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feat(render3d): replace the world at run time, water bodies, terrain_sea

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terrain_reload/terrain_unload release one map's height field, survey, photograph
and patch bounds and generate another at any TERRAIN_HALF; scatter_clear_all
(with streams), actor_clear_all, col_reset and mesh_free empty the scene;
water_body_add/water_bodies_clear draw several still-water planes with one
reflecting; terrain_sea separates the coast's sea level from the carved lake's,
and grass keeps off both. Fixes CDLOD patch bounds for TERRAIN_HALF != 4096 and
water_init leaking a mesh and program per call. examples/rendering/reload.ludic.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-13 00:03:40 +03:00
parent 70bda0c4df
commit a4a3d75cd9
13 changed files with 308 additions and 19 deletions
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7
packages/ludic.render3d/shaders/terrain.frag
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@ -18,6 +18,7 @@ uniform sampler2D u_snow_d; uniform sampler2D u_carpet; // the clump cards ba
uniform float u_carpet_on;
uniform float u_snow_line;
uniform float u_lake_level; // the ground just above the water is wet and dark
uniform float u_sea_level; // the sea's line: shore, forest and scree gates (terrain_sea)
uniform vec2 u_origin; // world offset of the terrain grid
// The ground's own sun shadow comes from the baked height-field map (tershadow.frag),
@ -236,14 +237,14 @@ vec3 groundShade(vec3 p, vec3 N, float slope, float dist, float viewDepth, bool
vec3 ocf = textureLod(u_ortho, v_huv, 2.0).rgb;
float gx = ocf.g - max(ocf.r, ocf.b);
// (the photograph is sampled linear: sRGB 72 is 0.06, 92 is 0.11)
forestW = smoothstep(0.12, 0.06, max(ocf.r, max(ocf.g, ocf.b))) * smoothstep(0.004, 0.012, gx) * smoothstep(u_lake_level + 0.8, u_lake_level + 1.8, p.y);
forestW = smoothstep(0.12, 0.06, max(ocf.r, max(ocf.g, ocf.b))) * smoothstep(0.004, 0.012, gx) * smoothstep(u_sea_level + 0.8, u_sea_level + 1.8, p.y);
// Classify from a ~60 m blur, never from the pixels: the survey's 10 m pixels carry
// a foot trail as a broken line of bare ground, and thresholding them painted it
// across the meadow as tan dashes (and, on the CPU, lined boulders up along it).
vec3 ocl = textureLod(u_ortho, v_huv, 2.5).rgb;
float mxc = max(ocl.r, max(ocl.g, ocl.b)), mnc = min(ocl.r, min(ocl.g, ocl.b));
float greenEx = ocl.g - max(ocl.r, ocl.b);
screeC = smoothstep(0.008, -0.002, greenEx) * smoothstep(0.06, 0.12, mxc) * (1.0 - smoothstep(0.55, 0.75, mxc)) * smoothstep(u_lake_level + 0.2, u_lake_level + 1.2, p.y);
screeC = smoothstep(0.008, -0.002, greenEx) * smoothstep(0.06, 0.12, mxc) * (1.0 - smoothstep(0.55, 0.75, mxc)) * smoothstep(u_sea_level + 0.2, u_sea_level + 1.2, p.y);
snowC = smoothstep(0.08, 0.04, mxc - mnc) * smoothstep(0.55, 0.8, mxc);
}
// snow lingering in the high gullies is drawn further down, but whether it can be
@ -362,7 +363,7 @@ vec3 groundShade(vec3 p, vec3 N, float slope, float dist, float viewDepth, bool
// the bank here: identical noise fields, identical time, identical phase, keyed off
// height above the lake instead of depth below it. Across the seam the two agree, so
// there is nothing there to read as an edge.
float above = p.y - u_lake_level; // >0 on land, metres
float above = p.y - u_sea_level; // >0 on land, metres
// wet ground: darker and glossier near the water, fading out over ~1.2 m
float wet = smoothstep(1.2, 0.0, above);
alb *= mix(1.0, 0.5, wet * 0.85);