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# radiusBufferOffset

The offset, in bytes, to the radius data in the buffer.

```
var radiusBufferOffset: Int { get set }
```

## Discussion

The offset needs to be a multiple of the radius format you configure with the [`radiusFormat`](/documentation/Metal/MTLAccelerationStructureCurveGeometryDescriptor/radiusFormat) property.
You also need to align the offset to both the radius format’s size and the platform’s buffer alignment requirement.

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