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# MTLAccelerationStructureInstanceOptions

Options for adjusting the behavior of an instanced acceleration structure.

```
struct MTLAccelerationStructureInstanceOptions
```

## Topics

### Creating instance flags

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

Creates new usage options from a raw integer value.

### Usage options

[`MTLAccelerationStructureInstanceOptionNone`](/documentation/Metal/MTLAccelerationStructureInstanceOptions/MTLAccelerationStructureInstanceOptionNone)

Specifies the default behavior for resulting acceleration structure.

[`disableTriangleCulling`](/documentation/Metal/MTLAccelerationStructureInstanceOptions/disableTriangleCulling)

An option that turns off culling for this instance if ray intersector has culling enabled.

[`triangleFrontFacingWindingCounterClockwise`](/documentation/Metal/MTLAccelerationStructureInstanceOptions/triangleFrontFacingWindingCounterClockwise)

Specifies that the instance specifies front facing triangles in counter-clockwise order.

[`opaque`](/documentation/Metal/MTLAccelerationStructureInstanceOptions/opaque)

Specifies that intersectors should treat the instance as opaque.

[`nonOpaque`](/documentation/Metal/MTLAccelerationStructureInstanceOptions/nonOpaque)

Specifies that intersectors should treat the instance as non-opaque.


---

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