Hello, I am developing a building game. I want to display a green area in the game. This green area means I can put the building. So I used the Nav box for pathfinding. In the edior mode, this green area can be displayed, but the green navigation area for entering the P key in the game is not displayed. Do you have a good idea? Thank you
Well it would require C++, but if you want to display the NavigationMesh you could probably somehow retrieve it from the RecastNavigationSystem and maybe assign it a material.
The more pragmatic solution that is used by every other game would be to spawn a preview building, that follows your cursor and is green when placeable and red if not, depending on your conditions.
Hope this helps you 
Thank you ,this good.