<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -",
    "watchOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/vImage_PerpsectiveTransform/init(a:b:c:d:tx:ty:vx:vy:v:)",
  "metadataVersion" : "0.1.0",
  "role" : "Initializer",
  "symbol" : {
    "kind" : "Initializer",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "s:So27vImage_PerpsectiveTransformV1a1b1c1d2tx2ty2vx2vy1vABSf_S8ftcfc"
  },
  "title" : "init(a:b:c:d:tx:ty:vx:vy:v:)"
}
-->

# init(a:b:c:d:tx:ty:vx:vy:v:)

Creates a projective-transformation structure from the specified single-precision values.

```
init(a: Float, b: Float, c: Float, d: Float, tx: Float, ty: Float, vx: Float, vy: Float, v: Float)
```

## Parameters

`a`

The top-left cell in the 3 x 3 transformation matrix.

`b`

The top-middle cell in the 3 x 3 transformation matrix.

`c`

The middle-left cell in the 3 x 3 transformation matrix.

`d`

The middle-middle cell in the 3 x 3 transformation matrix.

`tx`

The x-coordinate translation.

`ty`

The y-coordinate translation.

`vx`

The x-component of the projective vector.

`vy`

The y-component of the projective vector.

`v`

The homogeneous scale factor.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)