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# semantic

The semantic value (or attribute) the geometry source describes for each vertex.

```
var semantic: SCNGeometrySource.Semantic { get }
```

## Discussion

A semantic describes an attribute for each vertex, such as position, color, surface normal vector, or texture coordinates.

See [`SCNGeometrySource.Semantic`](/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct) for available values.

---

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