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# init(normals:)

Creates a geometry source from an array of normal vectors.

```
@nonobjc convenience init(normals: [SCNVector3])
```

## Parameters

`normals`

An array of three-component vectors, each of which represents a surface normal for the geometry source.

## Return Value

A new geometry source whose [`semantic`](/documentation/SceneKit/SCNGeometrySource/semantic-swift.property) property is [`normal`](/documentation/SceneKit/SCNGeometrySource/Semantic-swift.struct/normal).

## Discussion

SceneKit converts this data to its own format to optimize rendering performance. To read the converted data, examine the properties of the created [`SCNGeometrySource`](/documentation/SceneKit/SCNGeometrySource) object.

To create a custom [`SCNGeometry`](/documentation/SceneKit/SCNGeometry) object from the geometry source, use the [`init(sources:elements:)`](/documentation/SceneKit/SCNGeometry/init(sources:elements:)) method.

---

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