What would this enhancement be for?
Rendering
Describe your enhancement suggestion in more detail
actually parallax corrected cubemaps only work for brush, which actually reflection aren't consistent between models and brush, so in certain scene actually it's can break the "immersion" when you look at the reflection
here one exemple of a source mod using parallaxx corrected cubemaps (from operation black mesa)
https://www.youtube.com/watch?v=qhFy9rORkbM