---
title: MTLAccelerationStructureMotionBoundingBoxGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtlaccelerationstructuremotionboundingboxgeometrydescriptor
---

# MTLAccelerationStructureMotionBoundingBoxGeometryDescriptor

A description of a list of bounding boxes, as motion keyframe data, to turn into an acceleration structure.

## Declaration

```swift
class MTLAccelerationStructureMotionBoundingBoxGeometryDescriptor
```

## Mentioned in

Improving ray-tracing data access using per-primitive data

## Topics

### Specifying the number of bounding boxes

- [boundingBoxCount](metal/mtlaccelerationstructuremotionboundingboxgeometrydescriptor/boundingboxcount.md)

### Specifying bounding boxes data

- [boundingBoxBuffers](metal/mtlaccelerationstructuremotionboundingboxgeometrydescriptor/boundingboxbuffers.md)
- [boundingBoxStride](metal/mtlaccelerationstructuremotionboundingboxgeometrydescriptor/boundingboxstride.md)

## Relationships

### Inherits From

- [MTLAccelerationStructureGeometryDescriptor](metal/mtlaccelerationstructuregeometrydescriptor.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Motion geometry descriptors

- [MTL4AccelerationStructureMotionTriangleGeometryDescriptor](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor.md)
- [MTLAccelerationStructureMotionTriangleGeometryDescriptor](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor.md)
- [MTL4AccelerationStructureMotionCurveGeometryDescriptor](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor.md)
- [MTLAccelerationStructureMotionCurveGeometryDescriptor](metal/mtlaccelerationstructuremotioncurvegeometrydescriptor.md)
- [MTL4AccelerationStructureMotionBoundingBoxGeometryDescriptor](metal/mtl4accelerationstructuremotionboundingboxgeometrydescriptor.md)
- [MTLMotionKeyframeData](metal/mtlmotionkeyframedata.md)