---
title: LensDistortionData
framework: realitykit
role: symbol
role_heading: Structure
path: realitykit/lensdistortiondata
---

# LensDistortionData

A description of estimated lens distortion that can be used to rectify images.

## Declaration

```swift
struct LensDistortionData
```

## Overview

Overview See also: AVCameraCalibrationData Example of a per-pixel undistort function using this data: func undistortPoint(lensDistortionData: LensDistortionData,                     imageSize: SIMD2<Float>,                     point: SIMD2<Float>) -> SIMD2<Float> {    // The lookup table holds the relative radial magnification for n linearly spaced radii.    // The first position corresponds to radius = 0    // The last position corresponds to the largest radius found in the image.

// Determine the maximum radius.    let opticalCenter: SIMD2<Float> = lensDistortionData.center    let deltaXMax: Float = max(opticalCenter.x, imageSize.x  - opticalCenter.x)    let deltaYMax: Float = max(opticalCenter.y, imageSize.y - opticalCenter.y)    let radiusMax: Float = sqrt(deltaXMax * deltaXMax + deltaYMax * deltaYMax)

// Determine the vector from the optical center to the given point.    let centerToPoint: SIMD2<Float> = point - opticalCenter

// Determine the radius of the given point.    let pointRadius: Float = length(centerToPoint)

// Look up the relative radial magnification to apply in the provided lookup table    var magnification: Float = 1.0    let radialLut = lensDistortionData.radialLookupTable    if pointRadius < radiusMax {        // Linear interpolation based on piecewise linear function of normalized radius        let value = pointRadius * Float(radialLut.count - 1) / radiusMax        let index = Int(value)        let fraction  = value - Float(index)

let magLeft = radialLut[index]        let magRight = radialLut[index + 1]

magnification = ( 1.0 - fraction ) * magLeft + fraction * magRight    } else {        magnification = radialLut[radialLut.count - 1]    }

// Apply radial magnification    let centerToRectifiedPoint: SIMD2<Float> = centerToPoint + magnification * centerToPoint

// Construct output    return opticalCenter + centerToRectifiedPoint  }

## Topics

### Initializers

- [init(center:radialLookupTable:)](realitykit/lensdistortiondata/init(center:radiallookuptable:).md)

### Instance Properties

- [center](realitykit/lensdistortiondata/center.md)
- [radialLookupTable](realitykit/lensdistortiondata/radiallookuptable.md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Visual adjustments

- [HoverEffectComponent](realitykit/hovereffectcomponent.md)
- [BillboardComponent](realitykit/billboardcomponent.md)
- [EnvironmentBlendingComponent](realitykit/environmentblendingcomponent.md)
- [ImagePresentationComponent](realitykit/imagepresentationcomponent.md)