RTXDI Indirect Lighting in Lumen does not capture SkyAtmosphere or sky reflections in NVRTX 5.6.1

Gaming and Visualization Technologies Engines Unreal
1

Hi everyone, I’m testing NVRTX 5.6.1 in the ZORAH demo with an RTX 5090.

When I enable “Use RTXDI Indirect Lighting in Lumen”:

  • The SkyAtmosphere and sky disappear from reflections on reflective materials.

  • Indirect lighting on meshes still works normally.

When I disable this option, the sky reappears in reflections.

It seems like RTXDI does not capture SkyAtmosphere or volumetric fog in 5.6, but I’d like to confirm:

  • Has anyone else experienced this behavior?

  • Is there any setting that allows RTXDI to capture sky/atmosphere?

  • Or is this only expected to be fixed in future NVRTX/UE5 releases?

I’m trying to understand if this is a bug, a known limitation, or if there’s a recommended workaround.

Use RTXDI Indirect Lighting in Lumen OFF

Use RTXDI Indirect Lighting in Lumen ON