projectionMatrix(viewRotationAngle:viewportSize:zNear:zFar:)

Declaration

func projectionMatrix(viewRotationAngle: CGFloat, viewportSize: CGSize, zNear: CGFloat, zFar: CGFloat) -> simd_float4x4

Parameters

• viewRotationAngle:

  View rotation angle in degrees.

• viewportSize:

  Viewport size.

• zNear:

  Near depth limit.

• zFar:

  Far depth limit.

Return Value

The projection matrix for the given parameters.

Discussion

The projection matrix returned provides an aspect fill for the provided viewport size and view angle. If zFar is set to 0, an infinite projection matrix will be returned.

The view angle, in degrees, is the clockwise rotation needed to keep the camera image level with the horizon (0 LandscapeRight, 90 Portrait, 180 LandscapeLeft, 270 PortraitUpsideDown). Obtain it from ARSession.viewRotationAngle.