Rebuild Azure Odyssey Demo

Let me check the current state of things. The task says "Wake up and do as you please." The last execution was about rebuilding the Azure Odyssey demo. The previous execution was interrupted, and temporary files were lost. The last run started rebuilding by writing components into /tmp/az/ — p01.html and p02.html were completed. But since it says temporary files were lost previously, I should check if /tmp/az/ still exists.

Let me install shell tools and check the state of the demos folder and the temp files.

***********************************************************************************/`.

**********************************************************************************************************************************************************************************************************it.

Interesting. The 009-azure-odyssey/index.html is only 342 lines / 15821 bytes — that seems small for the ambitious demo described (with ocean, boat, wake, gulls, audio, physics, cameras, input, GUI, HUD). Also, the main index page does NOT mention "azure" — so demo 009 isn't listed in the index page. Let me look at the current 009 demo content and the index page to understand the state.

Now I understand the situation clearly:

1. Demo 009-azure-odyssey exists but is only 342 lines / ~15.8KB — just the CSS/HTML skeleton and utilities, not a complete demo. The previous rebuild was interrupted.
2. The main index page does NOT list demo 009.
3. The /tmp/az/ temp files are gone.

My task: "Wake up and do as you please." Given the context, the clear continuation is to complete the Azure Odyssey demo rebuild — write a full, complete, self-contained index.html for /space/demos/009-azure-odyssey/ and update the main index page to list it.

Since I'm writing from scratch (temp files lost), I'll write a complete single-file demo. This is a big file — likely 1500+ lines. I need to be strategic: write it in parts to local disk (working directory, not /space which may be slow — actually /space is s3fs and slow; better to build in local home dir or /tmp, then copy over in one operation).

Plan:

1. Build the complete demo as parts in /tmp/az/ (local, fast).
2. Concatenate into a single index.html.
3. Validate the structure (basic syntax checks with node if available).
4. Copy to /space/demos/009-azure-odyssey/index.html.
5. Update /space/demos/index.html with the 009 card.
6. Verify.

Let me first look at the rest of the existing 009 file to see how far it got and what conventions were established (utility names etc.), so I can either reuse or rewrite consistently. Actually since the file is incomplete (ends at line 342), let me view the rest of it to understand what exists.

The existing file has the CSS and part 1 (utilities, waves, islands, heightmap bake). Rather than try to reconstruct the exact parts from the previous run (which are lost), I'll write the whole demo from scratch in a single coherent pass. I'll keep the same overall design (it's well-documented in the summary):

• Ocean sailing demo "Azure Odyssey" — sail a boat through a procedural archipelago.
• Gerstner waves ocean shader with depth-based coloring (shallow turquoise near islands), foam, normal detail.
• Procedural sky with day-night cycle (sun/moon/stars/clouds).
• Terrain islands from baked heightmap with vertex colors.
• Boat with physics (sailing, buoyancy on waves, wake particles).
• Seagulls, audio (synthesized ambient ocean + wind), cameras (chase/orbit), input (WASD/arrows), GUI (lil-gui), HUD, main loop.

Let me check the existing file's full contents quickly so I can reuse the good parts (CSS/HTML and part 1 JS) verbatim — that saves time and keeps consistency. The file is 342 lines. Let me dump it locally, inspect what constants exist (HM_RES, WORLD_SIZE, SEABED, WAVES etc.), then write the remaining parts to complete it.

Actually, the file on /space IS the incomplete concatenation of p01.html only (342 lines)? The summary said p01.html is 382 lines. Close but not exact. Let me copy it to /tmp and inspect.

*********************************************************************************************************************************************************************************************************nt.

Part 1 is solid and complete (ends with bakeHeightmap). Now I need to write parts 2-6 to complete the demo. The previous run's plan was:

• p02: environment, sky, textures, terrain
• p03: ocean, boat, wake
• p04: gulls, audio
• p05: physics, cameras, input, GUI, HUD, main loop

Let me write these parts now. I'll write each part as a separate file then concatenate. Key APIs established in p01 that I must use consistently:

• settings object with: swell, foam, timeOfDay, cycle, cycleSpeed, clouds, windSpeed, windDir, autopilot, camera ('Chase'|'Orbit'|'Cinematic'), bloom, vignette, quality ('Medium'|'High'), volume, muted
• clamp, lerp, TAU, wrapAngle, sstep, mulberry32, hash2, vnoise, fbm
• WAVES, wavesA (Vector4 dx,dz,amp,len), wavesB (Vector4 speed,steep,phase,0), NW
• simTime, updateWavePhases(), waveHeight(x,z)
• ISLANDS with {x,z,r,peak,seed}
• analyticHeight(x,z), hmap, sampleHeight(x,z), bakeHeightmap(onProgress)
• DOM ids: app, loader (with #bar i and #loadmsg), hud, stats, pill (clock, camname, helm), toast, hints, actions (btn-auto, btn-cam, btn-snap, btn-sound)
• imports: THREE, OrbitControls, EffectComposer, RenderPass, UnrealBloomPass, OutputPass, GUI

Note: toHalfBits was mentioned in the summary but let me check if it's in p01... The grep didn't show it. Let me search for it. The summary said p01 includes toHalfBits. Let me check lines 240-246 region. Actually grep showed function fbm at 237-239 then jumps to const WAVES at 246. There's a gap 240-245 — probably the closing of fbm plus vnoiseT/fbmT tileable versions or toHalfBits. Let me check.

Then I'll write p02 onward. I must decide the design now and write carefully — this is a large amount of code. Let me be systematic and write high-quality, complete code.

Let me check lines 240-245 first.

OK — p01 does not include toHalfBits or vnoiseT/fbmT (the summary was slightly aspirational). I'll include what I need in p02.

Now let me write part 2: environment/sky state, GLSL noise chunk, sky dome shader, detail texture (tileable normal-ish noise), foam sprite texture, depth DataTexture from hmap, terrain mesh with vertex colors.

Design decisions for consistency:

Environment (env): holds sun direction, moon direction, colors for sky/fog/water, updated by updateSky().

Day-night palette via keyframes SKY_KEYS at various hours: each key has: skyZenith, skyHorizon, sunColor, sunIntensity, fog color, water colors (deep/shallow), ambient intensity. Interpolate between keys by hour with wrap.

Sky dome: big sphere (radius ~6000, BackSide) with ShaderMaterial; fragment computes gradient zenith→horizon, sun disc + glow, moon disc, stars (hash-based, visible at night), clouds (fbm, 2D domain on direction projected). Uniforms: sunDir, moonDir, colors, cloud coverage, time.

Depth texture: from hmap — a THREE.DataTexture with HalfFloatType, HM_RES x HM_RES, single channel (RedFormat). Actually for sampling in the ocean shader, store water depth = max(0, -terrainHeight) or store raw terrain height. I'll store raw height; shader computes depth = -h. 640x640 half floats = 409600 * 2 bytes = 819KB, fine.

Need toHalfBits for building Uint16Array of half floats. Implement in p02.

Detail texture: tileable normal map for water micro-waves: generate RGB where RG = gradient of tileable fbm, B=1. Tileable noise: use periodic value noise by sampling on a torus (4D) or simpler: make lattice wrap via mod. I'll implement vnoiseT(x, y, period) that wraps lattice coordinates mod period. Then fbmT.

Foam sprite: canvas radial gradient texture for particles.

Terrain: PlaneGeometry sized WORLD_SIZE, resolution maybe 320x320 segments (102k verts is fine — actually 3203202 tris ≈ 200k tris, OK). Sample hmap for heights (bilinear sampleHeight). Vertex colors by height & slope: sand near waterline, grass, rock on steep, peaks lighter. Add slight noise variation. Compute normals.

Also a simple lighting setup: DirectionalLight (sun/moon), HemisphereLight (sky/ground ambient).

Let me now write p02. I need to be careful about the total size and my time budget. I'll write compact but complete code.

Hmm, I need to organize. Let me define parts:

p02: env state + palette + updateSky, GLSL_NOISE, skyMat + sky dome, textures (detail, foam sprite, depth), terrain build, lights.

p03: ocean shader + mesh, boat (procedural hull, mast, sail, rigging), wake trail + spray particles.

p04: gulls (flapping birds on thermal paths), WebAudio ambience (filtered noise for sea + wind, gain by speed; creaks), audio toggle.

p05: physics (sail model: apparent wind, sail trim, heel; buoyancy from waveHeight at hull points; grounding on islands via sampleHeight; collision response), autopilot, cameras (chase, orbit, cinematic), input (keyboard, pointer drag look, wheel zoom), GUI, HUD updates, toast, snapshot, loader sequence, main loop with composer + bloom + vignette (custom shader pass? vignette via a simple fullscreen quad or as part of bloom pass — I'll do a custom final ShaderPass with vignette... Actually OutputPass exists; adding a vignette requires a custom ShaderPass before OutputPass. I'll add a small custom pass.)

Let me be careful with the number of draw calls and performance. Ocean: one big plane with ~256x256 segments for vertex waves within some radius? The ocean is 3200 world units; to have Gerstner detail, need tessellation. Options: single 512x512 grid over 3200 → vertex every 6.25m — wavelength min 6.3m needs finer. Common trick: radial grid that follows the boat — a mesh centered on camera/boat with higher density near center. Simpler: two meshes — a large low-res far ocean (128x128 over 3200) and a high-res near patch (256x256 over 700 units) that follows the boat (snapped to grid to avoid swimming). That's more code but much better visuals. I'll do: near patch follows boat with vertex snapping; far ring static. To keep it simpler and robust, I can do a single mesh of 360x360 segments covering 1600 units that follows the boat (snap position to grid step), plus a giant flat far plane (3200+) with fragment-only waves (normal detail, no displacement or small). Actually Gerstner displacement on far plane with 32x32 verts is fine for silhouette swell.

Let me go with:

• oceanNear: PlaneGeometry(1400, 1400, 288, 288) ≈ 83k verts, follows boat, snapped to step = 1400/288 ≈ 4.86m. Hmm min wavelength 6.3m at 4.86m sampling — marginal but with the swell multiplier those small waves are amp 0.05, negligible visually if undersampled; detail normal texture covers micro waves. OK.
• oceanFar: PlaneGeometry(9000, 9000, 96, 96) static at origin, only the 2 largest waves for displacement (or all 6, cheap in vertex shader anyway — vertex count low so sampling fine; but at 94m vertex spacing, only len>=92 waves sampled well; smaller ones will alias slightly — acceptable, they're tiny). To avoid z-fighting between near and far at the seam: far plane y = -0.15 below, and near patch alpha fade at edges? Simpler: keep far plane slightly lower (-0.25) and it only shows beyond near patch. Seams hidden by waves.

Water shader: vertex displaces via Gerstner (uniform wavesA/wavesB arrays), computes world pos; fragment: depth via depth texture sample (world xz → uv), color gradient shallow/deep, fresnel to sky color, sun specular (Blinn), subsurface glow on wave crests facing sun, foam: shoreline foam by depth threshold + crest foam by jacobian-ish (use normal y or height) × detail texture; normal from detail texture (2 scrolling samples) perturbed; alpha ~0.92.

Uniforms: wavesA[6], wavesB[6], depthTex, detailTex, colors (deep, shallow, sky, sun dir/color), foam amount, time.

Note GLSL uniform arrays of vec4: uniform vec4 uWavesA[6]; set via value: wavesA (array of Vector4) — THREE supports that.

Boat: procedural sailboat ~ built from lathe/extrude? Simpler: hull via a shaped LatheGeometry half? Let me build hull from a parametric approach: use a THREE.Shape for deck outline and extrude with bevel, then scale bottom. Easiest good-looking: hull from CapsuleGeometry scaled? Might look toy-like.

Alternative: build hull from cross-section loft: define sections along length, create BufferGeometry manually. That's ~40 lines and looks great. Sections: stern flat, mid wide, bow point. I'll write a loft function: for each station i (0..N), t=i/N, half-width w(t), depth d(t), deck height. Vertices ring: port/deck/starboard/keel. Let me define a simple ring of 8 points per section: from deck port → chine port → keel → chine starboard → deck starboard, plus deck plane. Add transom cap at stern, bow closes to point. Then compute normals.

Simpler robust approach: hull = combination of primitives: main hull via extruded shape with bevel (ExtrudeGeometry with depth = boat length, bevel for rounding), rotated; deck; cabin box with rounded; mast cylinder; boom; sail: custom BufferGeometry triangle curved (sail as parametric surface with draft) — I'll make sail via PlaneGeometry 8x8, displaced by sail curve (bulge depends on wind/trim), and it's nice because we can animate the bulge.

Wake: trail of foam quads behind boat — a ribbon mesh with fading alpha (store ring buffer of past positions, update vertex buffer each frame, alpha by age). Plus bow spray: THREE.Points pool with foam sprite texture, spawn rate ∝ speed, velocity from bow, gravity, fade.

Gulls: N birds, each a small group: body (cone) + 2 wings (planes) flapping via rotation.z = sin(t*freq); they circle on paths around islands/boat with banking. Instance with simple Group per bird (N=7) — cheap.

Audio: WebAudio: brown noise → lowpass (sea), pink noise → bandpass with LFO (wind), occasional creak (oscillator pitch bend) — keep simple: sea + wind, gains tied to windSpeed setting and boat speed; master gain = volume, mute toggle. Autoplay policy: start on first user gesture; provide sound button.

Physics:

• Boat state: pos (Vector3), heading, speed (scalar along heading), rudder input, sail trim (0..1), heel angle.
• Sailing model: true wind vector from windDir/windSpeed; apparent wind = true wind − boat velocity; angle of attack between sail and apparent wind; drive force = k * windSpeed² * sin(aoa) * trim... Simplify arcade: efficiency = |sin(angle between boat heading and wind)| with no-go zone near upwind; target speed = windSpeed * 0.9 * efficiency * trim; speed lerps toward target; heel = clamp(speed factor × side wind) with sign.
• Buoyancy/attitude: sample waveHeight at bow/stern/port/starboard points → pitch/roll targets, damped. y = average wave height.
• Collision: sampleHeight at bow; if terrain height > -1.2 (too shallow), push back / stop, toast "Ran aground!"; gentle slide along gradient. Also clamp world bounds.
• Autopilot: steer toward waypoint (nearest unvisited island? or circle waypoints), set helm auto, sails auto-trim to wind; toggling. Waypoint = sequence around islands; display toast.

Cameras:

• Chase: behind boat at distance (zoom via wheel), smoothed look-ahead; drag = orbit offset around boat (yaw/pitch) that decays back? Keep drag offset persistent, wheel adjusts distance.
• Orbit: OrbitControls with target on boat (update target each frame), enabled only in orbit mode.
• Cinematic: slow auto-orbit drift around boat + occasional low angle; simple: theta slowly increases, radius oscillates.

Main loop: fixed-ish dt clamp, update simTime, waves phases, physics, boat transform, wake/spray, gulls, sky env, sun light position, uniforms, HUD (throttle stats every ~100ms), composer render.

Quality settings: High = pixelRatio min(devicePixelRatio,2), near ocean 288 segs; Medium = pixelRatio 1.25, 192 segs; changing quality rebuilds ocean geometry + bloom resolution.

Vignette: custom ShaderPass after bloom, before OutputPass: color *= 1 - vignette * smooth vignette; also slight chromatic? keep vignette only.

Loader: run bakeHeightmap with progress → build textures, terrain, ocean, boat, etc. → fade loader, toast "Welcome aboard".

Snapshot: render, canvas.toBlob → download link.

That's a lot but doable. Let me also make sure the code closes the script/body/html tags at the end (p01 currently ends mid-script after bakeHeightmap).

Also note p01 uses settings.quality 'Medium' on mobile; and matchMedia — fine.

One important detail: wavesA/wavesB are const arrays of Vector4 — for uniforms I pass these arrays directly.

simTime is let at module scope; updateWavePhases() sets wavesB[i].z.

waveHeight uses settings.swell.

GPU vertex shader must mirror: y += ampswellcos(k*(dxx+dzz) - phase) and horizontal pinch x -= steepampdx*sin(...) etc. For normal computation in vertex shader, compute analytic derivatives. I'll compute position displacement + normal in shader analytically:

For each wave i:

• k = 2π/len; θ = k*(dxx+dzz) - phase; s = sin θ; c = cos θ;
• y += ac (a = ampswell)
• x -= qadxs; z -= qadzs (q = steep) — note steep in Gerstner is Q = steepness/(kanumWaves) typically; I'll just use small factor: pinch = steep*0.35.
• dydx += -akdxs; dydz += -akdzs (ignoring pinch effect on slope — approx fine).
• normal = normalize(vec3(-dydx, 1, -dydz)).

Depth texture uv: (worldPos.xz + halfWorld)/WORLD_SIZE, but the ocean far plane is 9000 wide — outside baked region depth = deep. In shader, clamp with border: sample with clamp; outside region, analyticHeight isn't known — treat as deep (SEABED). Use texture with ClampToEdge and in shader: if uv outside [0,1] → depth = deep. Fine.

Terrain: visible mesh from hmap over WORLD_SIZE at 384x384 segments (~295k tris — hmm heavy but ok on desktop; on medium quality 256x256). Actually terrain is mostly under water; visible only islands. It's fine.

Terrain vertex colors:

• h < -2: sandy underwater tinted (barely visible through water)
• -2..1.2: sand #d9c184
• 1.2..10: grass green varying with noise

• 10 or steep slope: rock grey/brown

• high peaks: light Add noise variation via fbm.

Lights: DirectionalLight sunLight updated per frame (position = boat + sunDir*800, target boat) with shadows? Shadows over 1400-area — shadow camera 200 units around boat, 2048 map on high. Terrain + boat receive/cast. Ocean doesn't receive shadows (skip for perf; acceptable).

Hemisphere light with sky/ground colors updated by env.

Fog: scene.fog = Fog(color, 800, 4200) updated with env; sky dome unaffected (fog: false in material).

Bloom: threshold 0.85, strength settings.bloom, radius 0.4.

Tone mapping: ACESFilmic, exposure ~1.0. OutputPass handles color space.

HUD stats: speed knots, wind kts, heading, FPS, depth under keel.

Clock: settings.timeOfDay formatted HH:MM.

Toast helper.

Buttons: btn-auto toggle autopilot; btn-cam cycle; btn-snap; btn-sound mute.

Keyboard: W/S trim (also ArrowUp/Down), A/D rudder (ArrowLeft/Right), Space ease sheets (trim→0 fast while held), C camera, V autopilot, M mute, H hide UI? add P snapshot. Also touch: drag look, wheel zoom — OrbitControls in orbit mode; for chase mode, implement custom pointer drag on canvas.

I need to be mindful: OrbitControls import is used only in Orbit mode; still fine.

Gulls: create 6; each follows a circular path around a center (some island or the boat), radius r, angular speed, height with bobbing; wings flap.

Audio: create on first gesture: AudioContext; master gain; sea = brown noise loop through lowpass(400) gain by windSpeed; wind = white noise through bandpass(600, Q .5) with LFO on gain, scaled by windSpeed + speed; creak every ~7s: triangle osc 90→60Hz quick, gain envelope tiny, only when moving. Mute toggles master gain. Volume setting.

Now, write the parts. I'll write p02 now.

Careful GLSL: uniform vec4 uWavesA[6]; — loop for (int i=0;i<6;i++).

Sky shader: direction from vWorldPosition - cameraPosition... For a dome centered on camera, better: make dome follow camera (position copy), use local position as direction: vDir = normalize(position). Compute in fragment.

Sky fragment:

• d = normalize(vDir); h = d.y
• base = mix(horizon, zenith, pow(max(h,0), 0.55)); below horizon: mix toward horizon/fog color.
• sun: sunAmt = dot(d, sunDir); disc = smoothstep(0.9993,0.9997, sunAmt); glow = pow(max(sunAmt,0), 64)0.5 + pow(max(sunAmt,0),8)0.25; color += sunColor(disc8 + glow) — bloom picks up.
• moon: moonAmt = dot(d, moonDir); disc similar smaller; glow small; times night factor.
• stars: night = 1-day; grid hash on direction: project d onto octahedral or use 3D hash: cell = floor(d*140); r = hash3; star = step(0.998, r) twinkle by time; multiply by (h>0) and night and (1-cloud).
• clouds: project d onto plane at height: uv = d.xz/(d.y+0.08)scale + wind drifttime; fbm 4 octaves (GLSL noise); cov = smoothstep(1-coverage, 1-coverage+0.25, f); cloudCol = mix(cloudDark, cloudLight, ...) lit by sun color; blend color = mix(color, cloudCol, cov*smoothstep(0.02,0.15,h)).
• final: gl_FragColor.

Include tonemapping false, fog false, side BackSide, depthWrite false, renderOrder -1, frustumCulled false, radius 7000 within far plane (camera far 12000).

GLSL noise: classic hash without sin precision issues? sin hash fine.

Terrain shader: MeshStandardMaterial with vertexColors: true. Standard material reacts to dir light + hemi. flatShading false.

Ocean transparency: transparent true, depthWrite false? With islands under water visible... depth texture gives color; we don't actually see terrain through water (it's opaque-ish). Set transparent: false, and blend alpha manually? Simpler: opaque water (no transparency), color encodes shallowness. Foam white. That avoids sorting issues entirely. Do opaque.

Boat hull loft: I'll write helper buildHull() returning BufferGeometry from sections. Sections t in [0,1] bow→stern? Let me param: length L=11, sections at t=0 stern, t=1 bow. halfBeam(t) = maxBeam * shape: sin curve with fine bow: w = (1-t)^0.35 * sin(min(t1.25,1)π/2)... let me use: beam profile w(t) = B * Math.sin(Math.acos(2t-1))? Simplest: w(t) = B * sqrt(1 - (2t-1)^2) elliptical, bow taper extra: multiply by (1 - 0.25t)... Deck sheer rises at bow: deckY(t) = 1.05 + 0.35*t^2. Depth(t) = 0.9 * sqrt(w/B) scaled. Keel points.

Ring per section (from port deck going down and around): p0: (-w, deckY, z) p1: (-w0.92, deckY - freeboard0.55, z) p2: (-w*0.55, deckY - freeboard, z) p3: (0, deckY - depthTotal, z) (keel) p4..p6 mirrored, p7: (w, deckY, z) Then deck plane separate: strip between (-w, deckY) and (w, deckY). Actually include deck closing in the same ring: ring = [portDeck, portTop, portMid, portLow, keel, stbLow, stbMid, stbTop, stbDeck] and then connect stbDeck→portDeck across the deck — that makes the ring closed (10 edges). Normals via computeVertexNormals. Ends: stern transom fan to center point; bow: sections converge w→0.001, ring degenerates — just clamp and let it close nearly-pointed, plus bow cap fan.

Loft code straightforward with index buffer. I'll write it carefully.

Sail: mast height 13, mainsail: triangle-ish plane (width foot 4.2 at bottom tapering to 0.3 at top, height 12) as PlaneGeometry(1,1,10,12) remapped: vertices scaled: x = foot * (1 - v0.94); y = vheight; bulge z = draft * sin(πu') ... draft sign flips with tack (heel side). I'll animate in JS per frame cheaply (11*13 verts) or via uniform in a custom shader — simpler: CPU update every frame is fine (143 verts), or every few frames. Do CPU every frame; negligible.

Actually simpler & still pretty: keep sail geometry static with fixed bulge, rotate boom angle by side; bulge sign flip via scale.z = ±1. Sail cloth texture: canvas with seams lines. Use MeshStandardMaterial double side, white slightly translucent? Keep simple: white with subtle seam lines from canvas texture.

Wake ribbon: ring buffer 120 points; each frame add stern pos if moved >1.5m; geometry: 2 verts per point (left/right of width growing with age), alpha fades. Update positions BufferAttribute; material additive, foam-ish color, transparent. Fine.

Spray: Points 300; pool with velocity, life; spawn at bow when speed>4: pos = bow ± random, vel = up/out + boat vel; gravity; size attenuation; opacity fade. Update CPU.

Flag at mast top: small plane waving via vertex sin in CPU (6x4 grid) — cheap, nice touch. Maybe skip to save budget... include simple flag.

HUD stats update every 150ms.

Alright — also env needs: sunDir, moonDir, sunColor, skyZenith, skyHorizon, fogColor, waterDeep, waterShallow, waterSun (specular color), hemiSky, hemiGround, sunIntensity, nightFactor.

SKY_KEYS: hours [0, 4.5, 6, 7.5, 12, 17, 18.5, 20, 22] with palettes. Interpolate linearly with wrap on 24. Colors as THREE.Color lerp.

updateSky(hour): find bracketing keys, lerp all colors; compute sun elevation: elev = sin((hour-6)/12π) → sunDir from azimuth fixed-ish (say azimuth 240°→ rotate through day: az = lerp(-90,90)? Standard: sun rises east sets west: azimuth = (hour-12)/12180° + 90. I'll do: ang = (hour - 6) / 12 * π (0 at 6h sunrise horizon, π at 18h); elev = sin(ang)*62°; azim rotates east→west. sunDir = (cos(az)*cosEl, sinEl, sin(az)*cosEl) with az = (hour/24)*TAU + offset. Simpler param fine — visuals matter more than astronomy. Moon = opposite (sunDir * -1, elev mirrored): moonDir = (-sunDir.x, -sunDir.y +? ) — use moonAng = ang + π.

nightFactor = smoothstep(-0.05, -0.2, sunElev) inverted: day = sstep(-0.08, 0.12, sinElev); night = 1-day.

Sun light intensity = day * 2.2 * warm factor; color from palette. When night, moonlight: dim blue directional — reuse same directional light: color → moonlight blue, intensity 0.25, direction = moonDir.

OK. Fog: FogExp2? Linear Fog(near 900 far 4500) with fogColor; sky material fog:false. Terrain standard material fog default true. Ocean ShaderMaterial: must handle fog manually — include fog chunk in my shader: I'll add fog manually: uniform fogColor/near/far; mix by distance. Or set material.fog = true and include #include <fog_pars_fragment> chunks — with ShaderMaterial I can include chunks. I'll write manual fog to keep control.

Also ocean must render sun glint with high dynamic range for bloom sparkles: specular pow 700 * sunColor * 3.

Water fragment detail:

• n = detail normal from 2 scrolling samples of detailTex (world uv scales 0.05 and 0.13, opposite scroll dirs), blend with vertex normal.
• view dir v; fresnel = pow(1 - max(dot(n,v),0), 5) * 0.9 + 0.08.
• depth: d = max(0, -terrainH + waveY?) just use -terrainH. shallowT = exp(-depth*0.18).
• waterCol = mix(deep, shallow, shallowT);
• subsurface: backlit crest: ss = pow(max(dot(v, -sunDir)… eh: sss = pow(clamp(dot(normalize(v + vec3(0,0.3,0)), -sunDir)...)) skip complexity: add crest glow = waveHeightN (vertex y normalized) * max(dot(-v, sunDir),0)^2 * shallowColor.
• reflect: skyCol = mix(horizon, zenith, reflect dir y) — approximate reflection color from env; col = mix(waterCol, skyCol, fresnel).
• spec: r = reflect(-v, n); spec = pow(max(dot(r, sunDir),0), 600)3 + pow(...,60)0.35; col += sunColorspecdayIntensity.
• foam: shoreline: foamBand = sstep by depth in [0.2, 2.2] with wave phase wobble using detail tex; crest foam: crest = clamp(vWorldY / (1.2swell),0,1) noise modulated; foamTex sample; col = mix(col, foamWhite, foamsettings.foam).
• fog mix.

Vertex shader also computes vWorldY and normal, passes world pos.

Detail texture: 256x256 RGBA, RG = normals from tileable fbm gradient, B unused, A = foam/noise pattern (tileable fbm) reused for foam. Generate via canvas ImageData.

Tileable noise: vnoiseT(x,y,per): lattice coords mod per. fbmT with per doubling per octave.

Foam sprite: 64x64 radial gradient canvas → THREE.CanvasTexture.

Depth texture: Uint16Array HM_RES*HM_RES half floats of terrain height. Sample in shader: texture2D(uDepth, uv).r. HalfFloatType filtering linear supported on WebGL2 (OES_texture_half_float_linear is core-ish in WebGL2? Linear filtering of half float requires extension but widely supported; to be safe use FloatType (4 bytes * 409600 = 1.6MB) with LinearFilter — float linear filtering needs OES_texture_float_linear, also common. Safest: use HalfFloatType — in WebGL2, half-float linear filtering IS core (16F is filterable). Yes: R16F is color-renderable & filterable in WebGL2. Use RedFormat + HalfFloatType + LinearFilter.

But THREE r160 DataTexture with RedFormat + HalfFloatType → internal format R16F. Good. Need toHalfBits conversion — standard snippet.

Terrain heights beyond hmap edge: far plane uv outside → clamp to edge gives SEABED-ish (edge of map is deep ocean mostly since islands are interior). Good.

Boat draft check: depth under keel = waveY - terrainH; grounded if terrainH > -1.6.

Let me now also handle "ran aground": push boat away along negative gradient: compute gradient of sampleHeight via finite diff; pos -= gradNorm * penetration * k; speed *= 0.4; toast throttled.

World bounds: |x|,|z| > 1500 → steer back toast "Open ocean ahead — turning back" or just clamp softly with push force.

Autopilot: pick current waypoint from a ring of points around the map (e.g., 6 waypoints between islands); steer heading toward waypoint with rudder auto; auto trim: trim target from wind angle: efficiency calc; within 60m → next waypoint.

Cinematic camera: theta += dt0.08; radius 26+sin(t0.13)10; height 6+sin(t0.21)*4; look at boat+bow offset. Plus cuts every 24s to a different preset angle — keep continuous (no cuts) for simplicity.

Chase cam: default dist 26, height 9; drag adds yawOffset/pitch; camera pos = boatPos + R(heading+yaw)(0,-dist...); behind = -forward. Smooth via damp. lookAt boat + forward8 + up*2.

Orbit cam: controls.enabled = (mode==='Orbit'), target damped to boat pos; camera not otherwise controlled.

Zoom wheel in Chase: dist 12..60.

Now GUI (lil-gui):

• Ocean: swell 0..1.6, foam 0..2
• Sky: timeOfDay 0..24 (listen), cycle bool, cycleSpeed 0..2, clouds 0..1
• Wind: windSpeed 2..16, windDir 0..360
• Boat: autopilot toggle, camera dropdown [Chase, Orbit, Cinematic]
• FX: bloom 0..1, vignette 0..1, quality [High, Medium] (rebuild), volume 0..1, muted
• Buttons: snapshot, reset?

Also gui.close() on desktop? keep open small — default open but collapsed? leave open.

Toast helper: showToast(msg, ms=2200).

HUD stats: Speed X.X kn · Wind X kn @XXX° · Heading XXX° · Depth XX m · FPS.

Pill: clock (HH:MM), camname, helm (Auto/Manual + colored).

OK, and the main sequence:

Quality switch: rebuildOcean() disposes and recreates near/far geometry with seg counts by quality; pixel ratio set; bloom pass resolution auto.

Resize handler.

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

Sound toggle: ensure AudioContext created on click; btn state.

Alright, time to write. I'll aim for p02 ≈ 330 lines, p03 ≈ 420, p04 ≈ 260, p05 ≈ 450. Let me write p02 now.

One more consideration: wavesA/wavesB are arrays of Vector4 — uniform value OK. On rebuild of ocean materials, reuse same uniform objects.

For the far ocean I'll use the same ShaderMaterial but a define FAROCEAN? Different geometry only — same material is fine (both displaced by same waves). But far plane 9000 with 96 segs → 93m spacing, waves len<92 alias — fine visually (they're small). Use one material, two meshes. Only near follows boat; far stays. Hmm, near patch is 1400 wide centered on boat; far covers everything. Overlap region: both drawn — z-fight? Far is displaced identically, so surfaces coincide in overlap → z-fighting. Solution: push far down 0.35m; near patch on top. At patch edge, 0.35m step visible? With waves ±1.5m, a 0.35 offset may show as slight discontinuity line at 700m from boat — far away, fog kicks in ~900. Acceptable. Alternatively make far material alpha-fade within 700m — complex. Keep -0.35m offset.

Also ocean near patch following boat: snap to wave grid step (1400/288≈4.86) to prevent vertex swimming: pos.x = round(boat.x/step)*step. UV for depth uses world pos in vertex shader, so snapping moves the mesh but world xz sampling stays correct. Geometry positions are local; shader adds uOffset (uniform vec2) to get world.

Both materials share uniforms incl. uOffset? Each mesh needs own uOffset → two materials but same fragment/vertex strings; create via factory makeOceanMaterial(). Far: uOffset (0,0) static + uYOff -0.35.

Wake color: foam white-ish; additive blending, depthWrite false.

Spray Points material: map foamSprite, transparent, depthWrite false, size 2.5 attenuated... custom size via PointsMaterial size: 3, sizeAttenuation true, vertexColors false, opacity per-point needs shader; simpler: use PointsMaterial with fixed opacity 0.7 and recycle; fade by shrinking y? PointsMaterial can't per-point alpha without custom shader. Use a tiny ShaderMaterial for points with attributes life → alpha & size. Fine, small shader.

Gull: cheap Group: body = small elongated sphere, wings = two thin boxes pivoted at body, rotate ±. 6 gulls.

Flag: plane 1.2x0.7 at masthead, CPU wave.

Cabin, tiller, rails: boxes/cylinders. Keep poly low. Boat group ~15 meshes + sail. Cast shadows for hull/mast/sail.

Shadow: renderer.shadowMap enabled, PCFSoft; sunLight.castShadow, camera box 60, mapSize 2048 high / 1024 med. Terrain receiveShadow; ocean receiveShadow false (ShaderMaterial would need shadow chunks — skip).

Boat scale: length 11m. Positions: start at (60, -60) island exists — spawn at (-260, 240)? Let me choose open water: spawn (-300, 260) heading 40°. I'll verify depth at spawn: islands at [60,-60] r150-330… spawn (-300,260): distance to [60,-60] is sqrt(360²+320²)=481 — safe; [-520,560]: dist sqrt(220²+300²)=372 — island r up to 330, shelf 2.1r up to 690?? shelfR = r*2.1 could reach... r max 330 → shelf 693. Hmm spawn might be shallow. I'll pick spawn by searching: find point near (-300,260) with depth > 8m — do a quick scan in code after bake: spiral search for depth>10 at ~250-400m from origin. Robust.

Physics numbers: windSpeed 7.5 m/s default; boat max ~ 0.85windeff; knots = m/s*1.94384. Rudder turn rate ∝ speed. trim 0..1 default 0.7? Start trim 0.6.

No-go zone: |angle to wind| < 35° → eff ~0.15 (in irons). eff = sstep(25°, 50°, angleFromUpwind)... compute: diff = |wrapAngle(heading - windToward)|; upwind component: if diff > 150° → run (downwind) eff 0.8; hmm sailing: boat can't sail within ~35° of where wind comes FROM. windFrom = windDir+180. angleOffWind = |wrapAngle(heading - windFrom)|; 0 = directly upwind. eff = sstep(28°, 60°, angleOffWind) for upwind curve; downwind (angleOffWind>120) eff = 0.75 + a bit of wing-on-wing... plus gusts noise. targetSpeed = windSpeed * (0.25 + 0.75*effCurve) * trim... plus currents none.

Heel: lateral = sin(angleOffWind) ... heel sign by side: heelTo = clamp(0.32 * eff * (windSpeed/12), 0, 0.5) * side where side = sign(wrapAngle(windFrom - heading)).

Space = ease sheets: trim target *= 0.25 while held.

Turn: heading += rudder * turnRate * (0.35 + speedFactor) * dt; rudder from A/D with auto-return center damping; rudder ∈ [-1,1].

speed += (target - speed) * (1 - exp(-dt*0.5)); pos += forward * speed * dt. forward = (sin(heading), 0, cos(heading))? define heading 0 = +Z? Use forward = (Math.sin(heading), 0, Math.cos(heading)) and heading CCW. Fine.

Attitude: sample wave at 4 points: bow/stern ±L/2 along forward, beam ±B/2; pitch = atan((hBow - hStern)/L); roll = atan((hPort - hStbd)/B); y = avg(h)*? plus base float: boatY = avg + 0.0. Damp actual toward targets. Combine roll with heel. Pitch sign care.

Gull paths around islands: center on random islands + boat follower 2.

Audio graph:

• ctx, master = gain(settings.volume * !muted)
• sea: bufferSource brown noise 2s loop → lowpass 320+wind8 → gSea (0.5 + wind0.04)
• wind: white noise loop → bandpass freq 500 + lfo(0.13Hz)200, Q 0.6 → gWind (wind/16 * 0.5 + speedFactor0.3)
• lfo: osc 0.13Hz → gain 180 → bandpass.frequency
• creaks: setInterval-ish in loop: every 5-9s if speed>2: osc triangle freq 110→70 exp over 0.35s, gain env 0.06 peak; also sail flap? skip.
• update each frame: gains smoothed via setTargetAtTime.

Noise buffers: generate once 2s.

First gesture: pointerdown/keydown once → init audio, resume ctx.

Mute btn + M: muted toggle, update btn text 🔊/🔇.

Now HUD "Helm" pill: Auto (class auto) / Manual.

Edge case: OrbitControls imported; create always, enabled=false; on Orbit mode enable & set target.

Composer: RenderPass, UnrealBloomPass, vignette ShaderPass, OutputPass. Vignette shader: tDiffuse, strength; col = 1 - strengthsmoothstep(0.45,1.15,len(uv-0.5)*1.6)? standard.

Also FXAA? skip (pixelRatio high enough).

Let me now write the files. I'll write p02 in one go.

Also remember settings.foam used in shader uniform each frame.

Time-of-day clock in pill: format hours.

Write p02: env/palette/updateSky, GLSL noise, sky, textures, terrain, lights.

Define colors as THREE.Color and lerpColors per key pair.

SKY_KEYS entries: {h, zen, hor, sun, fog, deep, shal, hemiSky, hemiGnd, sunI} hours: 0 (night), 5 (pre-dawn), 6.5 (sunrise), 9 (morning), 13 (midday), 17.5 (afternoon), 19 (sunset), 20.5 (dusk), 22 (night), wrap to 24=0.

Palettes (hex):

• night 0: zen #050a18, hor #0a1428, sun #1a2a4a (unused), fog #070d18, deep #04121f, shal #0a2836, hemiSky #16243c, hemiGnd #0a0f16, sunI 0
• 5: zen #0a1230, hor #1c2a4a, fog #0d1526, deep #051522, shal #0e3040, hemi #1c2c48/#0c121c, sunI 0
• 6.5 sunrise: zen #2a3d6e, hor #ff9a5c warm, sun #ffb27a, fog #4a4a5e? fog #53405a, deep #06202e, shal #17606a, hemiSky #3a4a6e, gnd #241a20, sunI 1.2
• 9: zen #2f6fb4, hor #a8d4e8, sun #fff2d9, fog #a8c8d8, deep #07354e, shal #1e8a8a, hemiSky #bcd8ea, gnd #4a5a52, sunI 2.6
• 13 midday: zen #1e5fae, hor #9fd2ee, sun #ffffff, fog #a5cfe0, deep #063048, shal #22a5a0, hemi #c2e0f0/#55665c, sunI 3.0
• 17.5: zen #2a5a9a, hor #b8d8e0 → slightly warm, sun #ffe8c0, fog #aec8d0, deep #07304a, shal #1e9090, hemi #b0d0e0/#50584e, sunI 2.4
• 19 sunset: zen #1e2f5e, hor #ff7a3c, sun #ff9a4a, fog #6e4a4a, deep #05202f, shal #1a5a60, hemi #4a3a5e/#201820, sunI 1.1
• 20.5 dusk: zen #0e1a3e, hor #4a3a5e, sun #c06a4a, fog #1e1a2e, deep #041825, shal #0f3a48, hemi #2a2a4a/#12101a, sunI 0.15
• 22: = night-ish blend to 0.

Moon: fixed pale #b8ccf0, intensity 0.22 at night.

updateSky also positions sun/moon lights and sets scene.fog color, sky uniforms, ocean uniforms colors, hemi colors. Called when time changes (every frame ok — cheap lerps; guard: only if hour changed by >1e-4 or forced).

Alright — writing p02 file now. I'll keep code tight.

Also I realize the depth texture should include wave-independent water depth; fine.

toHalfBits standard implementation:

Good enough (heights -26..50).

Terrain: BufferGeometry manual grid or PlaneGeometry rotated -PI/2 then displace Y & colors. Use PlaneGeometry(WORLD_SIZE, WORLD_SIZE, seg, seg), rotateX(-PI/2), then for each vertex set y = sampleHeight(x,z) & color. computeVertexNormals. seg by quality: High 384, Medium 288. Rebuild on quality change.

Terrain colors:

Underwater (y<0): sand→bedrock tint darker by depth. y in [0,1.5]: sand. y in [1.5, 9]: lerp sand→grass by sstep(1.5,4,y); grass hue varied by fbm. slope > 0.55: rock mix. y>18: rock; y>30: snow mix by sstep(26,34,y).

OK writing now. Also remember THREE r160: renderer.outputColorSpace default SRGB; OutputPass handles. useLegacyLights — r160 default false? In r155+, renderer.useLegacyLights default true still... Actually r155 changed default to false. In r160 physically correct lighting is default (useLegacyLights=false), so light intensities in "physical" mode: DirectionalLight intensity ~3 fine, Hemisphere ~0.6.

Now writing p02.

Part 2 done. Now Part 3: ocean shader + meshes, boat construction (hull loft, mast, sail, rigging, cabin, flag), wake ribbon, bow spray particles.

Ocean material factory:

Vertex shader (Gerstner displacement + analytic normals):

Note: geometry is PlaneGeometry rotated -PI/2 so position.y=0, xz local. Then world computed manually; we ignore modelMatrix (mesh at origin). Good.

Fragment:

Wait: depth = -ground where ground<0. Water surface y≈0; terrain height ground. depth = 0 - ground if ground < 0 else 0. float depth = max(-ground, 0.0). Good.

Shoreline foam: depth small → foam. smoothstep(3.0, 0.6, depth) gives 1 when depth<0.6, 0 when >3. Good.

Uniform arrays: THREE supports { value: wavesA } where wavesA is Vector4[]. In r160, uniform arrays of vectors: yes, value: [Vector4,...] works with uniform vec4 uWavesA[6] — set flatShading irrelevant. OK.

Moon uniform needed: add uMoonDir to frag uniforms. I'll include.

The near mesh: PlaneGeometry(1400, 1400, N, N).rotateX(-PI/2). Material A with uOffset updated per frame (snapped). Mesh at origin, frustumCulled = false (positions displaced in shader; bounding sphere wrong otherwise).

Far mesh: PlaneGeometry(9000, 9000, 80, 80) rotateX, material B with uOffset (0,0), uYDrop -0.4 (uniform float applied to world.y). Add uYDrop to both (0 for near).

Also both materials share most uniform value objects (colors etc.) — but each makeOceanMaterial() creates its own uniform dict; I can share the same value objects for colors (references) so updateSky updates both automatically if I assign the same THREE.Color instances. I'll assign value: env.deep etc. — shared references. uSunDir: env.sunDir shared. For per-frame scalars (uTime, uCamPos, uFoam, uSwell, uDay), I'll collect ocean materials in an array oceanMats and update in loop. Simpler: shared uniform objects: create sharedU = { uSwell: {value:1}, uTime:{value:0}, ... } and spread into each material's uniforms along with unique uOffset/uYDrop. Same uniform object reference in two materials — THREE handles fine.

Depth texture: value depthTex shared.

Fog uniforms: uFogColor: {value: env.fog} shared color; uFogNear/Far shared scalars updated from scene.fog.

Camera pos: shared {value: camera.position} — reference to camera.position vector works! uniform value is a Vector3 reference.

Now geometry segment counts by quality: High: near 288, far 96; Medium: near 192, far 64.

buildOcean(scene) disposes old meshes/materials (but shared uniforms persist).

Boat: build via loft.

Let me think hull shape: half-beam profile along t (0 stern, 1 bow):

• t=0 (transom): 0.72
• t=0.35: 1.0 (max beam)
• t=1 (bow): 0.02

w(t) = (1 - smoothstep-ish)... Use: w = Math.sin(Math.acos(clamp((t-0.35)/0.65, 0, 1))) for t>0.35 (ellipse bow taper) and for t<0.35: lerp(0.72, 1, t/0.35 via smooth).

depth(t): keel depth profile: max 1.35 mid, rising at bow and stern: d = (1.0 - 0.55*Math.abs(t-0.42)/0.58) → clamp min 0.35; plus bow rises: d = (1 - 0.5sstep(0.8,1,t)).

deck sheer: deckY(t) = 1.0 + 0.5Math.pow(t,2.2) + 0.15Math.pow(1-t,2).

Ring points (j=0..8): angle from port deck (j=0) down around keel (j=4) up to starboard deck (j=8). Parametrize u = j/4 - 1 ∈ [-1, 0, 1] with intermediate at -0.5,+0.5... Actually ringPts=9: u = [-1,-0.75,-0.5,-0.25,0,0.25,0.5,0.75,1] hmm but that gives flat sections. Better use param a = (j/8)*π: x_local = -cos(a) * w (port at a=0 → x=-w; keel at a=π/2 → x=0; stb at a=π → x=+w). y_local = deckY - sin(a)^0.8 * (deckY + depth) → at a=0: y=deckY; a=π/2: y = -depth; smooth hull curve. Good: 9 points semicircle-ish.

Indices between consecutive sections: quads (i,j)-(i,j+1)-(i+1,j+1)-(i+1,j). Stern cap: fan from section 0 ring center — approximate with a center vertex at (0, (deckY-depth)0.5, -L/2) hmm transom should be flat vertical: cap with triangle fan across ring to center point (0, deckY0.45, z0). Bow: last ring is tiny (w~0.02) — just cap with fan too.

UVs: skip (plain material). computeVertexNormals.

Wood-ish material: MeshStandardMaterial color 0x7a4a2a hull, roughness 0.7; or painted white hull 0xe8e2d4 with accent stripe? Add second mesh: rub rail? Keep simple: hull white 0xdde2e6, interior deck separate mesh: deck plane strip from ring top points — actually the loft ring ends at port/stb deck; deck open. Add deck surface: for each section add quad between (-w0.96, deckY-0.02, z) and (w0.96, ...). Simple: reuse loft function with ring of 2 points (flat strip) — write generic loft(rings) where rings provide array of [x,y] per section. Deck strip = 2 pts per section. Color teak 0x9a6b3f.

Cabin: box 2.6 x 1.1 x 3.4 at z -0.8, color 0xf0ead8, plus roof slight; portholes skip. Cockpit: small box recessed — skip detail, add tiller cylinder at stern.

Mast: cylinder r0.09 h 12.5 at z 0.6, aluminum grey. Boom: cylinder r0.06 l 4.6 rotated X 90° at y 2.6, z from mast back to -4.

Sail: mainsail triangle: PlaneGeometry custom — build BufferGeometry: grid u∈[0,1] along foot (mast→boom end), v∈[0,1] up. Point: apex at mast top (z=0.6, y=13.4), foot from (z=0.6,y=2.6) to (z=-3.9,y=2.75). Position = lerp along: for grid (i,j): x = 0; the triangle: P(u,v) = foot(u) * (1-v) + apex * v, where foot(u) = lerp(mastBase, boomEnd, u). Add draft bulge: y? bulge in +x or -x direction (side): P.x += sin(πu)sin(πv0.9) * draft * side. Grid 10x12, indices, DoubleSide white material with slight sheen; canvas texture with seams: vertical stripes lines — generate 128x128 canvas with subtle horizontal seam lines and number? Keep plain + seams.

Jib: front triangle from bow (z=5.2,y=1.6) to mast top — forestay; jib grid similar smaller.

Rigging: lines via THREE.Line? Use thin cylinders or LineSegments with basic material: forestay (mast top → bow), backstay (mast top → stern), 2 shrouds (mast top → rail mid ±). Use LineSegments simple.

Flag: plane 0.9x0.55 6x4 segs at mast top; CPU wave in loop; color teal #38e0d0 with canvas? plain color.

Nav lights? At night: two tiny emissive spheres (port red, stb green) + white masthead light — cheap wow with bloom. Add: materials emissiveIntensity toggled by env.day (1-day). Yes! tiny detail, nice.

All meshes castShadow = true (except sail maybe true too).

Return { group, sail, jib, flag, updateSail(side, trim) } — sail side flips bulge sign; but with DoubleSide material, flipping geometry sign ok. Update sail bulge per frame via uniform-like CPU loop with preallocated arrays: store base positions Float32Array and recompute x offsets: 10*12 verts *2 sails trivial.

Simpler: keep sail static geometry with bulge = f(u,v)*1 baked; flip tack via group scale.x = ±1 — mirrors whole boat?! No — apply scale.x only to sail meshes... sail mesh scale.x=-1 flips bulge direction; geometry stays. And boom rotates.

But wait: bulge is in local x of sail mesh; heel side determines which side wind pushes. Sail scale.x = side. Boom rotation.y = side * boomAngle(trim). Fine.

Wake ribbon:

Fade via per-vertex alpha attribute in shader. Blending: NormalBlending with transparent, depthWrite false. White foam color modulated by day factor — uniform uDay.

Spray:

I'll write these as classes in p03.

Gulls + audio in p04. Physics/main in p05.

Let me write p03 now. Careful with GLSL template strings inside the JS — I'll use string concatenation via /* glsl */ template literals; nested ${} needed for GLSL_NOISE injection — fine in JS template literals.

Note: p02's skyMat fragment already used ${GLSL_NOISE} — fine.

Ocean shader uniform for moon: add uMoonDir {value: env.moonDir}.

Write p03.

Now Part 4: seagulls + WebAudio ambience.

Gulls: 7 gulls. Each: group with body (small elongated sphere), two wings (thin boxes) hinged. Flight: each gull has a center (island or follows boat), radius, angular speed, phase, height base + bob. Banking into turns. Wing flap: rotation.z = ±flap.

Body: cone rotated? Use: body = SphereGeometry(0.18, 8, 6) scaled (1, 0.7, 2.2); head small sphere + beak cone; wings = BoxGeometry(1.6, 0.03, 0.4) with pivot at root: translate geometry x 0.8. Left wing at x -, rotate flap around z axis of wing group... wings flap around the roll axis (z forward?) — define gull local +z forward: wing extends along ±x, flap rotation.z? For wing at +x side, flapping = rotation around z-axis (forward axis) — rotation.z swings tip up/down. Good.

Gull colors: white body, grey wing tips? single material light grey 0xd8d8d8, beak orange.

Audio:

Brown noise generation: integrate white with leak.

Creak: schedule randomly in main loop when audio.ready && speed>1.5: every 4..9s: osc = ctx.createOscillator type 'triangle', freq 95→62 exp, gain env attack 0.02 to 0.05, decay 0.5; connect master. Also add gentle sail flap noise burst when trim low? Skip — enough.

Then Part 5: physics, cameras, input, GUI, HUD, loader, main loop. Let me also think about what's declared where — boat state object:

updateBoat(dt):

• wind: windRad = settings.windDir * π/180 (direction wind blows TOWARD); windFrom = windRad + π.
• angleOffWind = |wrapAngle(heading - windFrom)| — 0 = pointing into the wind.
• eff curve: inIrons = sstep(0.45, 0.9, angleOffWind in rad? use rad: sstep(0.5, 1.05, angleOffWind)); downwind run bonus: if angleOffWind > 2.6 → eff 0.8. Combined eff = max(inIrons * 0.95, runBonus). Gusts: gust = 0.85 + 0.3fbm(simTime0.05, 0, 2).
• targetSpeed = windSpeed * eff * trim * 0.62 * gust (sailboats ~ 60% wind speed arcade).
• accel: speed += (target - speed) * (1 - exp(-dt * (target > speed ? 0.55 : 0.9))).
• heading += rudder * dt * (0.5 + speed * 0.09) * (speed>0.3 ? 1 : 0.2) — need steerage way.
• rudder dynamics in input: target from keys ±1, rudder lerps; auto-center rate.
• pos.x += sin(heading) * speed * dt; pos.z += cos(heading) * speed * dt.
• side: sign of wind coming: side = wrapAngle(windFrom - heading) > 0 ? 1 : -1 — heel away from wind: heel target = -side * clamp(0.38 * eff * windSpeed/14 * (trim^0.7), 0, 0.45).
• wave attitude: sample waveHeight at bow/stern/port/stbd relative points (rotate by heading): bow = pos + fwd4.5, stern = pos - fwd4.5, port = pos + left1.6, stbd = pos - left1.6 hB, hS, hP, hSb; yT = (hB+hS)/2 - 0.15? Boat floats at average; pitchT = atan2(hB - hS, 9) * 0.8; rollT = atan2(hP - hSb, 3.2)*0.8 + heel. damp: boat.y = damp(boat.y, yT, 4, dt) etc. pitch/roll damped similarly.
• apply to group: group.position.set(pos.x, boatY, pos.z); group.rotation.order = 'YXZ'; rotation.y = heading - ? forward: our boat model: bow at +z (loft t=1 → z = +L/2). forward vector = (sin heading, 0, cos heading) matches rotation.y = heading. rotation.x = -pitch? If bow up when hB > hS: pitch = atan2(hB-hS, L); rotation.x = -pitch (three.js: positive rotation.x pitches bow down since +z forward). Actually rotation.x positive rotates +z toward -y (bow down). Bow up = negative rotation.x. So rotation.x = -pitchT. rotation.z = rollT (port up positive?). Left = (cos h, 0, -sin h)? forward (sin h, 0, cos h); left = (cos h, 0, -sin h) (rotate forward -90°). port point = pos + left*1.6. If hPort > hStbd → boat rolls starboard-down = rotation.z negative? rotation.z positive tilts... rotation.z positive rotates +x toward +y: starboard (+x local? model x+ is starboard? loft: x = -cos(a)*beam with j from port? Eh — I'll determine empirically-ish: roll = atan2(hPort - hStbd, beam); rotation.z = roll makes port rise? Fine — visual damped anyway, sign flip unnoticeable. I'll set rotation.z = rollT and heel included.
• Grounding: terrainH = sampleHeight(pos.x, pos.z); clearance = -terrainH (water depth). If terrainH > -1.4: compute gradient gx = sampleHeight(x+3,z)-sampleHeight(x-3,z), gz similarly; push: pos.x -= gxnormk*dt... plus speed = (1 - 2dt) min 0; toast throttled 6s "⚠️ Shallow water — she's aground!".
• World bounds: r = hypot(x,z); if r > 1450: push toward center gently + toast.
• Wake update with stern pos; spray spawn ∝ speed when speed > 3: rate = (speed-3)*3 per sec: accumulate; spawn at bow pos ± random side, vel outward+up.

Autopilot: waypoints ring: generate from ISLANDS — points between islands at safe water: fixed list: [[-300,260],[480,-300],[700,420],[ -80,760],[-760,260],[-240,-700],[420,-760]] hmm risky; instead compute waypoints as midpoints of consecutive islands pairs then push outward from island by min distance check with sampleHeight — do at init after bake: for each candidate, walk from midpoint away from each island until depth>8. Simpler robust: predefined offsets that I can't verify... Let me do the computed approach: take island list, waypoint[i] = point on circle around island i at distance r*2.6 (beyond shelf 2.1r), angle = atan2 to next island — guaranteed depth? shelf extends to 2.1r with height up to -3.2 at shelf edge... at 2.6r we're past shelf → base seabed -26±2.5 → depth > 20. Safe. 9 islands → 9 waypoints, tour in order. Autopilot: steer rudder = clamp(wrapAngle(targetHeading - heading) * 1.5, -1, 1); auto trim = clamp(0.35 + eff..., ... ) just trim target 0.85; when within 70m → next waypoint. Toast "Autopilot engaged — laying course for Island 3". Also sails auto.

Cameras implementation:

• Chase: desired = boatPos - fwdcos(pitch)distR(yaw?) ... drag adds yaw offset around boat: offsetDir = heading + π + yaw; pos = boat + (sin(offsetDir)d, height, cos(offsetDir)d) where d = distcos(pitch), height = distsin(pitch)+2. damp camera.position toward desired (3/s), look damp toward boat + up2 + fwd*4.
• Orbit: controls.target damp to boatPos+up*2; controls handles camera; enabled only in orbit.
• Cinematic: t+=dt; slow orbit r = 24+10sin(t0.11), ang = t0.09; height = 5+4sin(t*0.07+2); occasionally low near water: height = max(2.2, ...). pos = boat + (cos(ang)*r, h, sin(ang)r); look at boat + fwd6.

Pointer input: canvas pointerdown/move/up: dragging → yaw -= dx0.005; pitch clamp(0.08..1.2) += dy0.005 (only Chase & Cinematic? apply to Chase; Cinematic ignore drag; Orbit → OrbitControls handles). Wheel: dist = 1+dy0.001 clamp 10..70 (Chase only; Orbit controls handles wheel itself).

Keys: track set of down keys. W/S adjust trimTarget ±dt*0.7 clamp 0..1; Space → sheets eased: effective trim *= 0.3. A/D → rudderTarget ±1 (else 0). C → cycle camera; V → autopilot toggle; M → mute; P → snapshot.

GUI: folders: Ocean (swell 0..1.6, foam 0..2), Sky (timeOfDay 0..24 step .1, cycle, cycleSpeed 0..1.5, clouds 0..1), Wind (windSpeed 2..16, windDir 0..360), Helm (autopilot, camera dropdown, trim readout?), Effects (bloom 0..1.2, vignette 0..1, quality dropdown → applyQuality(), volume 0..1, muted), actions: snapshot(), locate? Keep: Snapshot button.

HUD update fn every 0.15s: stats.innerHTML with rows: Speed, Wind, Heading, Depth, FPS. Clock pill: HH:MM from timeOfDay. Helm pill text/class. Cam pill.

Toast: showToast with timer.

Loader flow:

Wrap heavy steps in await new Promise(requestAnimationFrame) to let loader paint.

Main loop with clock: dt = min(clock.getDelta(), 0.05); simTime += dt; settings.timeOfDay advance if cycle: += dt * cycleSpeed/60 (game-hours per real second: cycleSpeed per minute → /60). updateWavePhases(); physics; visuals; sky updateSky(timeOfDay) (cheap guard: only if |Δ|>0.002); sun light position = boat.pos + sunDir*900, target boat.pos; hemi colors; nav lights emissiveIntensity = (1-day)*3; oceanShared.uTime.value = simTime; uSwell, uFoam, uDay update; uCamPos copy camera.position; uFogNear/Far from scene.fog (fixed); wake.mat.uDay; spray uDay; skyDome.position.copy(camera.position); sky uniforms uTime, uClouds, uDay; sail update (side, trimEff); boom rotation.y = side * lerp(0.15, 1.25, 1-trim...)? Boom angle: more eased → wider: boomAngle = side * (0.12 + (1-trim)*0.9) with ease smoothing; flag wave; gulls; audio.update; cameras; hud; composer.render().

FPS counter: frames counter each second.

Renderer: antialias true, ACESFilmicToneMapping, exposure 1.05, shadowMap PCFSoft, setPixelRatio by quality (High: min(dpr,2), Medium: min(dpr,1.5)).

Composer with bloom (strength settings.bloom) + vignette ShaderPass + OutputPass.

Vignette shader:

Need to use ShaderPass — imported? Not in p01 imports! Imports: EffectComposer, RenderPass, UnrealBloomPass, OutputPass, GUI, OrbitControls. No ShaderPass. I can add the import in p05? No — imports must be at top of module (they're hoisted; ES imports can appear anywhere top-level in module... Actually import statements must be at top level but can be anywhere in module — they hoist. I'll add import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js'; in p05 top-level. It works since all parts are concatenated into one module scope. Fine, but cleaner to note. Yes it works.

Snapshot: composer.render() then canvas.toBlob → URL.createObjectURL → a.click. Note: toBlob on the WebGL canvas requires render before (same frame) — do synchronously: composer.render(); renderer.domElement.toBlob(...). preserveDrawingBuffer not needed if same task. OK.

Spawn finder: after bake: candidates along spiral from (-300, 260): search grid: for r in 0..600 step 20, angles: p = center + polar; check sampleHeight < -12 → choose. Simple loop fine.

Also initial camera position set behind boat.

Resize: camera aspect, renderer.setSize, composer.setSize.

Visibility: when tab hidden, clock delta clamp handles.

One more: updateSail per frame does computeVertexNormals on 99 verts ×2 sails — fine.

Boom: boomGroup.rotation.y = -side * boomAng? Boom extends toward -z from mast; sail on boom. Heel side: boom swings to leeward. rotation.y sign — visually symmetric anyway; use rotation.y = side * ang smoothed.

Flag: wave: flagGeo positions: x from 0..0.95; z = sin(x6 - t8)0.06(x/0.95). Update each frame (7*4 verts). Rotate flag to leeward: flag.rotation.y = heading-relative wind: world wind toward windRad; flag local rotation.y = wrapAngle(windRad - heading) + π? Flag streams downwind: local angle = wrapAngle(windToward - heading). Set flag.rotation.y = that.

Gulls class:

Gull mesh:

• body: SphereGeometry(0.22,8,6) scale(0.8,0.7,2.4) white
• head: sphere 0.13 at (0,0.12,0.5)
• beak: cone(0.05,0.18) rotateX(PI/2) at (0,0.1,0.68) orange
• tail: box(0.16,0.02,0.3) at (0,0.02,-0.55)
• wings: BoxGeometry(1.5,0.03,0.42) translate(±0.75,0,0) in wing groups at (±0.1,0.1,0.1), color 0xcfd4d8 Scale whole gull 1.3.

Audio class:

Audio init on first pointerdown/keydown (once listener) + on btn-sound click (unmute path). Mute: master.gain.setTargetAtTime(0).

Creak scheduling in loop: nextCreak timer.

Now write p04 (gulls + audio).

*************************************************************************************************************************************************************************************ex.

Wait — there's an issue: import { ShaderPass } in the middle of the module. ES module imports are hoisted, so it works, but it must be top-level statement — it is (module top-level). OK, valid.

But there's a subtle issue: oceanNear.material.uniforms.uOffset — when I call buildOcean from applyQuality, oceanNear is recreated; fine.

_v1/_v2 are declared with const AFTER updateCamera function definition but used inside it — that's fine because the function is called after declaration executes (const hoisting TDZ only matters if called before declaration line executes; loop starts after init() at end).

wake.mat — I named the property mat in Wake class. Yes: this.mat. Spray also this.mat. Good.

In updateBoat, boatRig is used — set in init before loop. OK.

sprayAcc and boomAng declared with let after updateBoat — used inside function only, fine.

Issue: In p05 I used orbit.target.lerp(_v1.set(...)) — _v1 declared after — again fine at call time.

Issue: lights.sun.color.copy(day > 0.02 ? env.sunColor : _cA.setHex(0x8aa8d8)); — _cA is defined in p02, in scope. OK.

handleKeys uses keys set. OK.

Now concatenate all parts and syntax-check with node. Extract the module script content and run node --check? The script is an ES module with imports from 'three' — node --check just parses; imports parse fine in .mjs. Let me extract script content between <script type="module"> and </script> (last one) and save as .mjs, then node --check.

Also check: p01 ended with bakeHeightmap function — no closing tags; p02-p05 continue the module. Good.

One concern: updateSail in p03 uses flutter computed from base[0].u — constant; harmless.

Another check: makeSail for jib: footA=[0,1.6,5.1], footB=apex=[0,12.6,0.85] — so the "foot" line goes from bow up to masthead: u along that line, v toward apex which equals footB... So v blends from line to apex point — jib is a triangle with vertices bow, masthead... wait foot(u) lerps bow→masthead; apex = masthead. So P(u,v) = lerp(foot(u), apex, v): at v=1 all points = apex → triangle. Good. But segU=1 means u ∈ {0, 0.5, 1}? segU=1 → i from 0..1 → u ∈ {0,1} → two columns: bow (u=0) and masthead (u=1, where foot=apex → degenerate line). So jib = triangle bow–masthead–masthead. That means the sail area at v=0 between u=0 (bow) and u=1 (masthead) — it's a triangle strip degenerating. OK: jib triangle with vertices (bow, masthead, masthead). Hmm, that's a triangle along the forestay with zero width? No: at v=0, row spans bow→masthead (the forestay line); at v=1, everything at masthead. So the jib is a flat triangle with one edge = forestay and apex = masthead... but both ends are ON the forestay — the triangle is degenerate (zero area)? No wait: vertices: u=0,v=0 → bow point (0,1.6,5.1); u=1,v=0 → masthead (0,12.6,0.85); v=1 → masthead. All points lie on the line bow→masthead — completely degenerate! The draft bulge in updateSail adds x offset: belly = sin(π u) sin(π v·1.15) — at u=0 or 1, zero; middle gives bulge. So the jib becomes a curved sliver around the forestay — actually like a thin luff sail. It'll look like a thin strip — acceptable-ish but not great. Let me improve: make the jib a proper triangle: foot from bow (0,1.6,5.1) to tack point near mast base (0,2.2,0.9), apex at (0,11.5,0.95) partway up mast. Then footA=[0,1.9,5.1], footB=[0,2.2,0.9], apex=[0,11.6,0.95]. That gives a real fore-triangle sail. Let me fix that in p03.

Also updateSail(mesh, side, trim, gustT): flutter uses base[0].u — fine.

In makeSail, positions x all 0; bulge in updateSail sets x via pos.setX. Initial render before first update — x=0 flat; fine, loop updates immediately.

Also in updateSail: pos.setX(i, b.x + (belly*draft*side + luff) * (0.35 + 0.65*trim + 0.3)) — factor 0.35+0.65*trim+0.3 ranges 0.65..1.3 — always some belly. OK.

Fix jib line now via replace.

Also one bug: in p05 updateBoat — when settings.autopilot true, handleKeys returns early, and rudder set by autopilot. But boat.trim stays manual (used only when not autopilot — autopilot uses trimTarget 0.9). Fine.

toggleAutopilot from GUI onChange: GUI sets settings.autopilot then calls toggleAutopilot which flips it again — bug! The GUI checkbox settings.autopilot changes value first, then my toggle flips it → out of sync. Fix: make toggleAutopilot accept optional value:

GUI onChange passes the new value: .onChange(v => toggleAutopilot(v)). And keyboard calls toggleAutopilot(). Fix.

Similarly mute GUI: I handled via applyVolume + button text only — settings.muted already set by GUI. OK.

Camera GUI onChange: sets settings.camera, then my handler updates UI — no double toggle. OK.

Also in keydown 'KeyV' → toggleAutopilot() — fine with optional param.

Next: concatenate and node --check. Then copy to /space and update index page.

Potential runtime issues to double check after syntax pass:

1. p01 settings.quality uses matchMedia — fine.
2. buildTerrain disposes material — but terrain uses MeshStandardMaterial created inside. OK.
3. applyQuality() is called in init AFTER buildOcean — it calls buildTerrain + buildOcean again (since depthTex exists). That's wasteful (rebuilds) but OK; actually it re-creates with correct pixel ratio. It also calls onResize. Fine but doubles build time slightly. Acceptable.
4. In p03 buildOcean — for (const m of oceanMats) m.dispose(); then recreate. OK.
5. oceanNear.userData.step used in loop — set in buildOcean. If quality changes, rebuilt and step updated. OK.
6. Wake: geometry has WAKE_MAX*2 verts; setDrawRange((n-1)*6) indices — index buffer has (WAKE_MAX-1)*6 entries. OK.
7. Gull.update — waveHeight available. this.center.set(...) when island mode: const target = this.mode === 'boat' ? boatPos : this.center.set(...) — works.
8. Spray shader: attribute declarations attribute float aAlpha, aSize; — GLSL allows comma-separated attribute declarations in WebGL1 GLSL? attribute float aAlpha, aSize; is valid GLSL ES 1.0. Three.js ShaderMaterial prepends attribute declarations for position etc. — comma declaration should compile. To be safe, split into two lines. I'll fix.
9. Ocean fragment: all(greaterThan(duv, vec2(0.0))) — valid GLSL.
10. In OCEAN_VERT I used ${NW} interpolations — p03 template literal — NW=6. Loops i < 6. Uniform array uWavesA[6]. Good.
11. renderer.domElement wheel listener passive — fine.
12. bloom pass with HDR values — sun disc *6 etc. tone mapping in OutputPass. Bloom threshold 0.86 — sun glints exceed. Good.
13. scene.add(skyDome) — skyDome is const created in p02 at module level — created before renderer; fine.
14. env.sunDir used as uniform value directly — shared reference, updates propagate. But skyMat.uniforms.uSunDir.value = env.sunDir — set at creation; since updateSky mutates env.sunDir in place (set()), the reference stays valid. I used .set()/.normalize() — yes in-place. Colors: lerpKeyColor mutates env colors in place via lerpColors. Good.
15. lights.sun.position.copy(boat.pos) — boat.pos is Vector3. addScaledVector day>0.02 ? env.sunDir : env.moonDir. Operator precedence: .addScaledVector(day > 0.02 ? env.sunDir : env.moonDir, 1000) — ternary as first arg — correct as written (parenthesized in code? I wrote addScaledVector(day > 0.02 ? env.sunDir : env.moonDir, 1000) — ternary binds looser than comma? No — comma separates args; ternary is fine as an argument expression. OK.
16. Shadow: sun.position 1000 away, shadow camera far 2200, near 50 — boat at target. Shadow box ±90 around origin of light's ortho — the light target at boat, position boat+dir*1000: shadow camera looks from light to target; ±90 covers boat surroundings. Terrain islands beyond 90m won't cast/receive proper shadows but receiveShadow still samples shadowmap — outside frustum returns lit. Acceptable.
17. renderer.shadowMap.enabled with ShaderMaterial ocean — no shadow chunks, fine.
18. camera.far = 16000 vs sky dome 7200 radius — inside. Fog far 4200 doesn't affect sky (fog:false). Good.
19. Terrain at WORLD_SIZE 3200 — beyond that, ocean far plane 9200 covers; horizon at 4600 — sky dome 7200. OK.
20. import GUI from 'three/addons/libs/lil-gui.module.min.js' — in importmap "three/addons/" → jsdelivr examples/jsm/ — lil-gui at examples/jsm/libs/lil-gui.module.min.js — exists in three 0.160.0. Yes.
21. EffectComposer etc. — standard paths OK.

One more: p05 uses oceanNear.material.uniforms.uOffset — ShaderMaterial created by makeOceanMaterial includes uOffset. OK.

wake.update(...) called with (x,y,z,speed,tNow) — signature (x, y, z, speed, tNow). OK.

In updateBoat, sprayAcc/boomAng are declared AFTER updateBoat definition via let sprayAcc = 0, boomAng = 0; — used only inside functions called later. OK.

const clock = new THREE.Clock(); — but I also have DOM element clockEl = $('clock'). Name collision: clockEl fine; clock const — no DOM id conflict (id="clock" is element, not variable). OK.

HUD fmtTime — timeOfDay float. OK.

updateHUD uses sampleHeight — fine.

Edge: settings.camera initial 'Chase'; pill camname initial 'Chase' — matches HTML.

toggleMute — btn-sound text flips. Initially sound not muted; classList 'on' added. OK.

Audio: audio.init() on keydown/pointerdown. Note keydown fires on any key — creates AudioContext before gesture? keydown IS a user gesture. OK.

Now also fix: p03 jib geometry (degenerate), spray attribute declaration split, p05 toggleAutopilot(v) + GUI onChange param.

Then assemble + check + deploy.

****************************************************************************************************************on.

*****************************************************************************************************************************************ss.

Everything verified:

• Complete 1778-line demo deployed to /space/demos/009-azure-odyssey/index.html (83.1 KB)
• Valid HTML structure, valid JS syntax (node --check passed)
• All key sections present
• Index page updated with the 009 card

Task complete. Call _success now — I'm at ~92% of time.