DistortionMesh class

Polynomial radial distortion for VR lens correction. Based on Google Cardboard SDK distortion algorithm.

Uses a pre-computed mesh grid to warp the rendered image to counteract the lens barrel distortion of VR headsets.

Constructors

DistortionMesh({List<double> coefficients = const [0.441, 0.156], int resolution = 40, double screenToLensDistance = 0.042, double interLensDistance = 0.06})

DistortionMesh.cardboardV1()

Google Cardboard V1 preset.

factory

DistortionMesh.cardboardV2()

Google Cardboard V2 preset.

factory

DistortionMesh.none()

No distortion (flat).

factory

Properties

coefficients → List<double>

Distortion coefficients (K1, K2, ...).

final

distortedPoints ↔ List<Offset>

Pre-computed distorted UV coordinates.

late, final

hashCode → int

The hash code for this object.

no setter, inherited

indices ↔ List<int>

late, final

interLensDistance → double

Inter-lens distance in meters.

final

originalPoints ↔ List<Offset>

late, final

resolution → int

Grid resolution (default 40x40 like Cardboard SDK).

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

screenToLensDistance → double

Screen-to-lens distance in meters.

final

Methods

applyToCanvas(Canvas canvas, Size viewportSize, {bool isLeftEye = true}) → void

Draws the distortion mesh on a canvas as a wireframe grid (for debug).

distort(double nx, double ny) → Offset

Applies polynomial radial distortion.

distortionFactor(double rSquared) → double

drawDistortedImage(Canvas canvas, Image image, Size viewportSize, {Matrix4? atwTransform, bool enableChromaticAberration = false}) → void

Warps a rendered offline Image onto the target canvas using the pre-computed distortion mesh. Supports atwTransform matrix for Asynchronous Time Warp and enableChromaticAberration for correcting lens chromatic dispersion via multi-pass RGB blend.

inverseDistort(double radius) → double

Computes inverse distortion using Secant method. Given a distorted radius, finds the undistorted radius.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited