<!--
{
  "availability" : [
    "iOS: 9.0.0 -",
    "iPadOS: 9.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.11.0 -",
    "tvOS: 9.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "ModelIO",
  "identifier" : "/documentation/ModelIO/MDLTransform/scale",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Model I/O"
    ],
    "preciseIdentifier" : "c:objc(cs)MDLTransform(py)scale"
  },
  "title" : "scale"
}
-->

# scale

The x-, y-, and z-axis scale factors of the transform relative to its parent coordinate space.

```
var scale: vector_float3 { get set }
```

## Discussion

Together with the [`translation`](/documentation/ModelIO/MDLTransform/translation), [`rotation`](/documentation/ModelIO/MDLTransform/rotation), and [`shear`](/documentation/ModelIO/MDLTransform/shear) properties, this property defines the local coordinate space for any object affected by the transform, relative to a parent coordinate space. Use the [`matrix`](/documentation/ModelIO/MDLTransformComponent/matrix) property to work with the complete transform.

If the transform includes time-based information, reading this property returns the scale as of the earliest time sample (as reported by the [`minimumTime`](/documentation/ModelIO/MDLTransformComponent/minimumTime) property). Writing to this property erases any time-sampled data for the scale factor. To work with time-sampled data from an animated transform, use the [`scale(atTime:)`](/documentation/ModelIO/MDLTransform/scale(atTime:)) and [`setScale(_:forTime:)`](/documentation/ModelIO/MDLTransform/setScale(_:forTime:)) methods.

---

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)