---
title: MPSInstanceAccelerationStructure
framework: metalperformanceshaders
role: symbol
role_heading: Class
path: metalperformanceshaders/mpsinstanceaccelerationstructure
---

# MPSInstanceAccelerationStructure

An acceleration structure built over instances of other acceleration structures.

## Declaration

```swift
class MPSInstanceAccelerationStructure
```

## Topics

### Instance Properties

- [accelerationStructures](metalperformanceshaders/mpsinstanceaccelerationstructure/accelerationstructures.md)
- [instanceBuffer](metalperformanceshaders/mpsinstanceaccelerationstructure/instancebuffer.md)
- [instanceBufferOffset](metalperformanceshaders/mpsinstanceaccelerationstructure/instancebufferoffset.md)
- [instanceCount](metalperformanceshaders/mpsinstanceaccelerationstructure/instancecount.md)
- [maskBuffer](metalperformanceshaders/mpsinstanceaccelerationstructure/maskbuffer.md)
- [maskBufferOffset](metalperformanceshaders/mpsinstanceaccelerationstructure/maskbufferoffset.md)
- [transformBuffer](metalperformanceshaders/mpsinstanceaccelerationstructure/transformbuffer.md)
- [transformBufferOffset](metalperformanceshaders/mpsinstanceaccelerationstructure/transformbufferoffset.md)
- [transformType](metalperformanceshaders/mpsinstanceaccelerationstructure/transformtype.md)

## Relationships

### Inherits From

- [MPSAccelerationStructure](metalperformanceshaders/mpsaccelerationstructure.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSCopying](foundation/nscopying.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSecureCoding](foundation/nssecurecoding.md)

## See Also

### Ray Tracing

- [Accelerating ray tracing and motion blur using Metal](metal/accelerating-ray-tracing-and-motion-blur-using-metal.md)
- [MPSRayIntersector](metalperformanceshaders/mpsrayintersector.md)
- [MPSAccelerationStructureGroup](metalperformanceshaders/mpsaccelerationstructuregroup.md)
- [MPSTriangleAccelerationStructure](metalperformanceshaders/mpstriangleaccelerationstructure.md)
- [MPSAccelerationStructure](metalperformanceshaders/mpsaccelerationstructure.md)