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# sphericalHarmonicsCoefficients

Data describing the estimated lighting environment in all directions for a light probe.

```
var sphericalHarmonicsCoefficients: Data { get }
```

## Discussion

Spherical harmonic coefficients describe the distribution of light around a point in a format that can be used efficiently in real-time rendering. SceneKit supports spherical harmonics only for lights of the [`probe`](/documentation/SceneKit/SCNLight/LightType/probe) type.

The data is an 32-bit floating-point values, containing three noninterleaved data sets corresponding to the red, green, and blue sets of coefficients. SceneKit supports only level 2 spherical harmonics, so the array has 3 sets of 9 values, or 27 values total.

## See Also

  <doc://com.apple.documentation/documentation/ARKit/ARDirectionalLightEstimate>

  <doc://com.apple.documentation/documentation/ModelIO/MDLLightProbe>


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