Navmesh generation with weights

[yn97]

Would you help me with this?
I need to pass a vector3f point and if it is not traversable then returns the nearest position to that point…

How can I find nearest traversable position using Navmesh Pathfinding?

how can I find nearest traversable position using Navmesh Pathfinding? I need to move the character to a traversable position when it gets off the vehicle… nearest cell means it returns the nearest position in connected islands?