---
title: rasterizationRateMap
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlrenderpassdescriptor/rasterizationratemap
---

# rasterizationRateMap

The rasterization rate map to use when executing the render pass.

## Declaration

```swift
var rasterizationRateMap: (any MTLRasterizationRateMap)? { get set }
```

## Mentioned in

Rendering with a rasterization rate map

## Discussion

Discussion The default value is nil, which means that viewport coordinates are in the same coordinate system as the physical coordinates in the render target. Otherwise, Metal uses the rate map to convert between viewport coordinates and physical coordinates in the render target.