NavMesh.AllAreas

Description

Area mask constant that includes all NavMesh areas.

Use the mask in query functions, such as NavMesh.Raycast, to indicate that all NavMesh area types are accepted.

See Areas and Costs to learn how to use different Area types.

using UnityEngine;
using UnityEngine.AI;

public class TargetReachable : MonoBehaviour
{
    public Transform target;
    private NavMeshHit hit;
    private bool blocked = false;

    void Update()
    {
        // Allow pass through all area types when testing if the target position
        // is reachable from the transform location.
        blocked = NavMesh.Raycast(transform.position, target.position, out hit, NavMesh.AllAreas);
        Debug.DrawLine(transform.position, target.position, blocked ? Color.red : Color.green);
        if (blocked)
            Debug.DrawRay(hit.position, Vector3.up, Color.red);
    }
}