From b8cfee6d08a9ac27131be8950277700f86fd4d0d Mon Sep 17 00:00:00 2001
From: Erik <erik.nihlen@gmail.com>
Date: Sun, 23 Aug 2026 18:00:28 +0200
Subject: [PATCH] =?UTF-8?q?fix(sky):=20seamless=20night-sky=20star=20latti?=
 =?UTF-8?q?ce=20=E2=80=94=20no=20face=20seams,=20no=20flare,=20round=20pix?=
 =?UTF-8?q?el-exact=20stars?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The first night-sky gate (2026-08-23 screenshot) showed three defects:
glowing beams along the cube-face boundaries (fwidth blowup where
adjacent pixels land on different faces lights every neighbourhood star
solid), diffraction-spiked standouts the user rejects ('that is in a
photo only, not in real sky'), and ellipse-stretched stars from scalar
length(fwidth) sizing at oblique view angles.

One rewrite removes all three: stars now live on a seamless 3D lattice
over the unit sphere (no faces, so no seams by construction), each star
resolved through an exact tangent-plane -> screen-pixel 2x2 solve of
the direction derivatives (perfectly round, true pixel sizing at every
view angle, sharper cores), spikes deleted in favour of a soft round
halo on the bright tiers. Guard test updated to pin the new anchors and
forbid both fwidth-face grids and spikes; sky.frag.spv re-pinned.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 src/AcDream.App/Rendering/Shaders/sky.frag    |  90 ++++++++++--------
 .../Shaders/spv/shaders.manifest.json         |   2 +-
 .../Rendering/Shaders/spv/sky.frag.spv        | Bin 23624 -> 26316 bytes
 .../Gpu/Vk/VulkanShaderManifestTests.cs       |   2 +-
 .../Sky/EnhancedNightSkyRuleTests.cs          |  10 +-
 5 files changed, 58 insertions(+), 46 deletions(-)

diff --git a/src/AcDream.App/Rendering/Shaders/sky.frag b/src/AcDream.App/Rendering/Shaders/sky.frag
index b84dda24..db25c71e 100644
--- a/src/AcDream.App/Rendering/Shaders/sky.frag
+++ b/src/AcDream.App/Rendering/Shaders/sky.frag
@@ -108,60 +108,65 @@ float nsVnoise(vec3 p, uint seed)
     return acc;
 }
 
-vec3 nsStars(vec2 fuv, uint faceSeed, float cells, float density,
-             float bMin, float bMax, float sizePx, bool spikes)
+vec3 nsStarTier(vec3 dir, vec3 ex, vec3 ey, uint seed, float cells,
+                float density, float bMin, float bMax, float sizePx,
+                float haloAmp)
 {
-    vec2 g = fuv * cells;
-    vec2 cellF = floor(g);
-    // Screen pixels per cell-space unit: the crispness anchor.
-    float pxPerCell = 1.0 / max(length(fwidth(g)), 1e-6);
+    // Seamless 3D lattice on the unit sphere: no face boundaries, so no
+    // seam artefacts by construction (the 2026-08-23 gate screenshot's
+    // glowing "Y" was cube-face fwidth blowup — do not bring faces back).
+    vec3 g = dir * cells;
+    vec3 cellF = floor(g);
+
+    // Exact tangent-plane -> screen-pixel solve: 2x2 normal equations of
+    // the direction derivatives. Stars come out perfectly ROUND and sized
+    // in true screen pixels at every view angle — a length(fwidth(...))
+    // scalar stretches them into ellipses at oblique angles.
+    float a = dot(ex, ex);
+    float b = dot(ex, ey);
+    float c = dot(ey, ey);
+    float det = max(a * c - b * b, 1e-14);
+
     vec3 acc = vec3(0.0);
+    for (int dz = -1; dz <= 1; ++dz)
     for (int dy = -1; dy <= 1; ++dy)
     for (int dx = -1; dx <= 1; ++dx)
     {
-        vec2 c = cellF + vec2(float(dx), float(dy));
-        uint h = nsPcg(faceSeed
-            ^ nsPcg(uint(int(c.x) + 512)
-            ^ nsPcg(uint(int(c.y) + 512)
-            ^ uint(cells))));
+        vec3 cc = cellF + vec3(float(dx), float(dy), float(dz));
+        uint h = nsPcg(seed
+            ^ nsPcg(uint(int(cc.x) + 512)
+            ^ nsPcg(uint(int(cc.y) + 512)
+            ^ nsPcg(uint(int(cc.z) + 512) ^ uint(cells)))));
         if (nsRand(h) > density) continue;
         uint h2 = nsPcg(h);
         uint h3 = nsPcg(h2);
         uint h4 = nsPcg(h3);
         uint h5 = nsPcg(h4);
-        vec2 pos = c + vec2(nsRand(h2), nsRand(h3));
-        float t = nsRand(h4);
-        float b = mix(bMin, bMax, t * t * t);
-        vec3 tint = nsTint(nsRand(h5));
-        vec2 dPx = (g - pos) * pxPerCell;
-        float d2 = dot(dPx, dPx);
+        uint h6 = nsPcg(h5);
+        vec3 sdir = normalize(cc + vec3(nsRand(h2), nsRand(h3), nsRand(h4)));
+        vec3 v = sdir - dir * dot(sdir, dir);   // tangent-plane offset
+        float bx = dot(v, ex);
+        float by = dot(v, ey);
+        vec2 sPx = vec2(bx * c - by * b, by * a - bx * b) / det;
+        float d2 = dot(sPx, sPx);
+        if (d2 > 400.0) continue;               // > 20 px: contributes nothing
+        float t = nsRand(h5);
+        float br = mix(bMin, bMax, t * t * t);
+        vec3 tint = nsTint(nsRand(h6));
+        // Round gaussian core; optional soft round halo on the bright tiers.
+        // NO diffraction spikes / lens flare — user-directed 2026-08-23:
+        // spikes are a photographic artefact, not a naked-eye sky.
         float star = exp(-d2 / (2.0 * sizePx * sizePx));
-        if (spikes)
-        {
-            // Axis-aligned diffraction cross + soft halo for the standouts.
-            float dist = sqrt(d2) + 1e-4;
-            float fall = exp(-dist / (14.0 * sizePx));
-            float arm = exp(-dPx.y * dPx.y * 0.8) + exp(-dPx.x * dPx.x * 0.8);
-            star += 0.35 * fall * arm;
-            star += 0.10 * exp(-d2 / (18.0 * sizePx * sizePx));
-        }
-        acc += b * tint * star;
+        star += haloAmp * exp(-d2 / (24.0 * sizePx * sizePx));
+        acc += br * tint * star;
     }
     return acc;
 }
 
 vec3 nightSky(vec3 dir, uint seed)
 {
-    // Cube-face parameterisation: uniform angular density, no pole pinch.
-    // Face-edge star continuity is not exact (adjacent faces hash their own
-    // grids); the sub-pixel population makes any seam visually negligible.
-    vec3 ad = abs(dir);
-    uint face; vec2 fuv; float ma;
-    if (ad.z >= ad.x && ad.z >= ad.y) { face = dir.z > 0.0 ? 4u : 5u; ma = ad.z; fuv = dir.xy; }
-    else if (ad.x >= ad.y)            { face = dir.x > 0.0 ? 0u : 1u; ma = ad.x; fuv = dir.yz; }
-    else                              { face = dir.y > 0.0 ? 2u : 3u; ma = ad.y; fuv = dir.xz; }
-    fuv = fuv / ma * 0.5 + 0.5;
-    uint fs = nsPcg(seed ^ (face * 0x9E3779B9u));
+    vec3 ex = dFdx(dir);
+    vec3 ey = dFdy(dir);
 
     // Faint cool background mottle (0.4%..1.3% - the user-approved level).
     float n = 0.55 * nsVnoise(dir * 3.0, seed ^ 0x9E3779B9u)
@@ -169,11 +174,12 @@ vec3 nightSky(vec3 dir, uint seed)
             + 0.15 * nsVnoise(dir * 15.0, seed ^ 0xC2B2AE35u);
     vec3 rgb = (0.004 + 0.009 * n) * vec3(0.85, 0.92, 1.10);
 
-    // The star carpet: three density tiers plus sparse spiked standouts.
-    rgb += nsStars(fuv, fs, 160.0, 0.90, 0.05, 0.35, 0.55, false);
-    rgb += nsStars(fuv, fs, 64.0, 0.50, 0.20, 0.70, 0.75, false);
-    rgb += nsStars(fuv, fs, 24.0, 0.35, 0.50, 1.40, 1.05, false);
-    rgb += nsStars(fuv, fs, 6.0, 0.10, 2.00, 4.00, 1.80, true);
+    // The star carpet: three density tiers plus sparse bright standouts,
+    // all crisp round points (see nsStarTier).
+    rgb += nsStarTier(dir, ex, ey, seed ^ 0x1B873593u, 110.0, 0.85, 0.05, 0.35, 0.50, 0.0);
+    rgb += nsStarTier(dir, ex, ey, seed ^ 0xCC9E2D51u, 48.0, 0.45, 0.20, 0.70, 0.65, 0.0);
+    rgb += nsStarTier(dir, ex, ey, seed ^ 0x27D4EB2Fu, 18.0, 0.30, 0.50, 1.40, 0.90, 0.05);
+    rgb += nsStarTier(dir, ex, ey, seed ^ 0x165667B1u, 6.0, 0.08, 2.00, 4.00, 1.40, 0.10);
     return rgb;
 }
 // ============================================================================
diff --git a/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json b/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
index 7067f074..1029e342 100644
--- a/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
+++ b/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
@@ -316,7 +316,7 @@
         },
         {
           "stage": "frag",
-          "sourceSha256": "bf5bc353959636b1c80a9f72dc918cffdd33fb6b7b655149de40422030b4f51a",
+          "sourceSha256": "a6efd09f396b17ae6a19ffc4be400ac9b035056cbad26aee3447459cd98341f0",
           "compiled": true
         }
       ]
diff --git a/src/AcDream.App/Rendering/Shaders/spv/sky.frag.spv b/src/AcDream.App/Rendering/Shaders/spv/sky.frag.spv
index df2533c57dd54426bc2df225cd14e181535fb212..54f0a5690a91c24962d27f36fd695dafe14fd2ff 100644
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diff --git a/tests/AcDream.App.Tests/Rendering/Gpu/Vk/VulkanShaderManifestTests.cs b/tests/AcDream.App.Tests/Rendering/Gpu/Vk/VulkanShaderManifestTests.cs
index 11d417a6..4a1a467a 100644
--- a/tests/AcDream.App.Tests/Rendering/Gpu/Vk/VulkanShaderManifestTests.cs
+++ b/tests/AcDream.App.Tests/Rendering/Gpu/Vk/VulkanShaderManifestTests.cs
@@ -52,7 +52,7 @@ public sealed class VulkanShaderManifestTests
             // override, retail's GameSky::Draw @0x00506FF0 rule (see
             // SkyFogRuleTests). A deliberate default-path change, reviewed
             // with the world-fog-range fix in the same commit.
-            ["sky.frag.spv"] = "8105984072fc1b9075b5efdffd75d959c4087710d354d50a0e00ee0500462ca7",
+            ["sky.frag.spv"] = "2d2de4080c7f4b0885aee4441e37a1725d3f30661b45773bcb39383674b1718b",
             ["sky.vert.spv"] = "3b51945fa4ff1be1604144df92866bdd47aade22f9dd90267591ef36adb28cde",
             ["terrain_modern.frag.spv"] = "7b3cdb01b837ed77ee20559a81c1ce5c9d5395300efcc072560ab0be3c5a1af9",
             ["terrain_modern.vert.spv"] = "9f4cb221ea6aed94a8d23af6cb8e3f3ed96c3cce6e50d135a72d3b55667b1557",
diff --git a/tests/AcDream.App.Tests/Rendering/Sky/EnhancedNightSkyRuleTests.cs b/tests/AcDream.App.Tests/Rendering/Sky/EnhancedNightSkyRuleTests.cs
index 0909720c..48ad7a82 100644
--- a/tests/AcDream.App.Tests/Rendering/Sky/EnhancedNightSkyRuleTests.cs
+++ b/tests/AcDream.App.Tests/Rendering/Sky/EnhancedNightSkyRuleTests.cs
@@ -23,8 +23,14 @@ public sealed class EnhancedNightSkyRuleTests
         Assert.Contains("if (uParamA > 0.5)", code, StringComparison.Ordinal);
         Assert.Contains("nightSky(normalize(vDir), uint(uParamB))", code, StringComparison.Ordinal);
         // Screen-pixel star sizing is the reason this exists — the stretched
-        // texture flaw must not creep back in via a fixed-size grid.
-        Assert.Contains("fwidth(g)", code, StringComparison.Ordinal);
+        // texture flaw must not creep back in via a fixed-size grid, and the
+        // cube-face fwidth seams must not return (the 2026-08-23 gate's
+        // glowing "Y"): the crispness anchor is the seamless 3D-lattice
+        // tangent-plane solve on the direction derivatives.
+        Assert.Contains("dFdx(dir)", code, StringComparison.Ordinal);
+        Assert.DoesNotContain("fwidth(g)", code, StringComparison.Ordinal);
+        // No diffraction spikes — user-directed: flare is photographic.
+        Assert.DoesNotContain("spike", code, StringComparison.OrdinalIgnoreCase);
     }
 
     [Fact]