Creating an OffMesh Link

OffMesh Links are used to create paths crossing outside the walkable navigation mesh surface. For example, jumping over a ditch or a fence, or opening a door before walking through it, can be all described as OffMesh links.

We’re going to add an OffMesh link component to describe a jump from the upper platform to the ground.

1. First create two cylinders: Game Object > 3D Object > cylinder.
2. You can scale the cylinders to (0.1, 0.5, 0.1) to make it easier to work with them.
3. Move the first cylinder to the edge of the top platform, close to the NavMesh surface.
4. 将第二个圆柱体放在地面上，靠近导航网格，在链接应着陆的位置。
5. Select the first cylinder cylinder and add an OffMesh link component to it. Choose Add Component from the inspector and choose Navigation > Off Mesh Link.
6. Assign the first cylinder in the Start field and the second cylinder in the End field.

Now you have a functioning OffMesh Link set up! If the path via the OffMesh link is shorter than via the NavMesh, the OffMesh link is used.

You can use any game object in the scene to hold the OffMesh link component, for example a fence prefab could contain the OffMesh link component. Similarly you can use any game object with a Transform as the start and end marker.

The NavMesh bake process can detect and create common jump-across and drop-down links automatically. Take a look at the Building OffMesh Links Automatically for more details.

Additional resources

• Building OffMesh Links Automatically - learn how to automatically build OffMesh Links.
• 导航操作方法 - 导航网格代理的常见用例以及源代码。
• OffMesh Link component reference – full description of all the OffMesh Link properties.
• OffMesh Link scripting reference - full description of the OffMesh Link scripting API.