---
title: "init(mesh:device:)"
framework: metalkit
role: symbol
role_heading: Initializer
path: "metalkit/mtkmesh/init(mesh:device:)"
---

# init(mesh:device:)

Initializes a MetalKit mesh and its submeshes from a Model I/O mesh.

## Declaration

```swift
init(mesh: MDLMesh, device: any MTLDevice) throws
```

## Parameters

- `mesh`: The source Model I/O mesh from which to create this MetalKit mesh.
- `device`: The Metal device on which to create MetalKit mesh resources.

## Return Value

Return Value A new MetalKit mesh object, or nil if an error occured.

## Discussion

Discussion This initializer does not initialize any children meshes of the Model I/O mesh. All vertex buffers in the source Model I/O mesh and the index buffer of each of its submeshes must have been created with a MTKMeshBufferAllocator object. A Model I/O submesh may have its index type and/or geometric primitive type converted to a corresponding Metal type as listed in the tables below. If the geometric primitive type cannot be converted, an error is returned through error.  |   |   |   |   |   |   |   |  note: In macOS, vertex buffers allocated from a MTKMeshBufferAllocator object are aligned to 256 bytes. Index buffers are not aligned.