Simple wrapper classes for handling Navmesh Area related operations in Unity.

NavMeshAreaIDs.cs

using UnityEngine.AI;

/// <summary>
/// Convenience class for handling NavMesh Area related operations and lookups in Unity.
/// </summary>
public readonly struct UnityNavMeshLayer
{
    /// <summary>
    /// Name of the Area as defined in the Navigation window in Unity.
    /// </summary>
    public readonly string Name;

    /// <summary>
    /// To be used for mask related queries such as <see cref="NavMeshAgent.SamplePathPosition(int, float, out UnityEngine.AI.NavMeshHit)"/>.
    /// </summary>
    public readonly int Mask;

    /// <summary>
    /// ID of the Area for doing lookups and comparisons.
    /// </summary>
    public readonly int ID;

    public UnityNavMeshLayer(string name)
    {
        Name = name;
        ID = NavMesh.GetAreaFromName(name);
        Mask = 1 << ID;
    }
}

/// <summary>
/// Wrapper class for all the NavMesh Areas that the game uses. Can be accessed from anywhere.
/// </summary>
public static class NavMeshAreaIDs
{
    // These are the default hardcoded Areas used by Unity. When you add a new Area for your game,
    // simply add a new entry using its name.
    public static readonly UnityNavMeshLayer Walkable = new UnityNavMeshLayer("Walkable");
    public static readonly UnityNavMeshLayer NotWalkable = new UnityNavMeshLayer("Not Walkable");
    public static readonly UnityNavMeshLayer Jump = new UnityNavMeshLayer("Jump");
    public static readonly UnityNavMeshLayer Road = new UnityNavMeshLayer("Road");
}