The NavMesh concept

Learn that the NavMesh defines walkable surfaces.

NavMesh (Navigation Mesh) Concept

A NavMesh (navigation mesh) is a geometric surface representation defining where AI characters can traverse and which obstacles they must avoid in the 3D world.

// Static scene geometry is included in the NavMesh calculation
// Walkable areas are displayed in the editor as a cyan mesh overlay

After tagging terrain and barriers as 'Navigation Static', the 'Bake' process automatically calculates the traversable (Walkable) topology.

NavMesh Layers and Area Costs

NavMesh surfaces can be segmented into distinct layers: Walkable (standard ground), Not Walkable (impassable barriers), and Jump (chasm gaps). Each area type carries an associated Area Cost.

using UnityEngine.AI;

// AI pathfinding prioritizes the shortest and least costly path

The pathfinding algorithm (A*) may favor longer, clear paths over shorter routes through high-cost mud or hazardous zones.

Exercise NavMesh status check

Define a Start method. Inside, declare string durum = "NavMesh yuzeyi hazir"; and print it to the console with Debug.Log(durum);.

Show example solution

using UnityEngine;

public class NavMeshInfo : MonoBehaviour
{
    void Start()
    {
        string durum = "NavMesh yuzeyi hazir";
        Debug.Log(durum);
    }
}

Test yourself

Which property must be enabled on scene objects for them to be included in the NavMesh Bake calculation?
- Is Trigger
- Shader Graph Alpha
- AudioSource Mute
- Navigation Static
Show answer

Navigation Static — During NavMesh baking, only stationary objects flagged as 'Navigation Static' are evaluated as walkable surfaces or obstacles.

Import navigation namespace

using UnityEngine.____;

Show answer

using UnityEngine.AI;

NavMesh core concepts

NavMesh

Navigation mesh for walkable areas
Bake

Generating NavMesh from geometry
Walkable

Free surface where characters can walk
Area Cost

Cost multiplier of a NavMesh area

Next lesson: NavMeshAgent

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