---
title: MDLProbePlacement.irradianceDistribution
framework: modelio
role: symbol
role_heading: Case
path: modelio/mdlprobeplacement/irradiancedistribution
---

# MDLProbePlacement.irradianceDistribution

An option to examine the lighting conditions at various positions in the scene being evaluated, then place light probes only at the locations where each contributes optimally to scene lighting.

## Declaration

```swift
case irradianceDistribution
```

## Discussion

Discussion If you use this heuristic, your data source must implement the sphericalHarmonicsCoefficients(atPosition:) method.

## See Also

### Constants

- [MDLProbePlacement.uniformGrid](modelio/mdlprobeplacement/uniformgrid.md)