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Inner Workings of the Navigation System

Advanced NavMesh Bake Settings

The process of creating a NavMesh from the level geometry is called NavMesh Baking. The process collects the Render Meshes and TerrainsThe landscape in your scene. A Terrain GameObject adds a large flat plane to your scene and you can use the Terrain’s Inspector window to create a detailed landscape. More info
See in Glossary of all Game Objects which are marked as Navigation Static, and then processes them to create a navigation meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
See in Glossary that approximates the walkable surfaces of the level.

In Unity, NavMesh generation is handled from the Navigation window (menu: Window > AI > Navigation (Obsolete)).

Building a NavMesh for your sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary can be done in 4 quick steps:

  1. Select scene geometry that should affect the navigation – walkable surfaces and obstacles.
  2. Check Navigation Static on to include selected objects in the NavMesh baking process.
  3. Adjust the bake settings to match your agent size.

    • Agent Radius defines how close the agent center can get to a wall or a ledge.
    • Agent Height defines how low the spaces are that the agent can reach.
    • Max Slope defines how steep the ramps are that the agent walk up.
    • Step Height defines how high obstructions are that the agent can step on.
  4. Click bake to build the NavMesh.

The resulting NavMesh will be shown in the scene as a blue overlay on the underlying level geometry whenever the Navigation Window is open and visible.

As you may have noticed in the above pictures, the walkable area in the generated NavMesh appears shrunk. The NavMesh represents the area where the center of the agent can move. Conceptually, it doesn’t matter whether you regard the agent as a point on a shrunken NavMesh or a circle on a full-size NavMesh since the two are equivalent. However, the point interpretation allows for better runtime efficiency and also allows the designer to see immediately whether an agent can squeeze through gaps without worrying about its radius.

Another thing to keep in mind is that the NavMesh is an approximation of the walkable surface. This can be seen for example in the stairs which are represented as a flat surface, while the source surface has steps. This is done in order to keep the NavMesh data size small. The side effect of the approximation is that sometimes you will need to have a little extra space in your level geometry to allow the agent to pass through any tight spots.

When baking is complete, you will find a NavMesh asset file inside a folder with the same name as the scene the NavMesh belongs to. For example, if you have a scene called First Level in the Assets folder, the NavMesh will be at Assets > First Level > NavMesh.asset.

Additional resources

Inner Workings of the Navigation System

Advanced NavMesh Bake Settings