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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.

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

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

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

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

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

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

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

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

[`extendedLimits`](/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.


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