Rebuild Azure Odyssey Demo

Let me look at the current state of the demos folder to understand what's there. The last execution was "Continue Azure Odyssey Demo Creation" which ended with writing temp files at /tmp/az.html and needing to write remaining parts and concatenate into index.html. The current task is "Wake up" with description "Wake up and do as you please." So I have freedom to do as I please — but I should probably finish the Azure Odyssey demo since it was left incomplete, or check the state of the demos folder.

Let me install shell tools and inspect /space/demos/ first.

The temp files from the previous run are gone (tmp was wiped). I need to rebuild the Azure Odyssey demo from scratch. Let me check the existing demos to understand the style, and check what's in 009-azure-odyssey currently.

Let me look at one of the existing demos briefly to match style, then write a complete, advanced sailing demo. This is a big build. Let me plan the Azure Odyssey demo:

Azure Odyssey — Open Ocean Sailing Sandbox

Features:

1. Procedural archipelago from heightmap (baked into DataTexture)
2. Terrain mesh with vertex colors (sand/grass/rock/snow)
3. Gerstner wave ocean with custom shaders (depth color, fresnel, sun glint, foam)
4. Stylized sailboat with buoyancy physics (pitch/roll/heel)
5. Sailing model: wind direction, sail trim, rudder, autopilot between islands
6. Grounding detection in shallow water
7. Wake/bow spray particle systems (pooled, custom shaders)
8. Procedural seagulls circling islands/boat with flapping wings
9. Procedural sky dome: sun, moon, stars, clouds, day/night cycle
10. WebAudio synthesized ocean surf + wind
11. Input: WASD/arrows rudder+sails, C camera, A autopilot, M sound
12. Camera modes: chase/orbit/cinematic + mouse drag orbit + wheel zoom
13. lil-gui controls
14. HUD (speed, heading, wind, depth, FPS)
15. Snapshot PNG button
16. Post-processing: bloom + vignette
17. Responsive resize, quality scaling

That's a huge single file. I need to write it in chunks to /space/demos/009-azure-odyssey/index.html. Since the /space mount may be slow, I'll write to local /tmp first in parts, then concatenate and copy to /space.

Actually the instructions say to prefer batch operations with /space. I'll build in /tmp and copy once complete.

Let me check what Three.js version/CDN existing demos use.

The existing 009-azure-odyssey/index.html is a partial file (15,821 bytes) ending mid-heightmap code. I need to rebuild it completely. The file ends without closing HTML — it's the partial from the earlier run.

Plan: Build the complete Azure Odyssey demo in /tmp in chunks, concatenate, then copy to /space/demos/009-azure-odyssey/index.html, and update /space/demos/index.html to include the 009 card.

Let me check the index page to see if 009 is already listed.

Now I have full context:

• Demos use three@0.160.0 via jsdelivr importmap.
• Index page lists demos newest-first; 009 is NOT listed yet.
• 009-azure-odyssey/index.html exists but is a partial (15KB, ends mid-heightmap).

I will rebuild the entire Azure Odyssey demo. It's a big file (~60-80KB). I'll write it in parts to /tmp/az/ and concatenate, then copy to /space.

Let me design the full demo carefully. Key technical decisions:

Architecture (single self-contained index.html):

• importmap: three 0.160.0 + addons (OrbitControls not needed since custom camera; but EffectComposer for bloom — use UnrealBloomPass, plus a vignette via CSS or ShaderPass). lil-gui via CDN importmap entry "lil-gui" -> https://cdn.jsdelivr.net/npm/lil-gui@0.19.2/dist/lil-gui.esm.js

World:

• WORLD_SIZE = 2400 (meters), HM_RES = 512 heightmap baked asynchronously from analytic height function (value-noise fBm islands + radial falloff shaping an archipelago). Height in meters; sea level at 0; islands up to ~60m.
• Islands defined as several gaussian-blob centers plus fBm detail. Bake into Float32Array; height(x,z) sampled bilinear.

Ocean:

• Gerstner waves: 6-8 components in vertex shader. Near-field grid 256x256 covering ~500m that follows camera (snapped to wave-length multiples to avoid swimming). Far skirt: big ring/plane out to horizon with same waves but no detail requirement... simpler: one large plane 3000x3000 with 256 segments centered on boat plus outer flat skirt. I'll do camera-following inner grid + outer ring mesh with lower res, both sharing the same shader.
• Fragment shader: depth-based color (sample height texture via world->uv), fresnel sky reflection color, sun glint (specular), foam: whitecaps by wave crest factor + shore foam by depth threshold with animated noise. Need DataTexture (float) for heightmap sampling in fragment shader. Use THREE.DataTexture with FloatType, LinearFilter.

Sky:

• Big sphere with custom shader: gradient by sun elevation, sun disc + glow, moon disc, stars (hash-based) visible at night, procedural clouds (fbm in fragment on upper hemisphere, moving with time), horizon haze. Day-night cycle driven by timeOfDay uniform (controllable, default ~10:30am slowly advancing).

Terrain:

• PlaneGeometry HM_RES-1 x HM_RES-1 (decimated to ~256x256 for render; vertex positions displaced from heightmap on CPU), vertex colors by height/slope (sand near 0-2m, grass 2-25, rock by slope, snow > 45). Simple standard material with vertexColors; receive shadows maybe off for perf. Add a custom onBeforeCompile for cheap wet-sand darkening near waterline? Keep simpler: MeshStandardMaterial vertexColors with flatShading false. Also underwater terrain continues (bake extends below sea level).

Boat:

• Group: hull (stylized from lathe/extrude or shaped box + scaled sphere?), simpler: hull from ExtrudeGeometry or a manually shaped geometry via LatheGeometry scaled. I'll build hull from a parametric approach: use a CapsuleGeometry scaled (length 7, beam 2.2) cut... Actually simplest good-looking: hull = elongated, flattened sphere-ish via SphereGeometry scaled + a deck plane + cabin box + mast cylinder + boom + two sails (triangular meshes with slight curve via plane with custom verts), keel + rudder. White hull with stripe.
• Sails: custom BufferGeometry triangle with billow (curve the middle out) — main sail + jib. Sail trim rotates boom around mast.

Buoyancy:

• Sample Gerstner wave heights on CPU (replicate wave math in JS) at 3-4 points (bow, stern, port, starboard) to compute pitch/roll/heave. Heel from wind.

Sailing physics:

• State: heading θ, speed v. Controls: rudder input (turn rate ∝ v), sail trim 0..1 (how close-hauled). Wind: direction + speed (slowly varying). Boat accel = f(angle between wind and boat heading, sail trim) — polar curve-ish: no-go zone within ~35° of upwind, best at beam/broad reach. Speed target up to ~8-10 knots scaled. Autopilot: pick next island waypoint, steer toward it, auto-trim sails. Grounding: if depth < draft (1.5m), damp speed, show warning, push toward deeper.

Wake & spray particles:

• Pool ~600 points; spawn at stern when moving (foam trail fading), bow spray when speed > threshold & waves. Custom PointsMaterial shader: size attenuation, fade by life, soft round sprite via fragment discard.

Seagulls:

• ~14 gulls: body (cone/sphere) + two wings (planes) flapping via sin; flock circles islands at radius/height with noise offsets; a few follow boat. Cheap geometries merged per gull (two wing meshes animated by rotation.z).

Audio:

• WebAudio: noise buffer → lowpass with LFO for surf; separate filtered noise for wind with gain tied to wind speed & boat speed; gentle delay/reverb via feedback delay? Keep simple: two noise sources with filters + gain automation. Toggle with M; starts on first user gesture.

Cameras:

• Chase: behind boat with smoothed look-ahead, mouse-drag offsets yaw/pitch, wheel zoom. Orbit: free orbit around boat (spherical coords, drag). Cinematic: slow crane shots around boat/islands, cuts every ~12s. C key cycles.

Post:

• EffectComposer + RenderPass + UnrealBloomPass (strength ~0.35, threshold ~0.85) + optional OutputPass (r160 has OutputPass). Vignette via CSS overlay (cheaper).

HUD:

• Speed (kn), heading (°), wind arrow & speed, depth, camera mode, FPS, controls hint. A small compass-ish wind indicator (canvas or div with rotated arrow). Buttons row: Autopilot, Camera, Sound, Snapshot, GUI toggle.

GUI (lil-gui):

• Ocean: wave height, choppiness, foam amount. Sky: time of day, cloud coverage. Wind: speed, direction. Helm: sail trim, autopilot toggle. FX: bloom, quality (pixel ratio). Audio: master volume.

Quality/resize:

• Pixel ratio capped at 1.75, adjustable 0.5..2. Handle resize for camera/composer.

Loading overlay:

• Progress bar during heightmap bake; then fade.

Snapshot:

• render then toDataURL → download link click. Must render with preserveDrawingBuffer false → do composer.render() right before toDataURL in same tick.

I'll now write the file in ~10 chunks. Let me be careful about correctness since I can't run WebGL here. I can, however, syntax-check the JS with node (extract module script and run node --check after stripping imports... imports of 'three' will fail at runtime but node --check only parses; ES module parse works with node --input-type=module --check? node --check works for CommonJS; for ESM use node --check with .mjs extension file — yes, node --check file.mjs works and only parses (imports not executed... actually --check doesn't resolve imports, just parses). Good plan: assemble, extract content into /tmp/az.mjs, run node --check.

Careful details:

• Gerstner wave function must be IDENTICAL in GLSL and JS. I'll define wave params in JS array, generate GLSL code string from it, and implement JS sampler from same params.

Wave model (Gerstner): for each wave i: dir (dx,dz) normalized, wavelength L, amplitude A, speed s, steepness Q. k = 2π/L; c = sqrt(9.8/k) * speedFactor... Gerstner phase speed often sqrt(g/k). phase = k*(d·p - ct) ... Actually phase = kdot(d,p) - ω t with ω = sqrt(g k) * speedMul. Displacement: x += QAd.xcos(phase); z += QAd.zcos(phase); y += A*sin(phase). Normal via partial derivatives — standard Gerstner normal computation. I'll implement full normal in shader and in JS (needed for boat orientation).

Sum of 6 waves with decreasing wavelengths (60, 34, 21, 13, 8, 5 m), amplitude scaling with global "waveHeight".

Ocean shader vertex: compute displaced position + normal, pass world pos, crest factor (sum of cos for foam), view depth. Fragment:

• base deep color mix to shallow by depth = -terrainH(worldXZ) sampled from heightTexture (world→uv: (pos + half)/WORLD_SIZE).
• foam: shore foam where depth < 1.2 + animated; crest foam by crestFactor & noise.
• reflection: approximate sky color by reflecting view dir on normal → sample sky gradient function replicated in ocean shader (simple 3-stop gradient + sun glow). Fresnel mix.
• sun specular: Blinn-ish pow.
• Output color with tone mapping handled by renderer (ACES). ShaderMaterial ignores tone mapping unless we include tonemapping_fragment chunks — for ShaderMaterial we can include #include <tonemapping_fragment> and <colorspace_fragment> at end (r160 names). I'll write the shader with #include <tonemapping_fragment> #include <colorspace_fragment> chunks — works in ShaderMaterial in r160 as long as we use gl_FragColor. Yes, those chunks operate on gl_FragColor.

Sky: BackSide sphere radius ~4000, ShaderMaterial with time-of-day uniforms: sunDir. Compute: sky gradient via mix of zenith/horizon colors depending on sun elevation (day/sunset/night palettes), sun disc smoothstep + halo, moon (opposite dir) smaller disc, stars via hash on direction grid at night, clouds: fbm(dir.xz/dir.y scaled + wind*t) on band above horizon. dither to avoid banding.

Terrain: BufferGeometry grid 256x256 over WORLD_SIZE, heights from hmap sample. Colors computed per-vertex: base by height & slope. Normals computed via computeVertexNormals. Material MeshStandardMaterial({vertexColors:true, roughness:.95}). Slight onBeforeCompile to darken below waterline (wet sand) — optional; skip for safety, instead bake color darkening for h in [-1.5, 0.3] (wet band) at bake time — static, fine.

Lights: DirectionalLight sun (position from sunDir * 1000 relative to boat target), color/intensity by elevation; HemisphereLight ambient sky/ground; small ambient at night. Shadows: only if quality high — DirectionalLight castShadow with tight 120m ortho box following boat; terrain + boat receive/cast. Keep shadows ON but low res 1024, update each frame (sun follows boat). Might be perf-heavy; acceptable.

Fog: scene.fog = new THREE.Fog matching horizon color, near 600 far 2600. Update color by time of day.

Boat build (group "boat"):

• hull: use LatheGeometry profile? Lathe gives radially symmetric; scale x by 0.42 → decent hull. Points from stern to bow along... Lathe rotates around Y axis: profile r(y). Then scale.z? Hmm — lathe around Y gives vertical axis; I want horizontal hull. Alternative: hull = CapsuleGeometry(radius=1.1, length=5.2) rotated to lie along Z, scaled y 0.75 → rounded hull; taper bow manually? Simplest robust: SphereGeometry(1, 24, 16) scaled (1.15, 0.95, 3.6) then translate so top at deck. Looks like a stylized hull, fine with white material + stripe via a thin torus/box. Deck: circle scaled. Cabin: box with rounded? plain box white + windows dark band (thin box). Mast: cylinder h=9. Boom: cylinder along Y-rotated. Sails: mainsail = custom triangle (mast top → boom end → mast base) with belly curve; jib = triangle from mast top to bow to deck-mast base. Build sail geometry programmatically: parametric grid between two edges with billow = sin(u*π)sin(vπ)*0.35 along normal. Material DoubleSide white with slight sheen.
• keel: thin box below hull; rudder: box at stern.
• flag at mast top (small plane waving via vertex shader? skip - static rotated plane, animate rotation in JS).

Boat physics update(dt):

• wind: windDir (angle, from which wind blows), windSpeed, gust noise.
• sailTrim 0..1 (0 = fully eased, 1 = hauled tight). Optimal sail angle = clamp(angle to wind), we compute efficiency = polar(apparentWindAngle) * (1 - |sailAngleOptimal - sailAngle|/maxSailAngle-ish). Simplify: effectiveness = pow(sin(angleToWind), ...) with no-go if |angleToWind| < 0.6 rad → heavy luffing (speed decays, sails flap → visual flutter). trim quality = 1 - |trim - trimOptimal| where trimOptimal = clamp(|angleToWind|/π,0,1)... something like that.
• target speed = maxSpeed * eff * trim * windSpeed/maxWind... accelerate v toward target with time constant; drag ∝ v².
• heading += rudder * turnRate * (v/maxV) * dt; rudder -1..1 smoothed toward input.
• heel: roll offset = clamp(sideForce) — wind perpendicular component → heel angle up to ~18°, eased.
• buoyancy: sample wave height at bow/stern/port/starboard offsets → pitch/roll targets, heave offset; lerp boat.rotation with smoothing; yaw handled by heading.
• grounding: depth = -terrainHeight at boat pos; if depth < draft: v *= (1 - k dt), spawn bottom scraping? Just slow + HUD warn + push heading toward deeper gradient direction (sample gradient of terrain).

Wake particles:

• Points pool N=800; each particle: pos(vec3), vel, life, maxLife, size. Attributes updated on CPU each frame for active subset — with dynamic draw. Spawn: at stern waterline: rate ∝ speed; foam particles drift outward/back, life 1.5-4s. Bow spray when v > 5kn and waveImpact: spawn at bow with upward velocity. Shader: PointsMaterial-like ShaderMaterial with per-point alpha = smooth fade, color white-ish, size by attribute & perspective. AdditiveBlending? Normal blending with alpha, depthWrite false. Wake foam should be slightly blue-white.

Also a simple "wake trail" could just be these foam particles — fine.

Seagulls:

• Gull: group with body = capsule scaled, head+beak (small cone), two wings = PlaneGeometry(0.9,0.28) pivoted at body; wing.rotation.z = ±flap. Each gull: circling center (island peak or boat), radius 8-25, angular speed, phase, height 6-20 + bob. Orientation: face tangent direction, bank into turn. 12 gulls.

Audio:

• AudioEngine class: ctx lazy; master gain; surf = noise buffer looped → biquad lowpass 400-900Hz LFO 0.1Hz ±, gain 0.16 with slow swell LFO; wind = noise → bandpass 500Hz, gain = f(windSpeed, boatSpeed); optional gull cries: tiny synthesized chirp bursts every ~7-15s (osc freq envelope + gain envelope), only when gulls near. Snapshot of quality: keep modest.

Input:

• keys: ArrowLeft/Right or A/D rudder; ArrowUp/Down or W/S sail trim; C camera; P autopilot; M sound; G gui toggle; H help overlay toggle.
• mouse: drag rotate camera (mode-dependent), wheel zoom.
• touch: basic one-finger drag orbit, pinch zoom — implement minimal.

Camera modes:

• chase: pos = boat.pos + R(yawOff,pitchOff,dist) behind heading; lookAt boat + forward lead. yawOff/pitchOff from drag, decays to 0 slowly? Keep persistent offsets, auto-recenters yaw slowly.
• orbit: spherical around boat, full drag control.
• cinematic: pick from shot list: low near-water pan, high crane, island flyby; each shot = parametric curve (t) looped; cut every 10-14s; lookAt boat always.

GUI via lil-gui import. Buttons in HUD too for touch users.

HUD update at 4Hz + FPS meter.

Now — practical build plan: write chunks to /tmp/az/partNN.html then cat > /space/demos/009-azure-odyssey/index.html. Each write must be self-contained correct — I'll be careful.

The existing partial file will be overwritten entirely.

Let me now write the code. I'll write ~10 parts:

1. HTML head + CSS + HUD DOM + loader + importmap + script open + imports + config/state.
2. Utils (noise, math) + heightmap analytic + bake + height texture.
3. Sky shader module.
4. Ocean: gerstner params + GLSL gen + meshes + material.
5. Terrain build.
6. Boat build.
7. Particles (wake/spray) + gulls.
8. Audio engine.
9. Physics (sailing, buoyancy, grounding) + autopilot.
10. Cameras + input.
11. GUI + HUD + snapshot + quality/resize.
12. Init + loop + closing tags.

Watch out: r160 chunk names: colorspace_fragment (r154+). OutputPass exists in addons 'three/addons/postprocessing/OutputPass.js'. With OutputPass, tone mapping is applied in it; then my ShaderMaterials should NOT include tonemapping chunk? Actually with EffectComposer + OutputPass, the render targets are linear; OutputPass applies tone mapping + color space. ShaderMaterials writing gl_FragColor without tonemapping chunks output linear — correct for composer pipeline. But built-in materials (MeshStandardMaterial) also skip tone mapping when rendering to composer target? No — materials apply tone mapping in their shader if material.toneMapped && renderer.toneMapping set, regardless of render target... Hmm, in r160: tone mapping chunk applied only when rendering to screen? No — it's compiled into material based on renderer.toneMapping. Actually renderer checks _this.toneMapping when building program; rendering into render target still applies tone mapping? Let me recall: In WebGLPrograms.getParameters: toneMapping: material.toneMapped ? renderer.toneMapping : NoToneMapping. It doesn't depend on render target. So with EffectComposer you'd get double tone mapping if you also use OutputPass... BUT EffectComposer's default behavior: The recommended r160 setup is renderer.toneMapping = ACESFilmicToneMapping and add OutputPass at end; RenderPass renders scene to HalfFloat RT — in this case renderer sets tone mapping to NoToneMapping when renderTarget is bound? Hmm, actually there IS handling: WebGLRenderer sets toneMapping based on currentRenderTarget? I remember: "Tone mapping is only applied when rendering to the default frame buffer (screen)" — YES, that's true: in WebGLRenderer, getParameters uses currentRenderTarget === null ? renderer.toneMapping : NoToneMapping. Let me verify from memory of three r160 source: In WebGLPrograms.getParameters(renderer, ...), there's const toneMapping = renderer.toneMapping;... hmm.

Actually I recall clearly now: WebGLRenderer.js, function getParameters has:

Wait no, there's: currentRenderTarget === null ? _this.toneMapping : (currentRenderTarget.isXRRenderTarget === true ? currentRenderTarget.texture.toneMapping : NoToneMapping) — this is in WebGLPrograms.js getParameters:

where earlier const toneMapping = renderer.currentRenderTarget === null ? renderer.toneMapping : NoToneMapping? I'm fairly confident modern three (r152+) has exactly this: tone mapping only when rendering to screen, unless RT texture has toneMapping set. Yes — WebGLPrograms.getParameters: "const currentRenderTarget = renderer.getRenderTarget(); ... toneMapping: material.toneMapped ? (currentRenderTarget === null ? renderer.toneMapping : NoToneMapping) : NoToneMapping" roughly. So with EffectComposer: scene renders linear into RT, OutputPass applies ACES + sRGB.

And UnrealBloomPass works in linear HDR. OutputPass in r160 exists. Use:

renderer.toneMapping = ACESFilmicToneMapping; renderer.outputColorSpace = SRGBColorSpace (default).

For my custom shaders (ocean/sky): don't include tonemapping/colorspace chunks; output linear HDR-ish values. Sun disc can exceed 1.0 → blooms nicely.

DataTexture: format RedFormat, type FloatType, magFilter Linear, minFilter Linear, needsUpdate. In GLSL: texture2D(heightTex, uv).r — float textures with linear filtering require OES_texture_float_linear in WebGL2 — widely supported. Fallback: use HalfFloatType? Even better compat: bake heights into a Uint8 texture normalized to [-80, +80] range: value = clamp((h + 80)/160 * 255). Precision 0.63m — enough for shore foam coloring. I'll use Uint8 (LuminanceFormat deprecated; use RedFormat with UnsignedByteType). In shader: h = tex.r * 160 - 80.

For boat CPU sampling I have the Float32Array directly.

Island layout: define array of islands: {x, z, r (radius), h (peak)}. Analytic height:

• start with seafloor base = -14 - 6fbm(x0.0015) (deep ocean variation)
• for each island: d = dist to center; bump = h * exp(-(d/r)^2) plus ridge noise: h * exp(...) * (0.75 + 0.5fbm(x0.004 + seed)) and a beach shelf: also add broader shallow: h2 = 6exp(-(d/(r2.2))^2).
• clamp bottom. Islands list (world 2400, so coords within ±1200):

1. Main island at (-260, -180), r=190, h=52
2. Tall peak at (420, 260), r=150, h=74
3. Long atoll-ish at (60, 620), r=130, h=26
4. Small isle at (-620, 420), r=95, h=34
5. Tiny rock at (680, -340), r=70, h=22
6. Reef islet at (-180, 780)?? keep within 1200: (-180, 820) fine (dist from center ~840 < 1200). r=60 h=12
7. at (-760, -520), r=110, h=40
8. tiny at (880, 620)? dist ~1070 ok r=55 h=16

fbm: implement value noise with hash(ix,iz) deterministic (no texture needed on CPU; terrain colors CPU-side; sky clouds need GPU fbm separately with its own GLSL hash — independent, fine).

HM_RES = 512 → 512² = 262k samples, each evaluating 8 gaussians + fbm — fast enough (~a few ms * chunks). Bake async with progress bar.

Terrain render resolution: 256x256 grid over world → cell ~9.4m. Fine with smooth shading.

Ocean near grid: PlaneGeometry(520, 520, 220, 220) rotated to XZ, follows boat snapped to 2m grid... snapped to min wavelength multiple to prevent vertex swimming: snap = 520/220 ≈ 2.36m grid; snap position to 4.72m. OK: snap to 8m? Waves min wavelength 5m → snap should be multiple of... swimming happens when offset isn't multiple of wavelength for each wave; use snap = lcm-ish? Common trick: snap to largest wavelength (60m)? Then grid visibly jumps. Better: snap to 2m — swimming still occurs but subtle since we recompute world pos from camera each frame... Actually swimming occurs because displacement depends on world xz; snapping to ANY fixed step keeps vertices at consistent world positions modulo step; if step doesn't divide wavelength, phase changes when grid jumps by step — but jump is exactly step so vertices land on new world coords; the surface at those coords is computed exactly → surface itself never "swims"; only the sampling lattice shifts. The artifact is aliasing shimmer, mitigated by small step. Use step 4m. Plus vertex density near camera higher? Keep uniform 220 segs.

Far ocean: big disc/plane 6000x6000, 48x48 segs, same shader (waves at that scale fine), positioned centered on boat (no snap needed). To avoid z-fighting overlap with near grid at 520 region: give far mesh a hole? Simpler: far mesh y-offset -0.35m below, near grid on top; at distance beyond 260 the near grid ends; the 0.35m step may show at edge... Alternative: single geometry ring: build custom BufferGeometry "radial" grid: dense inner, sparse outer rings (like CDLOD). That's elegant: rings with exponentially growing radii, plus inner square grid. Effort moderate: generate polar grid: center square grid 220² is 48k verts — heavy-ish but fine.

Simpler proven approach: near grid 520m/200seg + far plane with circular hole matching 500m. Build far plane as ring geometry: RingGeometry(240, 3200, 64, 8) in XZ — waves displace it; inner edge at 240 radius vs near grid half-diagonal 367 — overlap region hidden because ring starts INSIDE near grid extent (near grid covers ±260 → corners 367). Ring inner radius 240 < 260 ensures overlap hidden under near grid if ring slightly lower (offset -0.15m) and foam/color same-ish. The boundary at near-grid edge (square) vs ring... near grid edge is square, ring is circular: at corners, ring extends past grid; at edge midpoints (260), ring inner 240 means ring is UNDER grid from 240..260 (hidden, offset down), beyond 260 only ring → good, no visible seam except potential 0.15m cliff at grid square edge... The grid and ring both displaced by same waves → same surface height; the 0.15 offset applies everywhere → at the square boundary, sudden 15cm drop over horizontal gap ~0. Visible faintly maybe; reduce offset to 0.06 and enable slight fog — acceptable. Also make far ring segments enough near inner radius: RingGeometry(thetaSegments=128, phiSegments=10) — inner ring circumference 1500m/128 ≈ 12m per segment — for 5m waves aliasing at distance... but it's under near grid until 260. At r=260-300 circumference ~1700-1900/128 ≈ 14m — too coarse for 5-8m waves → visible lumpiness near boat. Hmm.

Alternative: three nested square grids (like classic "projected grid" lite): 520m/200, 1600m/96, 6000m/48, each lower res, each with hole for inner (or just layered with offsets). Square ring geometry: create ring by 4 trapezoid planes or custom BufferGeometry. I can write a helper squareRing(size, hole, segs) building a grid with vertices skipping inner region... simplest: build PlaneGeometry(size,size,segs,segs) and delete faces whose both verts inside hole → custom index filtering. Doable: build position array, keep all verts, filter triangles by midpoint radius > hole. Fine — CPU one-time cost.

I'll do: inner 560/224, mid 1800/110 hole 270, outer 6400/64 hole 880. All share shader. Offsets: -0, -0.08, -0.16. Fog hides outer aliasing. Vertex counts: 50k + ~12k + ~4k = fine.

Hmm wait — holes: mid hole half-size 270 vs inner grid half 280 → overlap 10m band hidden under inner (offset 8cm). Inner grid edge at 280: corners at 396 — mid plane starts showing beyond 280 along axes but corners covered till 396; mid has circular hole 270 → under inner grid everywhere within square |x|,|z|<280? Point (270.5, 270.5): radius 383 > 270 → exists in mid; inner covers it (280 square) ✓. Point (281, 0): inner ends, mid radius 281 > 270 ✓. Point (279, 10): r=279>270 mid exists under inner ✓ no gap.

Actually simpler: make mid hole 240 (safe margin under inner which spans to 280; 240 circle fully inside square ✓ (radius of square edge midpoints = 280 > 240). Outer hole 880 vs mid half 900 ✓.

Follow: grids follow boat: inner snapped 4m, mid snapped 8m, outer snapped 64m. Shader uses world position (modelMatrix * position) for waves — translate mesh, waves in world space. ✓.

Boat spawn: near island 1 in deeper water: start (-260+260, -180+40)? depth check → pick (-60, -40) open water between islands 1&2. Compute depth at spawn in code and nudge until depth > 6.

Sun/time: timeOfDay hours 0-24, default 10.2, advances 0.02 h/min real time? Make GUI slider 0-24 + "animate" toggle. sunDir = function: elevation = sin((t-6)/12*π) → day when t in 6..18. azimuth rotates. Golden sunset ~18.

Moon: opposite azimuth, elevation = -sun elevation.

Now sails geometry: mainsail: triangle pts: mastTop (0, 8.6, 0), mastBase (0, 1.4, 0.2), boomEnd (0, 1.3, -3.2) (boom toward stern = -Z if bow +Z). Grid 10x10 bilinear interpolation across triangle (u along mast, v toward boom...). Belly offset along +X? Belly direction = perpendicular to sail plane (±X), magnitude draft * sin(πu) sin(πv) * chord. Sign flips with tack side (sails pushed to leeward: sign = -sign(heel?) — animate sailSide smoothly toward leeward side). Nice detail!

Jib: forestay from mastTop to bow (0,1.1,3.4); clew at (0,1.0,0.9)? triangle between stay and clew, belly similar.

Flag at top: small plane 0.5x0.3 animated rotation/scale in JS (skew flutter) — simple: rotate around mast with wind + sin flutter of its rotation.z. OK.

Gull cries audio: schedule chirp: osc sawtooth 1400→900Hz 0.18s, gain env 0→0.08→0, slight FM. Random 6-14s when audio on.

Autopilot: waypoints = island centers in sequence; steer: desired heading to waypoint (offset orbit radius: aim at point offset r1.3 tangentially for scenic pass) — simpler: aim at waypoint; when within r1.6, advance to next island. Auto-trim sail = optimal trim. Rudder PID-lite: rudder = clamp(k*angleDiff). In no-go zone upwind of target: tack: if |angleToWind(target)| < noGo, steer targetHeading ± 50° whichever closer, switch tack every 20s or when off course. Implement simple.

Grounding: if depth < 2.2 → warning; speed target *= clamp(depth/2.2); if depth < 1.2 (aground): v → 0 fast, rudder ineffective, auto "kedge off": after 1.5s, push boat slowly backward toward deeper (compute terrain gradient ascending direction = toward deep? gradient of terrain height; deeper = -grad). Show "AGROUND — backing off" then resume.

HUD elements: big speed (kn), compass strip? Simple readouts: SPD 6.2 kn | HDG 042° | WIND 12 kn NE | DEPTH 18 m | ⛵ AUTO | FPS 60. Plus wind arrow div rotated via CSS transform (arrow pointing relative to boat heading: windRel = windDir - heading). Boat icon center. Nice: a small circular dial with boat glyph ⛵ and arrow ➤ rotated.

Buttons bottom-right: 📸 Snapshot, 🎥 Camera, 🧭 Autopilot, 🔊 Sound, ⚙️ GUI.

Help overlay (H): list of controls, shown initially 8s.

OK also FPS auto-quality: if avg fps < 45 for 4s → reduce pixelRatio step (min 0.75), disable shadows at lower step; if > 58 for 10s raise back. Nice touch, moderate code.

Length concern: total file maybe ~90-110KB. Writing via multiple read_write_file calls to /tmp parts then cat. Each part ~8-14KB. Fine.

Let me also double check lil-gui esm CDN: https://cdn.jsdelivr.net/npm/lil-gui@0.19.2/dist/lil-gui.esm.min.js — exists (0.19.2 has esm.min.js? lil-gui dist includes lil-gui.esm.js and .min? I know unpkg lil-gui@0.19.2/dist/lil-gui.esm.js exists. Use non-min esm.js to be safe. Add to importmap "lil-gui": that URL.

Import addons used: EffectComposer, RenderPass, UnrealBloomPass, OutputPass. Pass, ShaderPass not needed... OutputPass imports fine.

Now, WRITE THE CODE. Part by part. I'll number parts /tmp/az/p01..p12 then cat p* > index.html.

Part 1: doctype, head, css, body DOM (loader, hud, dial, buttons, help, vignette), importmap, script module open, imports, config constants, global state object.

Colors/branding: "AZURE ODYSSEY" gradient teal→sky→sand.

Let me carefully write GLSL. Shared noise GLSL for ocean foam & sky clouds:

Ocean vertex shader (GLSL generated with wave loop unrolled from JS params): uniforms: uTime, uWaveAmp (global), uCamPos? not needed in vertex. attributes: position (plane local), mesh translated in world → worldXZ = (modelMatrix*vec4(position,1)).xz — but modelMatrix includes only translation (meshes at y=0, rotation baked into geometry). Use worldPos = position + uOffset where uOffset = mesh.position (uniform-free: just use modelMatrix — fine since no rotation). I'll compute world = (modelMatrix * vec4(position,1.0)).xyz.

Gerstner per wave i (uniform arrays): dir vec2, k float, omega float, amp (base), q (steepness). Scale amp by uWaveAmp uniform. Compute:

Gerstner normal: For displacement D(x,z): X = x + Σ Q_i A_i d_ix cos(φ_i), Y = Σ A_i sin(φ_i), Z = z + Σ Q_i A_i d_iz cos(φ_i), φ_i = k_i(d_i·(x,z)) - ω_i t (using UNDISPLACED x,z — standard practice). ∂X/∂x = 1 - Σ Q A d_x² k sin φ ... let me define S=sin, C=cos: ∂X/∂x = 1 - Σ q a d.x d.x k S; ∂X/∂z = -Σ q a d.x d.z k S ∂Y/∂x = Σ a d.x k C; ∂Y/∂z = Σ a d.z k C ∂Z/∂x = -Σ q a d.z d.x k S; ∂Z/∂z = 1 - Σ q a d.z d.z k S Normal = cross(Tz, Tx)? For y-up: N = normalize(vec3(-∂Y/∂x, 1, -∂Y/∂z)) is approximation ignoring horizontal pinch (fine for small q). With q up to ~0.6 and several waves, approximation acceptable visually. But I need EXACT same math on CPU for boat sampling (height + normal-ish for pitch/roll). CPU: sample wave height H(x,z) = Σ a sin(φ) using undisplaced (x,z) — standard approximation (ignores that displaced point moves horizontally; fine).

crest factor for foam: Σ max(0, sin(φ)) * a weighted... simpler: crest = Σ aC? Use foam ∝ (Σ akC) i.e. surface steepness. I'll compute foamSignal = Σ akmax(C,0.)q... pass varying vFoam = clamp(Σ ak(0.5+0.5*C)*qNorm - bias, 0,1)uFoamCrest. Tune: typical ak per wave: L=60,a=0.9 → ak=0.094; 6 waves Σ ~0.3. Use foam = smoothstep(0.16, 0.34, steep) with noise breakup.

Varyings: vWorld, vNormal, vFoam (steepness), vViewDist.

Fragment:

Colors: deepCol rgb(0.012,0.10,0.18) HDR-ish; mid (0.02,0.23,0.32); shallow (0.10,0.55,0.55); sandGlow near 0..1.5 mix toward (0.35,0.6,0.55). waterCol = mix(shallow, mid, smoothstep(0.,8.,depth)); mix to deep smoothstep(8, 28, depth). Sky reflection: R = reflect(viewDir, n); skyCol = skyGradient(R) — reuse simplified gradient fn with uniforms uSunDir, uHorizonCol, uZenithCol (computed on CPU per time-of-day, passed in — good, avoids duplicating sunset logic in GLSL!). fresnel = pow(1-max(dot(-viewDir, n),0), 5) 0.85+0.06?? Schlick: F0 0.02 → fres = 0.02 + 0.98pow(1-cosθ,5). Multiply sky reflect by fres. Sun glint: spec = pow(max(dot(R, sunDir),0), 240) * sunColor * 3 (HDR → bloom!). Plus broad sheen pow(...,24)0.25. Foam: shoreFoam: band depth<2.2: foamN = fbm(world.xz0.8 + time0.15) — threshold animated by "lap" sine: edge = 1.6 + 0.5sin(time*0.9 + worldnoise) — foam = smoothstep(edge, edge-1.2, depth) * noise mask + whitecaps: capF = smoothstep(0.5,0.8,vFoamNoiseMix)... combine: foam = clamp(shore + caps, 0,1); color = mix(col, vec3(0.9,0.95,0.97)1.1, foam0.85). Also subsurface glow when looking through wave toward sun: sss = pow(max(dot(viewDir, -sunDirHoriz?),0)…) — keep simple: add green tint where wave faces sun & high: skip, enough features.

Final col = mix(waterCol, skyRefl, fres) + spec; + foam. alpha = 1 (opaque) — but shallow water should show sand: mix waterCol toward terrain-ish sand color at very shallow → gives illusion of transparency. Good.

Uniforms CPU-updated per frame: uTime, uSunDir, uSunCol, uHorizonCol, uZenithCol, uWaveAmp... wave arrays static.

Sky shader: sphere r=3800 BackSide, depthWrite false, fog:false. frag: dir = normalize(vWorldDir); sun amt = dot(dir, sunDir).

• dayFactor = smoothstep(-0.08, 0.25, sunDir.y); duskFactor = exp(-|sunDir.y|*6) warm band near horizon toward sun.
• zenith = mix(nightZen (0.008,0.015,0.045), dayZen (0.10,0.32,0.68), dayF); horizon = mix(nightHor (0.03,0.05,0.10), dayHor (0.55,0.75,0.86), dayF); plus dusk: horiz += vec3(1.0,0.45,0.15)duskpow(max(dot(dirH, sunH),0),3)*1.2; also overall sky *= mix night...
• base = mix(horizon, zenith, pow(clamp(dir.y,0,1), 0.55)); below horizon: darker sea haze color mix to deep.
• sun disc: d = dot(dir,sunDir); disc = smoothstep(cos(0.53°..),...) use smoothstep(0.99988,0.99996,d)sunI + glow pow(max(d,0),350)... + wide glow pow(...,8)0.18duskish. Sun color warm white (1.3,1.15,0.95)*dayI... when setting, orange.
• moon: mdir = -sunDir? Moon not exactly opposite but fine: mdot = dot(dir, moonDir); disc smoothstep(0.99995,0.99999)*0.9 + glow; crater texture skip.
• stars: only when night: grid hash on dir: p = dir300; star = pow(hash, ...) twinkle sin(t3+h). Multiply smoothstep(0.1,-0.2,sunDir.y) and (1-cloud).
• clouds: project dir onto plane y=1: uv = dir.xz/(dir.y+0.15)0.8 + windt0.004; c = fbm(uv1.6) shaped: cov = smoothstep(1-uCloudCover, 1-uCloudCover+0.35, fbm) — clouds near horizon fade (dir.y<0.05 fade), cloudCol = mix(white*dayF lit by sun, grey night). Blend over sky. Sun silver lining: edge highlight where cloud gradient faces sun — skip, keep simple two-tone.
• dithering: + (hash-0.5)/255.

CPU computes per-frame: sunDir, sunColor, horizon/zenith colors (for ocean + fog + hemi light) from timeOfDay via JS palette function — single source of truth.

Terrain colors JS: for each vertex: h, slope via finite diff of hmap.

• base palette: sand (0.76,0.70,0.50) h<2.5; grass (0.23,0.42,0.18) 2.5-22 mix noise; rock (0.42,0.38,0.34) slope>0.55 or h 22-45; snow (0.92,0.93,0.95) h>48 smoothstep.
• underwater: h<0: sand → deep (0.10,0.14,0.16) by depth smoothstep(0,-25) tinted teal; wet band h in [-1,0.6]: darken 0.75.
• variation: multiply 0.92..1.08 noise.

Lights:

• sun DirectionalLight, castShadow true (shadow.mapSize 2048? use 1024), camera ortho ±60, near 1 far 400, target boat. Position = boat + sunDir*180. Intensity = 3.0 * dayF (physical-ish with ACES). Color = sunCol.
• hemi: sky color = zenith-ish, ground = sea deep, intensity 0.5.
• night ambient min: ensure dayF floor 0.06 + moonlight: dim blue directional opposite? just hemi floor.

Fog: THREE.Fog(color=horizonCol, 500, 5200). Terrain material fog default true; ocean shader manual fog: apply exp fog in fragment manually: fogF = 1-exp(-(dist/3500)^2)… mix(col, uFogCol, fogF). Sky no fog.

Composer sizes on resize; bloom.strength 0.35 radius 0.6 threshold 0.9.

Boat speed display knots: 1 m/s ≈ 1.94384 kn. maxSpeed ~ 7 m/s (≈13.6kn) fast-ish for fun; scale: hull 7m.

Physics dt clamp 0.05. Use fixed-ish accumulate? Variable fine with clamp.

Wake: spawn at stern pos world: behind boat at water level, rate = speed4/s, vel = boat back dir0.5 + spread random, life 2-5s growing size 0.4→2.2 fading. Also side streaks from bow wave when heeled? keep stern foam + bow spray + hull side trickle at speed. Points shader:

Blending: NormalBlending, transparent, depthWrite false. Color near-white (0.85,0.92,0.95).

Gull geometry: body: SphereGeometry(0.16,8,6) scaled (1,0.8,2.2); wings: PlaneGeometry(0.85,0.3,1,1) with slight sweep — pivot at inner edge: translate geometry x by 0.425 so rotation.z pivots at body. Left wing rotation.z = flap, right = -flap; flap = sin(tfreq + phase)0.55 + glideBias. White-grey material, beak orange cone. Flock update: each gull has anchor (island or boat), mode circle: θ += ω dt; pos = anchor + r(cosθ, 0, sinθ); y = h + sin(t0.7+φ)*1.5; heading tangent: dir = (-sinθ, 0, cosθ)sign(ω); bank roll = 0.4sign(ω). lookAt pos+dir. Boat-followers: anchor = boat pos + offset above stern, when boat moving; else circle.

Audio graph:

Start on first pointerdown/keydown (resume ctx). M toggles master.

GUI structure (lil-gui):

• Ocean: Wave height 0..2 (uWaveAmp), Foam 0..2, Water clarity? skip.
• Sky: Time of day 0..24, Animate time bool, Cloud cover 0..1.
• Wind: Speed 2..22 kn? internal m/s — display kn via custom? just m/s 1..11, Direction 0..359.
• Helm: Sail trim 0..1, Autopilot bool (listen), Rudder indicator read-only? skip.
• FX: Bloom 0..1, Quality pixelRatio 0.5..2, Shadows bool, Snap button, Reset view.
• Audio: Volume 0..1.

HUD dial: div circle 64px border, inside arrow span rotated: transform rotate(windRelDeg). Boat icon fixed pointing up = boat heading. Color arrow by point-of-sail (red if in irons).

Snapshot: button → composer.render(); renderer.domElement.toBlob→ URL → a.download='azure-odyssey.png'.click().

Auto-quality: frame dt EMA; every 2s evaluate: if ema>22ms & pr>0.75 → pr-=0.25 apply; if ema<12 & pr<min(dpr,1.75) → pr+=0.25. Shadows toggled with pr drop below 1? Keep shadows always unless user off.

Loader: overlay with progress bar; steps: bake heightmap (progress), build scene, first render → fade out. Because module scripts run after parse; DOM ready fine.

Failure guard: WebGL2 check → message if unavailable. renderer = new THREE.WebGLRenderer({antialias:true, powerPreference:'high-performance'}); WebGL2 default in r160.

Let me now also define palettes: dayZen = new Color(0.10,0.30,0.62)? Slightly tropical: (0.12,0.35,0.70); dayHor = (0.55,0.74,0.85); duskHor boost handled in sky shader; for ocean uniform horizon use dayHor mixed toward dusk warm when sun low: horiz = lerp(dayHor, (0.95,0.55,0.30), duskF) etc. night zen (0.004,0.008,0.02), night hor (0.012,0.02,0.045). Compute in JS:

OK. Wind: windDir = FROM angle (met convention). Wind vector TO = dir+π. Boat heading θ (0 = +Z north? define 0°=north(+Z? or -Z)... use compass: heading angle φ; forward = (sin φ, 0, cos φ) with φ=0 → +Z "north", φ=90° → +X "east". Display HDG = φ deg. Wind FROM dir ψ: wind blows toward ψ+180. angleToWind = wrap(ψ+π - φ)?? Let: windTo = ψ+π. alpha = wrapAngle(windTo - φ) = angle between boat forward and where wind goes; if |alpha| ≈ π → wind from ahead (in irons when boat points toward wind FROM: alpha ≈ π means windTo opposite of heading → wind coming from ahead). efficiency curve: eff = sin-based: eff(alpha) = 0 when |alpha| > π-0.55 (within 32° of dead upwind)... Let β = π - |alpha| = angle off the wind (0 = dead downwind? no...). Redefine cleanly: δ = angle between heading and wind FROM direction = wrap(ψ - φ). |δ| = 0 → sailing directly upwind (in irons). |δ| = π → dead downwind. eff(|δ|): 0 for |δ|<0.6 (34°); ramp to 1 at 1.1; peak 1.0 around 1.6-2.2 (beam reach); downwind 0.8. Implement:

trimOptimal = clamp(a/π, 0, 1) (0 tight upwind? hmm: upwind sails tight (trim=1?) define trim 1 = hauled in tight, 0 = fully eased out. Optimal tightness ∝ closeness to wind: trimOpt = 1 - a/π clamped 0.05..0.95? Upwind a small → trimOpt 1 ✓; downwind aπ → trimOpt ~0 ✓. trimQuality = 1 - clamp(abs(trim - trimOpt)/0.5, 0, 1); power = eff * (0.25 + 0.75trimQuality) * clamp(windSpeed/9, 0.25, 1.15); targetV = maxV * pow(power, 0.8); also minimum steerage. v += (targetV - v) * (1 - exp(-dt/τ)), τ=3.5 accel / 1.8 decel? use τ = targetV>v? 4 : 2.2. Luff visual when eff≈0 & windSpeed>3: sail flutter = sin(t14)0.06 on sail group rotation... store luffAmount for audio/visual (skip audio flutter; visual: mainsail mesh slight rotation.z jitter — do scale flutter of belly via morphing? cheap: rotate sail group y by flutter0.15).

Boom/sail visual angle: sailAngleVis = trim * maxBoom(75°) toward leeward side: side = -sign(δ) (sails on opposite side of wind). boomYaw = side * (0.08 + (1-trim)*1.25) rad, smooth-lerped. Wait trim 1 = tight → boom near centerline (0.08 rad); trim 0 → boom out 1.33 rad (76°) ✓.

Heel: heelTarget = clamp(side * power * 0.5, ±0.32) rad... heel = -side? Wind from starboard (δ<0?) → boat heels to port: heel roll sign: roll about Z axis... boat rotation order 'YXZ': yaw heading, pitch, roll. roll.z target = heelTarget; pitch from waves.

Rudder: input smoothed rud = lerp toward key state ±1; headingRate = rud * (0.5 + v*0.06) * clamp(v/2,0,1)?? Turn rate ∝ speed: yawRate = rud * 0.55 * clamp(v/5, 0.15, 1.15) rad/s. Also weather helm slight.

Position integrate: pos += forward * v * dt.

Buoyancy sampling (CPU Gerstner identical constants): H(x,z,t) = Σ a_i sin(k_i (dx x + dz z) - ω_i t) * uWaveAmp... plus q horizontal ignored for height sampling (approx fine). Sample at 4 points relative boat (±3.2 Z bow/stern, ±1.1 X): hB,hS,hP,hSt → pitch = atan2(hB-hS, 6.4)*0.8; waveRoll = atan2(hP-hSt, 2.2)0.8; heave = avg0.9. Apply: boat.position.y = heave (smooth 25%); rotation.x = pitchSmooth; rotation.z = waveRoll + heel. rotation.y = heading (note forward +Z when rotation.y=φ? Object3D default forward for lookAt is -Z but we move via our own forward = (sinφ,0,cosφ) and geometry built with bow +Z, so rotation.y = φ directly ✓).

Autopilot waypoint logic as planned.

Grounding: depth = -terrainH(pos). draft 1.4. if depth < draft+0.6 → speed cap; if depth < 0.9 → aground state: v*=exp(-3dt); push pos along -grad(terrain) * 0.5dt... compute grad via finite diff of hmap; deeperDir = normalize(grad) (terrain rises toward land → downhill = deeper water = -grad? terrain height increases toward island center; deeper = decreasing h = -∇h ✓).

Now the heightmap texture for ocean shader: R channel normalized: value = clamp((h - hMin)/(hMax-hMin)); hMin=-85, hMax=+85 → uHMin=-85, uHScale=170.

One more: islands auto-generated deterministic seed so same every load (nice for autopilot consistency). Use fixed island list (handcrafted above).

Waypoints: islands.map(center) — autopilot tours in order, nearest first.

Also add distant sail? no. Dolphins? skip — scope is already large. Keep the listed 17 features.

Let me count uniforms for ocean shader — wave arrays as const int NUM_W 6 with uniform vec4 uWaves[6] (dir.xy, k, ω packed) + vec2 uAQ[6] (amp, q)? Use two arrays vec4 uW1[6] (d.x, d.z, k, om), vec2 uW2 amp,q? GLSL1 array uniforms fine. Set via { value: [Vector4...] }.

JS wave sampler uses same array. Generate from spec table:

k=2π/len; ω=sqrt(9.81*k)spd; dir=(cos,sin) rotated — dirs in xz plane: dir=(cos θ, sin θ) mapping to (x,z). Sum ampweighted... total possible crest Σamp ≈ 2.15 * uWaveAmp(1) → wave height ~±2m — decent swell. Wave dir base rotates slowly with wind? Waves align with wind: rotate all dirDeg by windFrom offset? Keep fixed (swell independent of local wind), fine.

CPU waveHeight(x,z,t) loops 6 — cheap even for 5 samples/frame.

Normal for boat from 4 samples finite diff — no need analytic normal. Ocean vertex normal: analytic approx N=(-dYdx, 1, -dYdz) using undisplaced derivatives Σ a k d.x C — good enough, plus micro-normal detail in fragment? Add ripple detail normal perturb in fragment via fbm gradient — adds sparkle: perturb n.xz += (fbm derivatives)*0.12 scaled by distance fade. Implement cheap: sample vnoise at two offsets to estimate grad. 2 fbm calls — ok.

gl_PointSize cap: fine.

Right — also "quality" var PR = min(devicePixelRatio, 1.75).

Shadows: renderer.shadowMap.enabled = true; type PCFSoft. sun.castShadow; terrain.receiveShadow = true; boat parts castShadow (hull, mast, sails) & receive. Ocean doesn't receive (shader custom) — fine.

Also add simple buoy field? Skip.

Write order in file must respect JS execution: everything inside one module script, function declarations hoisted; call init() at end.

Size estimate ok. Let me write the parts now. I'll aim ~12 writes. Then assemble & node --check.

Additionally update /space/demos/index.html: insert 009 card at top of list after the comment marker.

Also the previous partial index.html for 009 — overwrite fully with cat.

Let me draft each part's exact content carefully. I'll write files to /tmp/az/.

Note: in template literals inside the HTML, avoid ${ sequences that might collide with shell heredocs — I'll use write_file tool (no shell interpolation) so safe. But GLSL inside JS template literals uses ${} intentionally for generated constants — careful to escape properly when I generate wave loop: I'll generate GLSL by JS string building with ${NUM_W} etc — fine within write_file.

One risk: write_file content with backticks & ${} — the tool writes literally. ✓

GLSL version: three r160 ShaderMaterial defaults GLSL1 syntax (attribute/varying) auto-converted? three injects #version 300 es only if material.glslVersion = THREE.GLSL3. Default: WebGL2 context compiles GLSL ES 3.0 but three prepends compat defines (attribute → in etc.) Yes three handles: for ShaderMaterial default, it prefixes with #version 300 es and defines attribute/varying/texture2D macros. ✓ So write classic syntax.

UnrealBloomPass import path: 'three/addons/postprocessing/UnrealBloomPass.js'. OutputPass: 'three/addons/postprocessing/OutputPass.js'. EffectComposer: 'three/addons/postprocessing/EffectComposer.js'. RenderPass likewise.

lil-gui: import GUI from 'lil-gui'.

Let me write Part 1 now.

Also — favicon emoji sailboat ⛵. Title "Azure Odyssey — Three.js Demo".

HUD top-left: h1 + subtitle + stats block. Top-center pill: speed/heading/wind/depth + wind dial. Bottom-right buttons. Help panel bottom-left (H toggles; auto-hide after 9s). Loader overlay. Vignette div. Aground warning banner (hidden).

CSS aesthetic: dark glass pills, teal/cyan accents.

Now specifics of part files:

p01: head/css/dom/importmap + script start + imports + CONFIG + state + palettes helpers (smoothstep, lerp, clamp, wrapAngle, value-noise CPU). p02: islands + analyticHeight + hmap bake + sampleHeight + buildHeightTexture. p03: sky palette CPU (computeSunAndColors) + sky mesh shader. p04: ocean (wave table, GLSL gen, materials, 3 grids, CPU sampler). p05: terrain mesh. p06: boat build (hull/deck/cabin/mast/boom/sails/keel/rudder/flag) + sail geometry fn. p07: particles wake/spray class + gulls class. p08: audio engine. p09: physics update (wind gusts, sailing model, buoyancy, grounding, autopilot). p10: cameras (3 modes) + input (keyboard/mouse/touch). p11: GUI + HUD update + snapshot + resize/quality + buttons wiring. p12: init() + loop + close script/body/html.

Begin writing. Careful with every function name consistency. I'll keep a mental symbol table:

Globals: renderer, scene, camera, composer, bloomPass, clock, params (GUI state), WORLD = { size: 2400, half: 1200, hmin: -85, hscale: 170 }, HM_RES 512, hmap Float32Array, heightTex. ISLANDS array. sun = {dir: Vector3, col: Color}, palette {zen, hor, fog...}. oceanMats[] (share one material actually — one ShaderMaterial for all three meshes; but per-mesh same uniforms fine — single material). oceanGroup. skyMat, skyMesh. terrainMesh. boat Group + parts {sailMain, sailJib, boom, mast, flag, rudderMesh}, boatState {pos Vector3, heading, speed, rudder, trim, heel, luff, aground...}. wind {dir (FROM rad), speed (m/s), targetDir, targetSpeed, gustTimer}. wake = new WakeSystem(scene). gulls = new GullFlock(scene, anchors). audio = new AudioEngine(). camCtl = {mode:0 chase, yaw, pitch, dist, ...}. input = {keys:{}, drag...}.

Params (GUI): waveHeight:1, foam:1, timeOfDay:10.2, animateTime:true, timeSpeed:1 (game-min per real-sec?), cloudCover:0.35, windSpeed:6 (m/s ≈ 11.7kn), windDir: 220 (deg FROM), trim:0.5, autopilot:false, bloom:0.35, quality: devicePR, shadows:true, volume:0.8, snapshot(), help().

Game time: params.timeOfDay advances: +dt * (1/180) hours? 3 min real = 1 game hour if rate 1/180 h/s → full day 72min. timeSpeed slider 0..10 (×). Rate base 1/240.

Wind gusts: every 8-20s pick new targetDir ±25°, targetSpeed ±30%; ease.

HUD ids: #spd, #hdg, #wnd, #dep, #fps, #mode, #windArrow, #banner(aground), #help, #loader bar i.

Now — writing. Also remember loader progress fn setBar(p).

For safety with three r160: renderer.outputColorSpace default SRGB; using composer+OutputPass handles conversion — set renderer.toneMapping = ACESFilmic; do NOT set outputColorSpace to Linear; OutputPass reads renderer settings. ✓

physicallyCorrectLights removed in r160 (useLegacyLights default false since r155) — light intensities: Directional 3, hemi 0.6 fine.

SphereGeometry thetaLength for sails? No, custom BufferGeometry.

Sail geometry function:

normal computed from triangle. Build indexed BufferGeometry, computeVertexNormals. Material MeshStandardMaterial DoubleSide color 0xf5f1e6, roughness 0.7, side DoubleSide, flatShading false. slight emissive? no. Also a thin batten stripes? skip.

Mainsail corners: a=(0, 8.4, 0.35), b=(0, 1.5, 0.45) (mast at z~0.4?), set mast z=0.3. c = boom end (0, 1.35, -2.9). Wait bow +Z: boom extends aft → -Z ✓. Sail normal ±X. belly 0.5 sign animated: sailMesh.scale.x = bellySign? Scaling flips normals — instead store two morph? Simpler: rotate whole sail+boom group around mast Y: boomGroup.rotation.y = boomYaw; belly direction flip: since belly baked +X, when sail swings to -X side the belly should flip — cheat: sailGroup.scale.x = side (±1) — flips winding → material DoubleSide + normals recompute? computeVertexNormals once; flipping scale.x=-1 mirrors geometry incl normals (mirrored normals wrong sign but DoubleSide lighting uses face normal abs? standard material two-sided lighting flips normal for backface automatically ✓). OK acceptable.

Jib: forestay from mast top (0,8.4,0.35) to bow tip (0,1.15,3.55); clew at (0,1.25,1.2). jib group rotation.y around forestay axis — approximating: rotate jib around mast Y too (pivot near stay) — visually ok for stylized: jibGroup.rotation.y = boomYaw*0.9.

Flag: plane 0.46x0.26 at mast top, red; flutter: flag.rotation.y = windDirVis + sin(t*9)0.35; scale.x = 1+0.15sin(t13).

Hull: SphereGeometry(1, 28, 18) scaled (1.05, 0.78, 3.4), position y=0.15, white material; stripe: BoxGeometry(2.12*? ...) simpler: TorusGeometry around? Use thin cylinder scaled like hull at y=0.55 radius slightly larger — a scaled sphere shell band? Skip stripe; add rub rail: TorusGeometry(1, 0.06) scaled (1.05,3.4) rotated to lie along hull sheer line y=0.75, color teak brown. Torus default in XY plane; rotate x 90° → XZ ring radius 1 → scale (1.06, 1, 3.42). ✓ Deck: CircleGeometry(1, 24) scaled (0.95, 3.2) rotX -90 at y=0.72 color light teak (0.72,0.55,0.35 rough). Actually ellipse deck over hull top: ok slight intersection fine. Cockpit: small dark box sunk at stern (0,0.78,-1.6) size (0.9,0.25,1.0) dark navy. Cabin: box (1.1,0.55,1.6) y=1.0 z=0.2 white + window band box (1.12,0.18,1.3) y=1.05 z=0.25 dark glass. Mast: CylinderGeometry(0.045,0.06,7.6) at (0, 4.6, 0.35). Boom: cyl(0.04,0.04,3.1) rotated X 90° at (0,1.42,-1.1+?) boom from mast to -Z: position (0,1.42,-1.2), length 3.0 centered z = 0.35-1.5=-1.15 ✓ inside boomGroup pivot at mast (0,1.42,0.35) → boom child at z=-1.5 local. Keel: box(0.12,1.1,1.8) at (0,-0.9,0.3) gray + bulb torpedo capsule (0.18 r, len 1.2) at (0,-1.45,0.3). Rudder: box(0.08,0.9,0.5) at (0,-0.5,-3.35) — rotate with rudder input visual rotation.y = rud*0.5. Bow pulpit: small torus arc? skip. castShadow: hull, cabin, mast, boom, sails.

boat group children fine.

Boat scale overall ~7m — matches world scale (islands hundreds of m). Camera dist chase ~ 18m.

Gulls anchor islands[0..3] + boat follower.

Audio chirp gull: only if camera near anchor island — just random, low volume.

OK also FPS meter: frames count each second.

Vignette CSS radial.

Help overlay content: ⛵ Azure Odyssey controls: ←/→ rudder · ↑/↓ sail trim · C camera · P autopilot · M sound · G settings · H help · drag orbit · wheel zoom · 📸 snapshot button.

Let me write files now. Part sizes will be big; the tool should handle. Let me go.

Also note: ES module + importmap requires the page served over http — fine.

One more consideration: previous partial file used HM_RES maybe 512 and functions bakeHeightmap etc. I'm overwriting everything, so no compat concerns.

Begin p01.

Actually also need setBar + loadMsg functions early (DOM refs).

For DOM: ids: app, loader, barFill(i), loadMsg, hud(#hud), pill stats spans spd/hdg/wnd/dep/fps, dial #windArrow, #camMode, buttons: btnSnap, btnCam, btnAuto, btnSound, btnGui, help panel #help, banner #banner.

Buttons styled circular glass.

Now writing part files. Also define clamp/lerp/smoothstep/wrap utils + RNG (mulberry32) + CPU value noise (hash2i, vnoise, fbm) for terrain.

p01 content — write it.

For the importmap:

Script imports:

Go. I'll write each part with the write tool. Keep code tight but commented.

Part 1 (head+css+dom): ~ let's write.

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I'm at 61% time progress already. I need to speed up significantly. The full 12-part build may not fit. Let me write the remaining parts more efficiently — larger chunks per write. I have parts 1-2 done. Let me combine: ocean+terrain (p03), boat (p04), particles+gulls+audio (p05), physics+cameras+input (p06), gui+hud+init+loop (p07). Then assemble, syntax check, deploy, update index. Be efficient.

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