---
title: init()
framework: metal
role: symbol
role_heading: Initializer
path: metal/mtlaccelerationstructuremotioninstancedescriptor/init()
---

# init()

Creates an acceleration-structure motion instance with default property values.

## Declaration

```swift
init()
```

## See Also

### Creating an instance descriptor

- [init(options:mask:intersectionFunctionTableOffset:accelerationStructureIndex:userID:motionTransformsStartIndex:motionTransformsCount:motionStartBorderMode:motionEndBorderMode:motionStartTime:motionEndTime:)](metal/mtlaccelerationstructuremotioninstancedescriptor/init(options:mask:intersectionfunctiontableoffset:accelerationstructureindex:userid:motiontransformsstartindex:motiontransformscount:motionstartbordermode:motionendbordermode:motionstarttime:motionendtime:).md)