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# PhotogrammetrySession.Request.Detail.custom

A custom quality for the model, with specifics defined by the photogrammetry session.

```
case custom
```

## Discussion

If you select `.custom`, you can define unique detail parameters by configuring the session with a
[`PhotogrammetrySession.Configuration.CustomDetailSpecification`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/CustomDetailSpecification-swift.struct)
instance in a
[`customDetailSpecification`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/customDetailSpecification-swift.property).
The configuration lets you precisely control the model’s detail level, processing efficiency, and output file size
by adjusting properties such as
[`maximumPolygonCount`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/CustomDetailSpecification-swift.struct/maximumPolygonCount),
[`textureFormat`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/CustomDetailSpecification-swift.struct/textureFormat-swift.property),
and more.

> Note: ``doc://com.apple.RealityKit/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/customDetailSpecification-swift.property`` will be applied to every ``doc://com.apple.RealityKit/documentation/RealityKit/PhotogrammetrySession/Request`` that specifies a `.custom` detail in this session.  It has no effect on the other levels.

---

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