---
title: MTL4AccelerationStructureMotionCurveGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtl4accelerationstructuremotioncurvegeometrydescriptor
---

# MTL4AccelerationStructureMotionCurveGeometryDescriptor

Describes motion curve geometry, suitable for motion ray tracing.

## Declaration

```swift
class MTL4AccelerationStructureMotionCurveGeometryDescriptor
```

## Overview

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

## Topics

### Instance Properties

- [controlPointBuffers](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/controlpointbuffers.md)
- [controlPointCount](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/controlpointcount.md)
- [controlPointFormat](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/controlpointformat.md)
- [controlPointStride](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/controlpointstride.md)
- [curveBasis](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/curvebasis.md)
- [curveEndCaps](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/curveendcaps.md)
- [curveType](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/curvetype.md)
- [indexBuffer](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/indexbuffer.md)
- [indexType](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/indextype.md)
- [radiusBuffers](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/radiusbuffers.md)
- [radiusFormat](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/radiusformat.md)
- [radiusStride](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/radiusstride.md)
- [segmentControlPointCount](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/segmentcontrolpointcount.md)
- [segmentCount](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor/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

### Motion geometry descriptors

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