---
title: MTL4AccelerationStructureCurveGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtl4accelerationstructurecurvegeometrydescriptor
---

# MTL4AccelerationStructureCurveGeometryDescriptor

Describes curve geometry suitable for ray tracing.

## Declaration

```swift
class MTL4AccelerationStructureCurveGeometryDescriptor
```

## Overview

Overview Use a MTLResidencySet to mark residency of all buffers this descriptor references when you build this acceleration structure.

## Topics

### Instance Properties

- [controlPointBuffer](metal/mtl4accelerationstructurecurvegeometrydescriptor/controlpointbuffer.md)
- [controlPointCount](metal/mtl4accelerationstructurecurvegeometrydescriptor/controlpointcount.md)
- [controlPointFormat](metal/mtl4accelerationstructurecurvegeometrydescriptor/controlpointformat.md)
- [controlPointStride](metal/mtl4accelerationstructurecurvegeometrydescriptor/controlpointstride.md)
- [curveBasis](metal/mtl4accelerationstructurecurvegeometrydescriptor/curvebasis.md)
- [curveEndCaps](metal/mtl4accelerationstructurecurvegeometrydescriptor/curveendcaps.md)
- [curveType](metal/mtl4accelerationstructurecurvegeometrydescriptor/curvetype.md)
- [indexBuffer](metal/mtl4accelerationstructurecurvegeometrydescriptor/indexbuffer.md)
- [indexType](metal/mtl4accelerationstructurecurvegeometrydescriptor/indextype.md)
- [radiusBuffer](metal/mtl4accelerationstructurecurvegeometrydescriptor/radiusbuffer.md)
- [radiusFormat](metal/mtl4accelerationstructurecurvegeometrydescriptor/radiusformat.md)
- [radiusStride](metal/mtl4accelerationstructurecurvegeometrydescriptor/radiusstride.md)
- [segmentControlPointCount](metal/mtl4accelerationstructurecurvegeometrydescriptor/segmentcontrolpointcount.md)
- [segmentCount](metal/mtl4accelerationstructurecurvegeometrydescriptor/segmentcount.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)
- [MTLAccelerationStructureCurveGeometryDescriptor](metal/mtlaccelerationstructurecurvegeometrydescriptor.md)
- [MTLCurveType](metal/mtlcurvetype.md)
- [MTLCurveBasis](metal/mtlcurvebasis.md)
- [MTLCurveEndCaps](metal/mtlcurveendcaps.md)
- [MTL4AccelerationStructureBoundingBoxGeometryDescriptor](metal/mtl4accelerationstructureboundingboxgeometrydescriptor.md)
- [MTLAccelerationStructureBoundingBoxGeometryDescriptor](metal/mtlaccelerationstructureboundingboxgeometrydescriptor.md)