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# featureSensitivity

The precision of landmark detection.

```
var featureSensitivity: PhotogrammetrySession.Configuration.FeatureSensitivity
```

## Discussion

The photogrammetry process relies on finding identifiable landmarks in the overlap
between images. Landmarks can be hard to identify if the images don’t have enough
contrast, aren’t in focus, or if the object is all one color and lacks surface detail.

When [`featureSensitivity`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/featureSensitivity-swift.property)
is set to [`PhotogrammetrySession.Configuration.FeatureSensitivity.high`](/documentation/RealityKit/PhotogrammetrySession/Configuration-swift.struct/FeatureSensitivity-swift.enum/high),
it instructs RealityKit to search an image for landmarks using an algorithm that
analyzes an image closely and in detail. This slower, more sensitive process can
produce an accurate 3D object even when landmarks are difficult to discern.

---

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