How to do precise navmesh?

Development World Creation
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1

Hi,
I am a bit new to UE4 and I have a problem with building a navmesh, the generated navmesh is over the surface which makes curved bridge not crossable and my player hover over the ground

221456-capture.png
221456-capture.png1313×697 601 KB

Please help

Thanks in advance

2

hellooo anyone?

3

There is an example of this in ContentExamples->NavMesh Map. I’d start there.