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fix(render3d): the meadow is vegetation, and still water reads as water

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Two changes that have been sitting uncommitted in this checkout, gathered as a recovery
point before the next run of work.

grass.vert: the blade existence gate tested green DOMINANCE - g - max(r, b) - which is a
test for lush green and nothing else. A dry alpine meadow is yellow-green, its red as high
as its green, so the meadow scored zero and was thinned to the floor - a QUARTER of the
blades - on exactly the ground that should be thickest. Measured on Maroon's own ortho,
g - max(r, b) reads +0.026 at the camp and -0.002 six hundred metres away, flipping between
full density and a quarter over continuous meadow; g - b reads +0.076 and +0.014 and
separates plant from rock and snow just as well, because rock and snow are neutral and
vegetation is not. Bare ground in the near band went 82% -> 57% looking down.

Blade height is biased short (h3 * h3) rather than spread evenly, so a meadow is a dense
mat with taller stems out of it; an even spread read as a lawn that had been cut.

water.frag: the planar reflection is returned at 0.72 of the scene's exposure rather than
all of it, the fresnel mix caps at 0.70 rather than 0.86, absorption falls so the bed is
visible through the surface at the angles a player stands at, and the ripple field is
roughly halved - so a sheltered lake is one sheet of water with a mountain in it instead
of open chop to the horizon.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-19 18:07:01 +03:00
parent ae52e9c4da
commit c5693db0e4
3 changed files with 63 additions and 13 deletions
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@ -0,0 +1,12 @@
bump: patch
type: fix
Still water reads as water rather than polished metal. The planar reflection is
returned at 0.72 of the scene's own exposure instead of all of it, the fresnel mix
is capped at 0.70 rather than 0.86, and absorption falls from `(0.55, 0.24, 0.14)`
to `(0.34, 0.15, 0.09)` per metre - so the bed is visible through the surface at the
angles a player actually stands at, and a clear lake stops going opaque a metre and a
half down. The ripple field is roughly halved and its normals flattened further
(slope 0.26 -> 0.15), the reflection's ripple nudge halved with it, and the surface
goes flat by 400 m rather than 600, so a sheltered lake is one sheet of water with a
mountain in it instead of open chop to the horizon. Sun glitter and wind-streak foam
come down to match.