<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.4.0 -",
    "macOS: 10.15.4 -",
    "tvOS: 16.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Metal",
  "identifier" : "/documentation/Metal/MTLDevice/makeRasterizationRateMap(descriptor:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Metal"
    ],
    "preciseIdentifier" : "c:objc(pl)MTLDevice(im)newRasterizationRateMapWithDescriptor:"
  },
  "title" : "makeRasterizationRateMap(descriptor:)"
}
-->

# makeRasterizationRateMap(descriptor:)

Creates a rasterization rate map instance.

```
func makeRasterizationRateMap(descriptor: MTLRasterizationRateMapDescriptor) -> (any MTLRasterizationRateMap)?
```

## Parameters

`descriptor`

An [`MTLRasterizationRateMapDescriptor`](/documentation/Metal/MTLRasterizationRateMapDescriptor) instance.

## Return Value

A new [`MTLRasterizationRateMapDescriptor`](/documentation/Metal/MTLRasterizationRateMapDescriptor) instance if the method
completes successfully; otherwise `nil`.

## Discussion

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)