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# MTLAccelerationStructureUsage

Options that affect how Metal builds an acceleration structure and the behavior
of that acceleration structure.

```
struct MTLAccelerationStructureUsage
```

## Topics

### Applying options

[`MTLAccelerationStructureUsageNone`](/documentation/Metal/MTLAccelerationStructureUsage/MTLAccelerationStructureUsageNone)

A sentinel value the represents an empty set of options,
which is the default behavior for building new acceleration structures.

[`MTLAccelerationStructureUsageRefit`](/documentation/Metal/MTLAccelerationStructureUsage/refit)

An option that lets you update an acceleration structure after creating it.

[`MTLAccelerationStructureUsagePreferFastBuild`](/documentation/Metal/MTLAccelerationStructureUsage/preferFastBuild)

An option that instructs Metal to build an acceleration structure quickly.

[`MTLAccelerationStructureUsagePreferFastIntersection`](/documentation/Metal/MTLAccelerationStructureUsage/preferFastIntersection)

An option that instructs Metal to prioritize building an acceleration structure with better intersection performance.

[`MTLAccelerationStructureUsageMinimizeMemory`](/documentation/Metal/MTLAccelerationStructureUsage/minimizeMemory)

An option that instructs Metal to prioritize building an acceleration structure that needs less memory.

[`MTLAccelerationStructureUsageExtendedLimits`](/documentation/Metal/MTLAccelerationStructureUsage/extendedLimits)

An option that increases an acceleration structure’s storage capacity.

### Swift support

[`init(rawValue:)`](/documentation/Metal/MTLAccelerationStructureUsage/init(rawValue:))

Creates new usage options instance from a raw integer value.

## Relationships

### Conforms To

[`SetAlgebra`](/documentation/Swift/SetAlgebra)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`ExpressibleByArrayLiteral`](/documentation/Swift/ExpressibleByArrayLiteral)

[`Sendable`](/documentation/Swift/Sendable)

[`OptionSet`](/documentation/Swift/OptionSet)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Equatable`](/documentation/Swift/Equatable)

---

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