---
title: motionTransformsCount
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlaccelerationstructuremotioninstancedescriptor/motiontransformscount
---

# motionTransformsCount

The number of motion data key-frames, which applies to the next acceleration-structure motion instance you create with the descriptor.

## Declaration

```swift
var motionTransformsCount: UInt32
```

## See Also

### Specifying motion data

- [motionStartTime](metal/mtlaccelerationstructuremotioninstancedescriptor/motionstarttime.md)
- [motionEndTime](metal/mtlaccelerationstructuremotioninstancedescriptor/motionendtime.md)
- [motionStartBorderMode](metal/mtlaccelerationstructuremotioninstancedescriptor/motionstartbordermode.md)
- [motionEndBorderMode](metal/mtlaccelerationstructuremotioninstancedescriptor/motionendbordermode.md)
- [motionTransformsStartIndex](metal/mtlaccelerationstructuremotioninstancedescriptor/motiontransformsstartindex.md)