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# colliderNodes

The nodes whose geometry the system’s particles can collide with.

```
var colliderNodes: [SCNNode]? { get set }
```

## Discussion

A particle system can perform limited collision detection and resolution with geometries in the scene. If a moving particle intersects a geometry attached to one of the [`SCNNode`](/documentation/SceneKit/SCNNode) objects in this array, SceneKit resolves the collision, either by removing the particle from the scene or allowing it to bounce off or slide along the geometry’s surface.

> Note:
> Collision detection is computationally intensive. For the best rendering performance, limit the number of collider nodes for each particle system, and use only simple geometries—represented by the ``doc://com.apple.scenekit/documentation/SceneKit/SCNSphere``, ``doc://com.apple.scenekit/documentation/SceneKit/SCNPlane``, and ``doc://com.apple.scenekit/documentation/SceneKit/SCNFloor`` classes—as collision surfaces.

This array is empty by default.

---

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