NavNode.IsNull

Returns

bool true if the NavNode has been created empty and has never pointed to any node in the NavMesh, or false otherwise.

Description

Determines whether this NavNode is empty of any information.

A null NavNode is the default value of the struct and represents the absence of a reference to any node. This is distinct from a NavNode that once referenced a real node that has since been removed; in that case NavNode.IsNull still returns false. Use NavWorld.IsValid to check whether a non-null node is currently active in the NavMesh.

using UnityEngine;
using Unity.AI.Navigation.LowLevel;

public class NavNodeIsNullExample : MonoBehaviour
{
    NavNode m_Stored;

    void Update()
    {
        // Default-initialized NavNode values are null until you assign one from a NavWorld query.
        if (m_Stored.IsNull())
        {
            using NavWorld world = NavWorld.GetDefaultWorld();
            NavLocation location = world.MapLocation(transform.position, Vector3.one, 0);
            if (world.IsValid(location))
                m_Stored = location.node;
        }
    }
}