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feat(render3d): a bole that does not quake, leaves out of the lens, a light with a reach

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layer_flutter's mask was the vertex's height alone, so on a ten metre aspen every part of
the trunk above 1.2 m trembled with the leaves and the bole read as cloth. What separates
a leaf from a bole is distance from the model's centre line, not height; the mask is
radial now, and small plants keep the old one because a flower is all leaf.

NEAR_FADE dithers tree foliage out inside arm's length of the camera, in the depth
prepass, so the lit pass never sees those pixels and the equal-depth optimisation is
untouched. gl_Position.w is the view depth, so it costs one varying and no uniform.
Blades, cards and flowers are excluded - they live at the player's feet - and the shadow
pass keeps every leaf.

daylight_hand takes a reach in metres. The falloff was an inverse square windowed between
26 and 6 with both numbers hard-coded: two per cent of its own near field at ten metres,
so a torch lit your boots. It is a gentle power out to the reach now.

Measured in Maroon Lake, twice per side: the crown mask moves 1.7% of an aspen frame and
nothing at all in the meadow under it; the near fade moves 7.1% of a first-person frame
at a conifer and 0% where there is no foliage in the lens; the torch's reach lifts the lit
ground 20 to 45% and leaves the sky bit-identical.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-20 00:05:22 +03:00
parent a88aecb993
commit 18d23ca20d
8 changed files with 97 additions and 8 deletions
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6
packages/ludic.render3d/scatter.ludic
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@ -364,9 +364,9 @@ function scatter_init() -> void {
# R3D_DUMP_ATLAS: every impostor and card atlas the run bakes, to build/atlas_<n>_{color,alpha}.ppm
sc_debug_dump = r3d_env_has("R3D_DUMP_ATLAS")
sc_prog = r3d_program("model.vert", "model.frag", "")
sc_prog_fol = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n")
sc_prog_fol_depth = r3d_program("model.vert", "depth.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n")
sc_prog_fol_eq = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define EQ_PASS\n")
sc_prog_fol = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n#define NEAR_FADE\n")
sc_prog_fol_depth = r3d_program("model.vert", "depth.frag", "#define FOLIAGE\n#define WIND\n#define ALPHA_TEST\n#define NEAR_FADE\n")
sc_prog_fol_eq = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define EQ_PASS\n#define NEAR_FADE\n")
sc_prog_wind = r3d_program("model.vert", "model.frag", "#define WIND\n")
sc_prog_blade = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define BLADE\n")
sc_prog_flower = r3d_program("model.vert", "model.frag", "#define FOLIAGE\n#define WIND\n#define FLOWER\n")