---
title: MTL4AccelerationStructureMotionTriangleGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor
---

# MTL4AccelerationStructureMotionTriangleGeometryDescriptor

Describes motion triangle geometry, suitable for motion ray tracing.

## Declaration

```swift
class MTL4AccelerationStructureMotionTriangleGeometryDescriptor
```

## Overview

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

## Topics

### Instance Properties

- [indexBuffer](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/indexbuffer.md)
- [indexType](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/indextype.md)
- [transformationMatrixBuffer](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/transformationmatrixbuffer.md)
- [transformationMatrixLayout](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/transformationmatrixlayout.md)
- [triangleCount](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/trianglecount.md)
- [vertexBuffers](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/vertexbuffers.md)
- [vertexFormat](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/vertexformat.md)
- [vertexStride](metal/mtl4accelerationstructuremotiontrianglegeometrydescriptor/vertexstride.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

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