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# CMFormatDescription.Extensions.Value.ProjectionKind

```
struct ProjectionKind
```

## Topics

### Type Properties

[`static let appleImmersiveVideo: CMFormatDescription.Extensions.Value.ProjectionKind`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/ProjectionKind/appleImmersiveVideo)

Indicates a proprietary projection used for Apple Immersive Video.

[`static let equirectangular: CMFormatDescription.Extensions.Value.ProjectionKind`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/ProjectionKind/equirectangular)

Indicates equirectangular projection of a 360 degree sphere to a rectangular plane, where longitude
and latitude of the sphere are mapped linearly to the x,y axes of the plane.

[`static let halfEquirectangular: CMFormatDescription.Extensions.Value.ProjectionKind`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/ProjectionKind/halfEquirectangular)

Indicates half equirectangular projection of a 180 degree hemisphere to a rectangular plane, where
longitude and latitude of the sphere are mapped linearly to the x,y axes of the plane

[`static let parametricImmersive: CMFormatDescription.Extensions.Value.ProjectionKind`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/ProjectionKind/parametricImmersive)

Indicates a projection described mathematically by a model of camera lens calibration parameters.
Parameters may be found in lens calibration metadata in [`cameraCalibrationDataLensCollection`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Key/cameraCalibrationDataLensCollection)
with algorithmKind being [`CMFormatDescription.Extensions.Value.CameraCalibrationDataLensCollection.AlgorithmKind.parametric`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/CameraCalibrationDataLensCollection/AlgorithmKind/parametric).

[`static let rectilinear: CMFormatDescription.Extensions.Value.ProjectionKind`](/documentation/CoreMedia/CMFormatDescription/Extensions-swift.struct/Value/ProjectionKind/rectilinear)

Indicates rectilinear projection. Generally less than 90 degree field of view with no
barrel distortion.

## Relationships

### Conforms To

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Hashable`](/documentation/Swift/Hashable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

---

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