---
title: "makeRasterizationRateMap(descriptor:)"
framework: metal
role: symbol
role_heading: Instance Method
path: "metal/mtldevice/makerasterizationratemap(descriptor:)"
---

# makeRasterizationRateMap(descriptor:)

Creates a rasterization rate map instance.

## Declaration

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

## Parameters

- `descriptor`: An doc://com.apple.metal/documentation/Metal/MTLRasterizationRateMapDescriptor instance.

## Return Value

Return Value A new MTLRasterizationRateMapDescriptor instance if the method completes successfully; otherwise nil.

## See Also

### Creating rasterization rate maps

- [supportsRasterizationRateMap(layerCount:)](metal/mtldevice/supportsrasterizationratemap(layercount:).md)