# getFocalLength

Source: https://www.nianticspatial.com/docs/api/kotlin/com.nianticspatial.nsdk.CameraIntrinsics.getFocalLength/

getFocalLength

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## Declaration

open fun getFocalLength(): FloatArray

#### Summary

Returns the camera's focal length in pixels.

The focal length is conventionally represented in pixels. For a detailed explanation, please
see
[Disecting the Camera Matrix, Part 3: The Intrinsic Matrix](https://ksimek.github.io/2013/08/13/intrinsic).
Pixels-to-meters conversion can use SENSOR_INFO_PHYSICAL_SIZE and
SENSOR_INFO_PIXEL_ARRAY_SIZE in the Android Characteristics API.

#### Returns

a float[2] containing the focal length. The order of values is {fx, fy}.

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## Overload

open fun getFocalLength(focalLength: FloatArray?, offset: Int)

#### Summary

Returns the camera's focal length in pixels.

The focal length is conventionally represented in pixels. For a detailed explanation, please
see
[Disecting the Camera Matrix, Part 3: The Intrinsic Matrix](https://ksimek.github.io/2013/08/13/intrinsic).
Pixels-to-meters conversion can use SENSOR_INFO_PHYSICAL_SIZE and
SENSOR_INFO_PIXEL_ARRAY_SIZE in the Android Characteristics API.

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