---
title: "init(vertexCapacity:vertexAttributes:vertexLayouts:indexCapacity:indexType:instanceCapacity:)"
framework: realitykit
role: symbol
role_heading: Initializer
path: "realitykit/lowlevelmeshresource/descriptor-swift.struct/init(vertexcapacity:vertexattributes:vertexlayouts:indexcapacity:indextype:instancecapacity:)"
---

# init(vertexCapacity:vertexAttributes:vertexLayouts:indexCapacity:indexType:instanceCapacity:)

Creates a mesh descriptor with the given vertex capacity, attributes, layouts, index capacity, index type, and instance capacity.

## Declaration

```swift
init(vertexCapacity: Int = 0, vertexAttributes: [LowLevelMeshResource.Attribute] = [Attribute](), vertexLayouts: [LowLevelMeshResource.Layout] = [Layout](), indexCapacity: Int = 0, indexType: MTLIndexType = MTLIndexType.uint32, instanceCapacity: Int = 0)
```

## Parameters

- `vertexCapacity`: The maximum number of vertices to allocate space for. Defaults to 0.
- `vertexAttributes`: The vertex input attributes. Defaults to [].
- `vertexLayouts`: The vertex buffer layouts. Defaults to [].
- `indexCapacity`: The maximum number of indices to allocate space for. Defaults to 0.
- `indexType`: The data type of the values stored in the index buffer. Defaults to .uint32.
- `instanceCapacity`: The maximum number of instances for per-instance vertex data. Defaults to 0.