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Enlighten UE4 3.09 Documentation
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  • Welcome to Enlighten
  • How Enlighten works
  • Install and build
  • Beginner tutorials
  • From static to dynamic lighting
  • How actors interact with Enlighten
  • Lightmap lighting
  • Probe lighting
  • Local reflections
  • Change the lighting resolution
  • World properties
  • Level properties
  • Precompute your level
  • Enlighten light properties
  • Light reflected from the sky
  • Material properties
  • Turn off Enlighten updates in game
  • Mesh destruction
  • LOD for lighting
  • Real-world sun/sky intensity
  • Collaborate on a level
  • Reserved texture samplers
  • Visualizations and statistics
  • Debug with Enlighten tools
  • Convert to vanilla UE4
  • Troubleshooting and support
  • Third-party licences
  • Release notes
    Calendars
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Real-world sun/sky intensity

    This is the documentation for Enlighten.

    Real-world sun/sky intensity

    Oct 10, 2019

    This is an experimental option, and is currently only functional on D3D11, D3D12, PS4 and Xbox One.

    In a level with a directional light with an Intensity of above 16, or a sky light with Intensity above 1000, you may notice darker-than-expected indirect lighting with Enlighten lightmaps. This is because Enlighten lightmaps in UE4 are stored with a fixed-point HDR representation.

    Real-world values for sunlight may require an intensity of around 2000. In this scenario, Enlighten indirect lighting looks dark and flat.

    To fix this, you can enable experimental floating-point HDR lightmaps, which:

    • display much greater range of values while preserving precision where it's most needed
    • don't require additional memory
    • don't significantly affect GPU or CPU overhead

    To enable the floating point pixel format for the irradiance lightmap:

    1. In your project's DefaultEngine.ini, add the line:

       r.Enlighten.LightmapPixelFormat=1
    2. Restart the editor.



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