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# obstacles(fromNodePhysicsBodies:)

Converts each node into an obstacle by transforming the node’s physics body shape into the scene’s coordinate system.

```
class func obstacles(fromNodePhysicsBodies nodes: [SKNode]) -> [GKPolygonObstacle]
```

## Parameters

`nodes`

An array of [`SKNode`](/documentation/SpriteKit/SKNode) objects.

## Return Value

An array of <doc://com.apple.documentation/documentation/GameplayKit/GKPolygonObstacle> objects.

## Discussion

Use the array of obstacles to create an obstacle graph (<doc://com.apple.documentation/documentation/GameplayKit/GKObstacleGraph>) in GameplayKit. See <doc://com.apple.documentation/documentation/GameplayKit> and [GameplayKit Programming Guide](https://developer.apple.com/library/archive/documentation/General/Conceptual/GameplayKit_Guide/index.html#//apple_ref/doc/uid/TP40015172).

---

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