<!--
{
  "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(atTime:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Model I/O"
    ],
    "preciseIdentifier" : "c:objc(cs)MDLTransform(im)scaleAtTime:"
  },
  "title" : "scale(atTime:)"
}
-->

# scale(atTime:)

Returns the x-, y-, and z-axis scale factors of the transform relative to its parent coordinate space, as of the specified time sample.

```
func scale(atTime time: TimeInterval) -> vector_float3
```

## Parameters

`time`

The time sample for which to request information.

## Return Value

The scale factors of the transform.

## Discussion

Together with the translation, rotation, and shear factors, a scale factor defines the local coordinate space for any object affected by the transform, relative to a parent coordinate space. To work with the complete transform, use the [`localTransform(atTime:)`](/documentation/ModelIO/MDLTransformComponent/localTransform(atTime:)) and [`setLocalTransform(_:forTime:)`](/documentation/ModelIO/MDLTransformComponent/setLocalTransform(_:forTime:)) methods.

Requesting a sample outside the time range clamps results to the [`minimumTime`](/documentation/ModelIO/MDLTransformComponent/minimumTime) or [`maximumTime`](/documentation/ModelIO/MDLTransformComponent/maximumTime) sample. Some asset formats support continuous sampling with interpolation for times between the samples stored in the asset; others are discrete. For an asset with discrete time information, requesting a sample time in between the samples stored in the asset returns data for the immediately preceding time.

---

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)