---
title: MTLAccelerationStructureMotionTriangleGeometryDescriptor
framework: metal
role: symbol
role_heading: Class
path: metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor
---

# MTLAccelerationStructureMotionTriangleGeometryDescriptor

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

## Declaration

```swift
class MTLAccelerationStructureMotionTriangleGeometryDescriptor
```

## Mentioned in

Improving ray-tracing data access using per-primitive data

## Topics

### Specifying the number of triangles

- [triangleCount](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/trianglecount.md)

### Specifying index data

- [indexBuffer](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/indexbuffer.md)
- [indexType](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/indextype.md)
- [indexBufferOffset](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/indexbufferoffset.md)

### Specifying vertex data

- [vertexBuffers](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/vertexbuffers.md)
- [vertexStride](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/vertexstride.md)

### Instance Properties

- [transformationMatrixBuffer](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/transformationmatrixbuffer.md)
- [transformationMatrixBufferOffset](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/transformationmatrixbufferoffset.md)
- [transformationMatrixLayout](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/transformationmatrixlayout.md)
- [vertexFormat](metal/mtlaccelerationstructuremotiontrianglegeometrydescriptor/vertexformat.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)
- [MTL4AccelerationStructureMotionCurveGeometryDescriptor](metal/mtl4accelerationstructuremotioncurvegeometrydescriptor.md)
- [MTLAccelerationStructureMotionCurveGeometryDescriptor](metal/mtlaccelerationstructuremotioncurvegeometrydescriptor.md)
- [MTL4AccelerationStructureMotionBoundingBoxGeometryDescriptor](metal/mtl4accelerationstructuremotionboundingboxgeometrydescriptor.md)
- [MTLAccelerationStructureMotionBoundingBoxGeometryDescriptor](metal/mtlaccelerationstructuremotionboundingboxgeometrydescriptor.md)
- [MTLMotionKeyframeData](metal/mtlmotionkeyframedata.md)