I want to design an island map in Unreal Engine where flat areas can be built upon, while uneven or steep areas cannot be built upon

Development World Creation
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I want to design an island map in Unreal Engine where flat areas can be built upon, while uneven or steep areas cannot be built upon. How to do it.

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How to obtain landscape height? - Development / World Creation - Epic Developer Community Forums (unrealengine.com)

I think using line trace is a good way to achieve that.