit weired when not aware that you have to move the navmesh around to get maybe a better result

avatar image MieszkoZ STAFF Oct 02 '15 at 08:51 PM

It's pretty vague what you say. Maybe you just need to tweak navmesh generation properties?

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2 answers: sort voted first

Looks like stair mesh doesn't have a proper collision set. Can you double-check it has identical collision settings to other meshes?

Cheers,

--mieszko

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answered Jul 01 '15 at 08:34 AM

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MieszkoZ STAFF
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avatar image lion032 Oct 02 '15 at 06:55 PM

My guess is that the stair angle is too steep.

avatar image MieszkoZ STAFF Oct 02 '15 at 07:33 PM

If that was the case then we'd see a navmesh edge where navmesh approaches the stairs. Instead it seems it's cutting though, that's why I'm guessing that's a missing navigation collision.

avatar image lion032 Oct 02 '15 at 07:36 PM

Right! It's too late in this part of the world to notice that :P

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Not sure if it's the same cause, but i encountered the same problem. For me the issue was that it didn't have simple collision which seems to be used for the navmesh. It had collision but it was only complex collision! So i simply went into the mesh and changed collision settings from "project default" to "use complex collision as simple"

P.S: i know this post is a few years old but i'll just leave it here if somebody has a similar issue :D

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answered Feb 15 '19 at 03:27 PM

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nonamed46
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