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How to implement custom NavMesh

I need a custom navmesh to let ai navigate on walls and such, which is not possible with a Recast navmesh. According to the answer of this question it would be best to make a class deriving from ANavigationData. But I can't find any info on how to implement this. How would I do this? It's not clear to me how unreal navigation works under the hood. Are there any examples I missed? Would I have to write a new pathfinding algorithm from scratch when I use a custom navmesh or could I still use Unreals built-in pathfinding?

Product Version: UE 4.14
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asked Dec 18 '16 at 03:50 PM in C++ Programming

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JRB1994
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