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# extendedLimits

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

```
static var extendedLimits: MTLAccelerationStructureUsage { get }
```

## Discussion

The acceleration structures you build with this option can affect their performance
because they support more data complexity.

|                                              |Standard limits|Extended limits|
|----------------------------------------------|---------------|---------------|
|Primitives in primitive acceleration structure|`2^(28)`       |`2^(30)`       |
|Geometries in primitive acceleration structure|`2^(24)`       |`2^(30)`       |
|Instances in instance acceleration structure  |`2^(24)`       |`2^(30)`       |
|Visibility mask bits                          |`8`            |`32`           |

---

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