GunMetal-DX stage 3: physical sky (Hillaire LUTs), physical night + night eye, star catalogue + Milky Way, horizon water, cloud A/B #1208

New issue

Closed

opened 2026-10-28 16:33:54 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-28 16:33:54 +00:00

Owner

Part of #1205.

(#6) Physical sky:
- transmittance and sky-view LUTs (compute), aerial perspective, highlight roll-off, twilight floor;
- the WindLight haze amount is kept.
- Their code is interleaved with clean_atmos_common and the frame-info UBO, so port it as our own LUT pass. MIT credit for Hillaire's reference.
(#7) Physical night:
- moon phases and real moonlight strength;
- night ambient;
- night eye (exposure and vision);
- the moon disc as a light.
(#8) Night sky:
- Yale BSC5 star catalogue (real positions and colours);
- ESO Milky Way panorama: CC BY 4.0, the attribution must show in the viewer's licences screen;
- planets;
- space darkening at altitude;
- horizon water.
Merge this with our existing sky bodies and stars.
(#9) Their Wicked-Engine-based volumetric clouds (shape atlas, corona): A/B against ours, adopt the pieces that win, and keep one cloud stack.

Source: GunMetal-DX by squeedledorf (https://github.com/squeedledorf/GunMetal-DX), v0.3.0 = cf5f1f4, based on our d37288cfec. LGPL 2.1, a public release. Credit in code comments and in the About / release notes. The per-feature evaluation (local) is in research/GUNMETAL_DX_2026-10-28.md; the section 3 table numbers are quoted as (#n).

For every stage:

Port by hand onto current dev. Their base is 44+ commits behind, and the renderer files have moved on.
Strip their settings down to the few that earn a place (minimal config space). Experiment toggles are Persist=0.
Never take their custom SDL3 build (SDL3-3.4.18-gmdx1), updater, crash reporter, installer or branding.

Part of #1205. - **(#6) Physical sky:** - transmittance and sky-view LUTs (compute), aerial perspective, highlight roll-off, twilight floor; - the WindLight haze amount is kept. - Their code is interleaved with clean_atmos_common and the frame-info UBO, so port it as our own LUT pass. MIT credit for Hillaire's reference. - **(#7) Physical night:** - moon phases and real moonlight strength; - night ambient; - night eye (exposure and vision); - the moon disc as a light. - **(#8) Night sky:** - Yale BSC5 star catalogue (real positions and colours); - ESO Milky Way panorama: CC BY 4.0, the attribution must show in the viewer's licences screen; - planets; - space darkening at altitude; - horizon water. Merge this with our existing sky bodies and stars. - **(#9) Their Wicked-Engine-based volumetric clouds** (shape atlas, corona): A/B against ours, adopt the pieces that win, and keep one cloud stack. Source: GunMetal-DX by squeedledorf (https://github.com/squeedledorf/GunMetal-DX), v0.3.0 = cf5f1f4, based on our d37288cfec. LGPL 2.1, a public release. Credit in code comments and in the About / release notes. The per-feature evaluation (local) is in research/GUNMETAL_DX_2026-10-28.md; the section 3 table numbers are quoted as (#n). **For every stage:** - Port by hand onto current dev. Their base is 44+ commits behind, and the renderer files have moved on. - Strip their settings down to the few that earn a place (minimal config space). Experiment toggles are Persist=0. - Never take their custom SDL3 build (SDL3-3.4.18-gmdx1), updater, crash reporter, installer or branding.

sky_line added this to the Slipstream project

2026-10-28 16:33:54 +00:00

sky_line referenced this issue from a commit

2026-10-28 21:34:53 +00:00

Frame info: physical sky, physical night and night sky blocks (#1208)

sky_line referenced this issue from a commit

2026-10-28 21:34:53 +00:00

Physical sky: Hillaire transmittance / multiple-scattering / sky-view LUTs, aerial perspective, highlight roll-off (#1208)

sky_line referenced this issue from a commit

2026-10-28 21:34:53 +00:00

Horizon water: open sea to the horizon past the draw distance; fade haze in the HDR range (#1208)

sky_line referenced this issue from a commit