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# ARGeometrySource

Mesh data in a buffer-based array.

```
class ARGeometrySource
```

## Overview

Mesh-anchor geometry ([`ARMeshGeometry`](/documentation/ARKit/ARMeshGeometry)) uses geometry sources to hold 3D data like vertices, and normals, in an efficent, array-like format. A Metal buffer wraps the data, and other properties specify  how to interpret that data.

In the case that [`componentsPerVector`](/documentation/ARKit/ARGeometrySource/componentsPerVector) is greater than 1, the element type of the geometry-source array is itself a sequence (pairs, triplets, and so on).

## Topics

### Accessing Geometry

[`subscript(_:)`](/documentation/ARKit/ARGeometrySource/subscript(_:)-3v98f)

Provides the source float triplet at the subscripted index.

[`subscript(_:)`](/documentation/ARKit/ARGeometrySource/subscript(_:)-7jf4y)

Provides the number at the subscripted index.

[`buffer`](/documentation/ARKit/ARGeometrySource/buffer)

A Metal buffer that contains a list of vectors.

### Getting Geometry Information

[`componentsPerVector`](/documentation/ARKit/ARGeometrySource/componentsPerVector)

The number of scalar components in each vector.

[`count`](/documentation/ARKit/ARGeometrySource/count)

The number of vectors in the buffer.

[`format`](/documentation/ARKit/ARGeometrySource/format)

The type of vector data in the buffer.

[`offset`](/documentation/ARKit/ARGeometrySource/offset)

The offset, in bytes, from the beginning of the buffer.

[`stride`](/documentation/ARKit/ARGeometrySource/stride)

The length, in bytes, of the start of one vector in the buffer to the start of the next vector.


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