---
title: "roll(by:aroundScreenPoint:viewport:)"
framework: scenekit
role: symbol
role_heading: Instance Method
path: "scenekit/scncameracontroller/roll(by:aroundscreenpoint:viewport:)"
---

# roll(by:aroundScreenPoint:viewport:)

## Declaration

```swift
func roll(by delta: Float, aroundScreenPoint point: CGPoint, viewport: CGSize)
```