Creating a NavMesh Agent

Once you have a NavMesh baked for your level it is time to create a character which can navigate the scene. We’re going to build our prototype agent from a cylinder and set it in motion. This is done using a NavMesh Agent component and a simple script.

First let’s create the character:

  1. Create a cylinder: GameObject > 3D Object > Cylinder.
  2. The default cylinder dimensions (height 2 and radius 0.5) are good for a humanoid shaped agent, so we will leave them as they are.
  3. Add a NavMesh Agent component: Component > Navigation > NavMesh Agent.

Now you have simple NavMesh Agent set up ready to receive commands!

When you start to experiment with a NavMesh Agent, you most likely are going to adjust its dimensions for your character size and speed.

The NavMesh Agent component handles both the pathfinding and the movement control of a character. In your scripts, navigation can be as simple as setting the desired destination point - the NavMesh Agent can handle everything from there on.

    // MoveTo.cs
    using UnityEngine;
    using UnityEngine.AI;

    public class MoveTo : MonoBehaviour {

       public Transform goal;

       void Start () {
          NavMeshAgent agent = GetComponent<NavMeshAgent>();
          agent.destination = goal.position; 
       }
    }

Next we need to build a simple script which allows you to send your character to the destination specified by another Game Object, and a Sphere which will be the destination to move to:

  1. Create a new C# script (MoveTo.cs) and replace its contents with the above script.
  2. Assign the MoveTo script to the character you’ve just created.
  3. Create a sphere, this will be the destination the agent will move to.
  4. Move the sphere away from the character to a location that is close to the NavMesh surface.
  5. Select the character, locate the MoveTo script, and assign the Sphere to the Goal property.
  6. Press Play; you should see the agent navigating to the location of the sphere.

To sum it up, in your script, you will need to get a reference to the NavMesh Agent component and then to set the agent in motion, you just need to assign a position to its destination property. The Navigation How Tos will give you further examples on how to solve common gameplay scenarios with the NavMesh Agent.

Additional resources