Distance fade: fading objects pick up the sky's HDR brightness #150

New issue

Closed

opened 2026-09-29 02:16:04 +00:00 by sky_line · 0 comments

sky_line commented

2026-09-29 02:16:04 +00:00

Owner

Where

atmosDistanceFade in indra/vkclean/shaders/clean_atmos_common.glsl:

return mix(lin, skyColor(rel, false), f);

skyColor() returns the sky already multiplied by atmosHdrScale() (see its final atmosSrgbToLinear(color.rgb) * atmosHdrScale()), so a fading object is mixed toward an HDR-boosted value.

Fix direction

Fade toward the sky colour without the HDR scale (or divided back out), in the same brightness range as the lit object, so the fade reads as haze and not as a light source.
Check how bloom and the tonemapper see it: with bloom on, the boosted fade target pushes distant objects over the bloom threshold.
Compare with LL/Alchemy's distance fade behaviour for reference (the fade should match the sky at the horizon without over-brightening).
Watch water-fogged fragments, which take a separate path (applyWaterFog).

Objects fading out near the draw distance (the distance fog / object fade) blend toward the sky colour, including the sky's HDR scale. Fading objects therefore brighten, and can glow or bloom, instead of simply dissolving into the horizon. ## Where `atmosDistanceFade` in `indra/vkclean/shaders/clean_atmos_common.glsl`: ```glsl return mix(lin, skyColor(rel, false), f); ``` `skyColor()` returns the sky already multiplied by `atmosHdrScale()` (see its final `atmosSrgbToLinear(color.rgb) * atmosHdrScale()`), so a fading object is mixed toward an HDR-boosted value. ## Fix direction - Fade toward the sky colour **without** the HDR scale (or divided back out), in the same brightness range as the lit object, so the fade reads as haze and not as a light source. - Check how bloom and the tonemapper see it: with bloom on, the boosted fade target pushes distant objects over the bloom threshold. - Compare with LL/Alchemy's distance fade behaviour for reference (the fade should match the sky at the horizon without over-brightening). - Watch water-fogged fragments, which take a separate path (`applyWaterFog`).

sky_line referenced this issue

2026-09-29 03:10:57 +00:00

Vulkan: clouds are not rendered (cloud layer missing) #156

sky_line referenced this issue from a commit

2026-09-29 03:21:05 +00:00

Distance fade: below the horizon, fade into haze instead of HDR sky

sky_line closed this issue

2026-09-29 03:21:05 +00:00

sky_line referenced this issue

2026-09-29 04:52:42 +00:00

Distance fade: sim-surround sculpts and terrain don't haze when flying high #158