Hello souldwizard7,
Here is a quick answer about what the color means:
Each color represents a type of navmesh data
- Green, Light Blue = Navigatable, where the AIs can navigate normally.
- Gray, Yellow, Brown, Purple = Obstacles, where the AIs would destroy to get through if they can, or they will walk around if the environment damage is damaged.
- Silver, Lighter Grey-Blue = Water, only used for Guard and Wildlife, Creature would be instantly eliminated when falling into water so they won’t pathfind to the area
- Dark Purple, Black = Unreachable, unwalkable areas for the AIs so they consider the area as unreachable places
It is still a bit difficult to explain all the details on this and we are working with the documentation team to make sure we have more info written for the Creators.
Regarding the issue about the navmesh is not working on certain Fortnite props, we have a few bugs on track to make a cleanup pass on it, so stay tuned for the update or you can use some collision box or gray box mesh to make it build properly as a temporary workaround.