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# sources

An array of geometry sources that provide vertex data for the geometry.

```
var sources: [SCNGeometrySource] { get }
```

## Discussion

Each [`SCNGeometrySource`](/documentation/SceneKit/SCNGeometrySource) object describes an attribute of all vertices in the geometry (such as vertex position, surface normal vector, color, or texture mapping coordinates) identified by the source’s [`semantic`](/documentation/SceneKit/SCNGeometrySource/semantic-swift.property) property. A geometry always has at least one source (for the [`vertex`](/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/vertex) semantic), typically has additional sources for use in lighting and shading, and may have other sources for skeletal animation or surface subdivision information.

---

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