---
title: MTL4AccelerationStructureBoundingBoxGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtl4accelerationstructureboundingboxgeometrydescriptor
---

# MTL4AccelerationStructureBoundingBoxGeometryDescriptor

Describes bounding-box geometry suitable for ray tracing.

## Declaration

```swift
class MTL4AccelerationStructureBoundingBoxGeometryDescriptor
```

## Overview

Overview You use bounding boxes to implement procedural geometry for ray tracing, such as spheres or any other shape you define by using intersection functions. Use a MTLResidencySet to mark residency of all buffers this descriptor references when you build this acceleration structure.

## Topics

### Instance Properties

- [boundingBoxBuffer](metal/mtl4accelerationstructureboundingboxgeometrydescriptor/boundingboxbuffer.md)
- [boundingBoxCount](metal/mtl4accelerationstructureboundingboxgeometrydescriptor/boundingboxcount.md)
- [boundingBoxStride](metal/mtl4accelerationstructureboundingboxgeometrydescriptor/boundingboxstride.md)

## Relationships

### Inherits From

- [MTL4AccelerationStructureGeometryDescriptor](metal/mtl4accelerationstructuregeometrydescriptor.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

### Geometry descriptors

- [MTL4AccelerationStructureGeometryDescriptor](metal/mtl4accelerationstructuregeometrydescriptor.md)
- [MTLAccelerationStructureGeometryDescriptor](metal/mtlaccelerationstructuregeometrydescriptor.md)
- [MTL4AccelerationStructureTriangleGeometryDescriptor](metal/mtl4accelerationstructuretrianglegeometrydescriptor.md)
- [MTLAccelerationStructureTriangleGeometryDescriptor](metal/mtlaccelerationstructuretrianglegeometrydescriptor.md)
- [MTL4AccelerationStructureCurveGeometryDescriptor](metal/mtl4accelerationstructurecurvegeometrydescriptor.md)
- [MTLAccelerationStructureCurveGeometryDescriptor](metal/mtlaccelerationstructurecurvegeometrydescriptor.md)
- [MTLCurveType](metal/mtlcurvetype.md)
- [MTLCurveBasis](metal/mtlcurvebasis.md)
- [MTLCurveEndCaps](metal/mtlcurveendcaps.md)
- [MTLAccelerationStructureBoundingBoxGeometryDescriptor](metal/mtlaccelerationstructureboundingboxgeometrydescriptor.md)