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How can a Nav Mesh connect through doorways?

I have a "box" object scaled to be a large plateau. On this box I have placed some "house" objects that have no floor. The resulting navmesh does not connect the interior of the "house" to the exterior. How can I get the nav mesh to work through these "doorways"?

Navmesh not going into buildings

interior shot

Product Version: UE 4.22
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capture.png (1.9 MB)
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asked Apr 21 '19 at 01:13 AM in Using UE4

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Jooobei
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Problem was that these were imported .fbx without including custom physics colliders. This means that the collider was the bounding box and there was no opening on it.

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answered Apr 21 '19 at 02:58 PM

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Jooobei
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