---
title: layouts
framework: modelio
role: symbol
role_heading: Instance Property
path: modelio/mdlvertexdescriptor/layouts
---

# layouts

The list of vertex buffer layouts described by the vertex descriptor.

## Declaration

```swift
var layouts: NSMutableArray { get set }
```

## Discussion

Discussion A MDLVertexBufferLayout object describes the layout of data in one of the vertex buffers of a of a MDLMesh object. For meshes whose vertex data is split into multiple vertex buffers (a structure of arrays design), the order of objects in this array reflects the order of buffers in the mesh’s vertexBuffers array, which in turn parallels the order of vertex attributes in the descriptor’s attributes array. If a mesh contains interleaved data in a single vertex buffer (an array of structures design), the descriptor contains only one MDLVertexBufferLayout object, which describes the offset between entries for consecutive vertices in the buffer.

## See Also

### Working with Vertex Buffer Layouts

- [setPackedStrides()](modelio/mdlvertexdescriptor/setpackedstrides().md)