---
title: motionStartBorderMode
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motionstartbordermode
---

# motionStartBorderMode

The motion border mode describing what happens if Metal samples the acceleration structure before the motion start time.

## Declaration

```swift
var motionStartBorderMode: MTLMotionBorderMode
```

## See Also

### Specifying motion data

- [motionStartTime](metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motionstarttime.md)
- [motionEndTime](metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motionendtime.md)
- [motionEndBorderMode](metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motionendbordermode.md)
- [motionTransformsCount](metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motiontransformscount.md)
- [motionTransformsStartIndex](metal/mtlindirectaccelerationstructuremotioninstancedescriptor/motiontransformsstartindex.md)