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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" />
<title>Jeep in Jungle</title>
<style>
:root {
--panel: rgba(10, 14, 10, 0.46);
--panel-strong: rgba(8, 12, 8, 0.72);
--line: rgba(255, 255, 255, 0.14);
--accent: #e2452f;
--accent-soft: #ff7a5c;
--text: #f3efe6;
--muted: rgba(243, 239, 230, 0.62);
}
* {
box-sizing: border-box;
}
html,
body {
margin: 0;
padding: 0;
height: 100%;
overflow: hidden;
background: #0a0f0a;
color: var(--text);
font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
-webkit-font-smoothing: antialiased;
}
canvas {
display: block;
}
/* rich cinematic golden-hour grade + vignette */
#grade {
position: fixed;
inset: 0;
z-index: 15;
pointer-events: none;
background:
radial-gradient(130% 100% at 50% 42%, transparent 50%, rgba(18, 14, 4, 0.40) 100%),
radial-gradient(65% 42% at 72% 10%, rgba(255, 200, 100, 0.18), transparent 60%),
linear-gradient(180deg, rgba(255, 230, 170, 0.08), rgba(30, 50, 20, 0.08));
mix-blend-mode: soft-light;
}
#vig {
position: fixed;
inset: 0;
z-index: 16;
pointer-events: none;
background: radial-gradient(110% 85% at 50% 50%, transparent 55%, rgba(4, 8, 2, 0.52) 100%);
}
#app {
position: fixed;
inset: 0;
}
.hidden {
display: none !important;
}
/* ---------- Start screen (Ultra-Premium Redesign) ---------- */
#start {
position: fixed;
inset: 0;
z-index: 40;
display: flex;
align-items: center;
justify-content: center;
background:
radial-gradient(120% 90% at 50% 20%, rgba(226, 69, 47, 0.16), transparent 60%),
radial-gradient(90% 80% at 80% 80%, rgba(30, 90, 50, 0.40), transparent 65%),
linear-gradient(160deg, #070e08 0%, #0d160f 45%, #050906 100%);
transition: opacity .8s ease;
overflow-y: auto;
padding: 20px;
}
#start .wrap {
width: min(940px, 94vw);
padding: 42px 48px;
border: 1px solid rgba(255, 255, 255, 0.14);
border-radius: 24px;
background: rgba(16, 22, 17, 0.78);
backdrop-filter: blur(20px);
-webkit-backdrop-filter: blur(20px);
box-shadow: 0 40px 100px rgba(0, 0, 0, .75), 0 0 40px rgba(226, 69, 47, 0.12);
position: relative;
}
.brand-badge {
display: inline-flex;
align-items: center;
gap: 8px;
padding: 6px 14px;
border-radius: 30px;
background: rgba(226, 69, 47, 0.15);
border: 1px solid rgba(226, 69, 47, 0.4);
color: #ff8c7a;
font-size: 11.5px;
font-weight: 700;
letter-spacing: .12em;
text-transform: uppercase;
margin-bottom: 16px;
}
#start h1 {
margin: 0;
font-size: clamp(32px, 5vw, 54px);
letter-spacing: -0.03em;
line-height: 1.05;
font-weight: 900;
color: #ffffff;
}
#start h1 span {
background: linear-gradient(135deg, #ff7a63, #ffaa00);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
}
#start p.sub {
margin: 14px 0 24px;
color: rgba(255, 255, 255, 0.72);
font-size: clamp(14px, 1.6vw, 16.5px);
max-width: 66ch;
line-height: 1.6;
}
/* Author Showcase Bar */
.author-card {
display: flex;
align-items: center;
justify-content: space-between;
flex-wrap: wrap;
gap: 16px;
padding: 16px 22px;
background: rgba(255, 255, 255, 0.04);
border: 1px solid rgba(255, 255, 255, 0.09);
border-radius: 16px;
margin-bottom: 28px;
}
.author-info {
display: flex;
align-items: center;
gap: 12px;
}
.author-avatar {
width: 48px;
height: 48px;
border-radius: 50%;
background: linear-gradient(135deg, #e2452f, #ff9b2a);
padding: 2px;
box-shadow: 0 4px 16px rgba(226, 69, 47, 0.45);
flex-shrink: 0;
}
.author-avatar img {
width: 100%;
height: 100%;
object-fit: cover;
border-radius: 50%;
display: block;
}
.author-details .name {
font-size: 16px;
font-weight: 800;
color: #ffffff;
letter-spacing: -0.01em;
}
.author-details .role {
font-size: 12px;
color: rgba(255, 255, 255, 0.55);
text-transform: uppercase;
letter-spacing: .08em;
}
.author-links {
display: flex;
align-items: center;
gap: 10px;
}
.social-btn {
display: inline-flex;
align-items: center;
gap: 8px;
padding: 8px 16px;
border-radius: 10px;
font-size: 13px;
font-weight: 700;
text-decoration: none;
transition: all 0.2s ease;
border: 1px solid transparent;
}
.social-btn.github {
background: rgba(255, 255, 255, 0.08);
border-color: rgba(255, 255, 255, 0.2);
color: #ffffff;
}
.social-btn.github:hover {
background: rgba(255, 255, 255, 0.2);
color: #ffffff;
transform: translateY(-2px);
box-shadow: 0 6px 20px rgba(255, 255, 255, 0.2);
}
.social-btn.linkedin {
background: rgba(10, 102, 194, 0.2);
border-color: rgba(10, 102, 194, 0.45);
color: #70b5ff;
}
.social-btn.linkedin:hover {
background: #0a66c2;
color: #ffffff;
transform: translateY(-2px);
box-shadow: 0 6px 20px rgba(10, 102, 194, 0.4);
}
.social-btn svg {
width: 16px;
height: 16px;
fill: currentColor;
}
.row {
display: flex;
flex-wrap: wrap;
gap: 26px;
align-items: center;
justify-content: space-between;
}
.qual label {
display: block;
font-size: 11px;
letter-spacing: .16em;
text-transform: uppercase;
color: rgba(255, 255, 255, 0.5);
margin-bottom: 8px;
}
.seg {
display: flex;
border: 1px solid rgba(255, 255, 255, 0.12);
border-radius: 12px;
overflow: hidden;
background: rgba(0, 0, 0, 0.25);
}
.seg button {
background: transparent;
border: 0;
color: rgba(255, 255, 255, 0.6);
padding: 12px 22px;
font-size: 13.5px;
cursor: pointer;
font-weight: 700;
letter-spacing: .03em;
transition: .2s;
}
.seg button.on {
background: linear-gradient(180deg, #e2452f, #b82d19);
color: #fff;
box-shadow: 0 4px 14px rgba(226, 69, 47, 0.4);
}
.seg button:hover:not(.on) {
background: rgba(255, 255, 255, 0.08);
color: #fff;
}
#startBtn {
background: linear-gradient(135deg, #ff543d, #e2452f);
border: 0;
color: #fff;
padding: 16px 44px;
border-radius: 14px;
font-size: 16.5px;
font-weight: 800;
letter-spacing: .04em;
cursor: pointer;
box-shadow: 0 12px 36px rgba(226, 69, 47, .45);
transition: all .2s ease;
}
#startBtn:hover {
transform: translateY(-2px) scale(1.02);
box-shadow: 0 18px 48px rgba(226, 69, 47, .60);
}
#startBtn:disabled {
opacity: .55;
cursor: progress;
transform: none;
}
.keys {
margin-top: 26px;
display: grid;
grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
gap: 10px 20px;
font-size: 12.5px;
color: rgba(255, 255, 255, 0.65);
border-top: 1px solid rgba(255, 255, 255, 0.1);
padding-top: 22px;
}
.keys kbd {
background: rgba(255, 255, 255, 0.12);
border: 1px solid rgba(255, 255, 255, 0.25);
border-radius: 6px;
padding: 2px 7px;
color: #fff;
font-family: inherit;
font-weight: 700;
font-size: 11.5px;
box-shadow: 0 2px 0 rgba(0, 0, 0, 0.4);
display: inline-block;
min-width: 24px;
text-align: center;
margin-right: 6px;
}
#bar {
height: 4px;
border-radius: 4px;
background: rgba(255, 255, 255, .1);
margin-top: 22px;
overflow: hidden;
}
#barFill {
height: 100%;
width: 0%;
background: linear-gradient(90deg, var(--accent), var(--accent-soft));
transition: width .25s;
}
#loadTxt {
font-size: 12px;
color: var(--muted);
margin-top: 9px;
letter-spacing: .05em;
}
/* ---------- HUD ---------- */
#hud {
position: fixed;
inset: 0;
z-index: 20;
pointer-events: none;
opacity: 0;
transition: opacity .7s ease;
}
#hud.on {
opacity: 1;
}
.panel {
background: var(--panel);
border: 1px solid var(--line);
border-radius: 14px;
backdrop-filter: blur(9px);
box-shadow: 0 8px 26px rgba(0, 0, 0, .3);
}
#speedo {
position: absolute;
right: 22px;
bottom: 22px;
padding: 14px 20px 12px;
min-width: 168px;
text-align: right;
}
#spd {
font-size: 44px;
font-weight: 800;
line-height: .92;
letter-spacing: -0.03em;
font-variant-numeric: tabular-nums;
}
#spdU {
font-size: 11px;
letter-spacing: .22em;
color: var(--muted);
margin-top: 5px;
}
#gearRow {
display: flex;
gap: 6px;
justify-content: flex-end;
margin-top: 11px;
}
#gearRow div {
font-size: 11px;
font-weight: 800;
color: rgba(255, 255, 255, .26);
width: 20px;
text-align: center;
}
#gearRow div.on {
color: var(--accent-soft);
}
.bars {
margin-top: 11px;
display: grid;
gap: 5px;
}
.bwrap {
height: 5px;
background: rgba(255, 255, 255, .11);
border-radius: 3px;
overflow: hidden;
}
.bwrap i {
display: block;
height: 100%;
width: 0%;
border-radius: 3px;
transition: width .08s linear;
}
#thr i {
background: #78d18a;
}
#brk i {
background: #ef5b45;
}
#topleft {
position: absolute;
left: 22px;
top: 20px;
padding: 12px 16px;
font-size: 12.5px;
line-height: 1.75;
min-width: 180px;
}
#topleft .k {
color: var(--muted);
display: inline-block;
min-width: 74px;
}
#topleft .v {
font-weight: 700;
}
.dot {
display: inline-block;
width: 7px;
height: 7px;
border-radius: 50%;
background: rgba(255, 255, 255, .2);
margin-right: 6px;
vertical-align: middle;
}
.dot.on {
background: #ffd479;
box-shadow: 0 0 9px #ffd479;
}
#notice {
position: absolute;
left: 50%;
top: 34px;
transform: translateX(-50%);
padding: 9px 20px;
font-size: 13px;
font-weight: 700;
letter-spacing: .08em;
text-transform: uppercase;
opacity: 0;
transition: opacity .35s;
}
#notice.show {
opacity: 1;
}
#tip {
position: absolute;
left: 50%;
bottom: 26px;
transform: translateX(-50%);
padding: 10px 20px;
font-size: 12.5px;
color: var(--muted);
opacity: 0;
transition: opacity .5s;
text-align: center;
}
#tip.show {
opacity: 1;
}
#tip b {
color: var(--text);
}
#warn {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
padding: 14px 26px;
font-size: 15px;
font-weight: 700;
color: #ffd0c4;
border-color: rgba(226, 69, 47, .5);
background: rgba(60, 12, 6, .6);
opacity: 0;
transition: opacity .3s;
}
#warn.show {
opacity: 1;
}
#pause {
position: fixed;
inset: 0;
z-index: 30;
display: flex;
align-items: center;
justify-content: center;
background: rgba(5, 9, 6, .66);
backdrop-filter: blur(6px);
}
#pause div {
text-align: center;
}
#pause h2 {
font-size: 38px;
margin: 0 0 10px;
letter-spacing: -.02em;
}
#pause p {
color: var(--muted);
font-size: 14px;
margin: 0;
}
#compass {
position: absolute;
left: 50%;
top: 18px;
transform: translateX(-50%);
padding: 6px 16px;
font-size: 12px;
letter-spacing: .18em;
font-weight: 700;
color: var(--muted);
}
#touch {
position: fixed;
inset: 0;
z-index: 22;
pointer-events: none;
}
.tbtn {
position: absolute;
pointer-events: auto;
width: 74px;
height: 74px;
border-radius: 50%;
background: rgba(255, 255, 255, .09);
border: 1px solid var(--line);
backdrop-filter: blur(6px);
display: flex;
align-items: center;
justify-content: center;
font-size: 20px;
font-weight: 800;
color: var(--text);
user-select: none;
-webkit-user-select: none;
touch-action: none;
}
.tbtn:active {
background: rgba(226, 69, 47, .55);
}
#err {
position: fixed;
inset: 0;
z-index: 60;
display: flex;
align-items: center;
justify-content: center;
padding: 30px;
background: #0b0f0c;
text-align: center;
}
#err div {
max-width: 520px;
}
#err h2 {
color: var(--accent-soft);
}
#err p {
color: var(--muted);
line-height: 1.6;
font-size: 14px;
}
</style>
</head>
<body>
<div id="app"></div>
<div id="grade"></div>
<div id="vig"></div>
<!-- ================= START SCREEN ================= -->
<div id="start">
<div class="wrap">
<div class="brand-badge">⚡ 4X4 ULTRA REALISTIC SIMULATOR</div>
<h1>Jeep in <span>Jungle</span></h1>
<p class="sub">An atmospheric, highly polished 3D off-road driving simulation through dense tropical jungle
terrain. Experience realistic vehicle physics, dynamic suspension, mud trails, stream crossings, and
custom engine sound effects.</p>
<!-- Creator / Author Card -->
<div class="author-card">
<div class="author-info">
<div class="author-avatar">
<img src="https://github.com/reactjay.png"
alt="reactjay" onerror="this.onerror=null; this.src='https://api.dicebear.com/7.x/bottts/svg?seed=reactjay';">
</div>
<div class="author-details">
<div class="name">reactjay</div>
<div class="role">Creator</div>
</div>
</div>
<div class="author-links">
<a href="https://github.com/reactjay" target="_blank" rel="noopener"
class="social-btn github">
<svg viewBox="0 0 24 24">
<path
d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.53 1.032 1.53 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z" />
</svg>
GitHub
</a>
</div>
</div>
<div class="row">
<div class="qual">
<label>Graphics Quality</label>
<div class="seg" id="qseg">
<button data-q="low">Low</button>
<button data-q="medium">Medium</button>
<button data-q="high" class="on">High (4K)</button>
</div>
</div>
<button id="startBtn" disabled>Preparing Simulation…</button>
</div>
<div id="bar">
<div id="barFill"></div>
</div>
<div id="loadTxt">Loading 3D engine & terrain assets…</div>
<div class="keys">
<div><kbd>W</kbd> <kbd>↑</kbd> Accelerate</div>
<div><kbd>S</kbd> <kbd>↓</kbd> Brake / Reverse</div>
<div><kbd>A</kbd> <kbd>D</kbd> Steer Left / Right</div>
<div><kbd>Space</kbd> Handbrake</div>
<div><kbd>K</kbd> <kbd>B</kbd> Horn (Beep Beep!)</div>
<div><kbd>C</kbd> Cycle Camera View</div>
<div><kbd>V</kbd> Undercarriage Cam</div>
<div><kbd>H</kbd> Headlights Toggle</div>
<div><kbd>R</kbd> Reset Vehicle</div>
<div><kbd>P</kbd> <kbd>Esc</kbd> Pause Game</div>
<div><kbd>M</kbd> Mute Audio</div>
<div><kbd>Drag</kbd> Rotate Camera</div>
</div>
</div>
</div>
<!-- ================= HUD ================= -->
<div id="hud">
<div id="compass" class="panel">N</div>
<div id="topleft" class="panel">
<div><span class="k">Camera</span><span class="v" id="hCam">Chase</span></div>
<div><span class="k">Lights</span><span class="v"><span class="dot" id="hLampDot"></span><span
id="hLamp">Off</span></span></div>
<div><span class="k">Surface</span><span class="v" id="hSurf">Dirt</span></div>
<div><span class="k">Loop</span><span class="v" id="hLap">0 · 0%</span></div>
</div>
<div id="speedo" class="panel">
<div id="spd">0</div>
<div id="spdU">KM / H</div>
<div id="gearRow">
<div data-g="P">P</div>
<div data-g="R">R</div>
<div data-g="N">N</div>
<div data-g="D" class="on">D</div>
</div>
<div class="bars">
<div class="bwrap" id="thr"><i></i></div>
<div class="bwrap" id="brk"><i></i></div>
</div>
</div>
<div id="notice" class="panel">Chase camera</div>
<div id="tip" class="panel"><b>W</b> drive · <b>A D</b> steer · <b>C</b> cameras · <b>V</b> undercarriage ·
<b>R</b>
reset</div>
<div id="warn" class="panel">Jeep overturned — press <b>R</b> to recover</div>
</div>
<div id="touch" class="hidden">
<div class="tbtn" id="tLeft" style="left:24px;bottom:34px;">◀</div>
<div class="tbtn" id="tRight" style="left:118px;bottom:34px;">▶</div>
<div class="tbtn" id="tGas" style="right:24px;bottom:120px;">▲</div>
<div class="tbtn" id="tBrake" style="right:24px;bottom:34px;">▼</div>
<div class="tbtn" id="tCam" style="right:118px;bottom:34px;font-size:14px;">CAM</div>
</div>
<div id="pause" class="hidden">
<div>
<h2>Paused</h2>
<p>Press P or Esc to continue</p>
</div>
</div>
<div id="err" class="hidden">
<div>
<h2>WebGL unavailable</h2>
<p id="errMsg">This experience needs WebGL. Try a modern desktop browser with hardware acceleration enabled.
</p>
</div>
</div>
<script type="importmap">
{ "imports": {
"three": "https://unpkg.com/three@0.169.0/build/three.module.js",
"three/addons/": "https://unpkg.com/three@0.169.0/examples/jsm/"
} }
</script>
<script type="module">
import * as THREE from 'three';
import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
import { UnrealBloomPass } from 'three/addons/postprocessing/UnrealBloomPass.js';
import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';
import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';
/* =========================================================================
0. BOOT GUARD
========================================================================= */
function fail(msg) {
const e = document.getElementById('err'); e.classList.remove('hidden');
if (msg) document.getElementById('errMsg').textContent = msg;
document.getElementById('start').classList.add('hidden');
}
try {
const c = document.createElement('canvas');
if (!(c.getContext('webgl2') || c.getContext('webgl'))) throw new Error('no ctx');
} catch (e) { fail(); throw e; }
/* =========================================================================
1. QUALITY PRESETS
========================================================================= */
const QUALITY = {
low: { pixelRatio: 1.0, shadow: 1024, trees: 340, palms: 70, bushes: 260, ferns: 320, grass: 700, rocks: 180, far: 420, particles: 180, terrainSeg: 180, shadowsOn: true },
medium: { pixelRatio: 1.4, shadow: 2048, trees: 620, palms: 130, bushes: 480, ferns: 640, grass: 1500, rocks: 300, far: 560, particles: 300, terrainSeg: 260, shadowsOn: true },
high: { pixelRatio: 2.0, shadow: 4096, trees: 900, palms: 190, bushes: 720, ferns: 980, grass: 2200, rocks: 420, far: 750, particles: 420, terrainSeg: 320, shadowsOn: true }
};
let Q = QUALITY.high;
/* =========================================================================
2. MATH / NOISE UTILITIES
========================================================================= */
const clamp = (v, a, b) => v < a ? a : (v > b ? b : v);
const lerp = (a, b, t) => a + (b - a) * t;
const smooth = t => t * t * (3 - 2 * t);
const damp = (a, b, l, dt) => lerp(a, b, 1 - Math.exp(-l * dt));
const TAU = Math.PI * 2;
function hash2(i, j) {
let n = (i * 374761393 + j * 668265263) | 0;
n = (n ^ (n >> 13)) | 0;
n = (n * 1274126177) | 0;
return ((n ^ (n >> 16)) >>> 0) / 4294967295;
}
function valueNoise(x, z) {
const xi = Math.floor(x), zi = Math.floor(z);
const xf = x - xi, zf = z - zi;
const u = smooth(xf), v = smooth(zf);
const a = hash2(xi, zi), b = hash2(xi + 1, zi), c = hash2(xi, zi + 1), d = hash2(xi + 1, zi + 1);
return lerp(lerp(a, b, u), lerp(c, d, u), v) * 2 - 1;
}
function fbm(x, z, oct = 4, freq = 1, amp = 1) {
let s = 0, a = amp, f = freq, norm = 0;
for (let i = 0; i < oct; i++) { s += valueNoise(x * f, z * f) * a; norm += a; a *= 0.5; f *= 2.03; }
return s / (norm || 1);
}
// deterministic pseudo random stream
function mulberry(seed) {
let t = seed >>> 0;
return function () { t += 0x6D2B79F5; let r = Math.imul(t ^ (t >>> 15), 1 | t); r ^= r + Math.imul(r ^ (r >>> 7), 61 | r); return ((r ^ (r >>> 14)) >>> 0) / 4294967296; };
}
/* =========================================================================
3. TRAIL (CLOSED LOOP SPLINE) + TERRAIN HEIGHTFIELD
========================================================================= */
const WORLD = 900; // terrain plane size
const BOUND = 400; // playable radius
const ROAD_HALF = 4.3; // driveable half width
const ROAD_BLEND = 9.0; // shoulder blend
// Hand-placed control points: irregular closed circuit with switchbacks,
// a narrow section, a wide clearing, a rocky climb, a river dip and a bridge.
const CTRL = [
[0, -250, 1.0],
[88, -238, 2.4],
[158, -186, 5.8],
[196, -104, 10.5], // climb toward rocky hill
[236, -34, 16.0],
[214, 40, 13.0],
[150, 72, 7.5],
[112, 132, 4.0],
[158, 196, 3.0],
[96, 246, 2.0],
[6, 254, 1.2], // wide scenic clearing
[-78, 222, 1.4],
[-142, 160, 2.6], // river / stream crossing near here
[-126, 84, 1.0],
[-192, 34, 4.5],
[-236, -42, 8.5], // switchback
[-176, -96, 11.5],
[-206, -166, 6.5],
[-142, -214, 3.0],
[-66, -250, 1.6]
];
const curvePts = CTRL.map(p => new THREE.Vector3(p[0], p[2], p[1]));
const trail = new THREE.CatmullRomCurve3(curvePts, true, 'catmullrom', 0.5);
const TRAIL_LEN = trail.getLength();
const SAMPLES = 1400;
const trailPts = trail.getSpacedPoints(SAMPLES); // SAMPLES+1 pts, last == first
const trailTan = [];
for (let i = 0; i <= SAMPLES; i++) {
const a = trailPts[i], b = trailPts[(i + 1) % SAMPLES];
trailTan.push(new THREE.Vector3(b.x - a.x, 0, b.z - a.z).normalize());
}
// spatial hash for nearest-trail-point queries
const CELL = 26, grid = new Map();
function key(cx, cz) { return cx * 4096 + cz; }
for (let i = 0; i < SAMPLES; i++) {
const p = trailPts[i];
const cx = Math.floor(p.x / CELL), cz = Math.floor(p.z / CELL);
for (let ox = -1; ox <= 1; ox++) for (let oz = -1; oz <= 1; oz++) {
const k = key(cx + ox, cz + oz);
let arr = grid.get(k); if (!arr) { arr = []; grid.set(k, arr); } arr.push(i);
}
}
const _tmpInfo = { dist: 999, y: 0, i: 0, t: 0 };
function trailInfo(x, z) {
const cx = Math.floor(x / CELL), cz = Math.floor(z / CELL);
const arr = grid.get(key(cx, cz));
let best = 1e9, bi = 0;
if (arr) {
for (let n = 0; n < arr.length; n++) {
const i = arr[n], p = trailPts[i];
const dx = p.x - x, dz = p.z - z, d = dx * dx + dz * dz;
if (d < best) { best = d; bi = i; }
}
} else {
// coarse fallback scan
for (let i = 0; i < SAMPLES; i += 7) {
const p = trailPts[i]; const dx = p.x - x, dz = p.z - z, d = dx * dx + dz * dz;
if (d < best) { best = d; bi = i; }
}
}
_tmpInfo.dist = Math.sqrt(best);
_tmpInfo.i = bi;
_tmpInfo.y = trailPts[bi].y;
_tmpInfo.t = bi / SAMPLES;
return _tmpInfo;
}
// Special zones along the loop
const STREAM = { c: new THREE.Vector3(-142, 0, 160), r: 26, level: 0.0 }; // filled after height calc
const BRIDGE = { i: Math.floor(SAMPLES * 0.63), len: 22 };
let bridgeCenter = new THREE.Vector3(), bridgeDir = new THREE.Vector3();
function roadDamage(x, z, t, dist) {
// ruts (two parallel grooves), potholes, small bumps — only on the trail
let d = 0;
const across = dist;
const rut = Math.exp(-Math.pow((across - 1.55) / 0.75, 2)) * 0.5 + Math.exp(-Math.pow((across - 0.15) / 0.6, 2)) * 0.12;
d -= rut * (0.34 + 0.26 * Math.sin(t * TAU * 17.0));
d += fbm(x * 0.12, z * 0.12, 3) * 0.30; // general roughness
d += fbm(x * 0.42, z * 0.42, 2) * 0.11; // fine chatter
// occasional potholes
const ph = fbm(x * 0.055 + 41, z * 0.055 - 17, 2);
if (ph > 0.42) d -= (ph - 0.42) * 1.5;
// rocky hill section gets harsher
const rocky = clamp((t - 0.16) / 0.06, 0, 1) * clamp((0.30 - t) / 0.06, 0, 1);
d += fbm(x * 0.30, z * 0.30, 3) * 0.42 * rocky;
return d;
}
function baseTerrain(x, z) {
let h = fbm(x * 0.0042, z * 0.0042, 4) * 26.0; // large hills
h += fbm(x * 0.016, z * 0.016, 4) * 6.2; // medium
h += fbm(x * 0.07, z * 0.07, 3) * 1.1; // detail
// ring ridge to hide boundaries
const r = Math.hypot(x, z);
h += Math.max(0, (r - 300) / 100) * 46;
return h;
}
function terrainHeight(x, z) {
const info = trailInfo(x, z);
const base = baseTerrain(x, z);
let h;
if (info.dist < ROAD_HALF) {
h = info.y + roadDamage(x, z, info.t, info.dist);
} else if (info.dist < ROAD_HALF + ROAD_BLEND) {
const k = smooth((info.dist - ROAD_HALF) / ROAD_BLEND);
const road = info.y + roadDamage(x, z, info.t, ROAD_HALF) * 0.6;
h = lerp(road, Math.max(base, info.y - 2.4), k);
} else {
h = base;
}
// stream carve
const sd = Math.hypot(x - STREAM.c.x, z - STREAM.c.z);
if (sd < STREAM.r) {
const k = smooth(1 - sd / STREAM.r);
h -= k * 1.35;
}
return isFinite(h) ? h : 0;
}
function surfaceAt(x, z) {
const info = trailInfo(x, z);
const sd = Math.hypot(x - STREAM.c.x, z - STREAM.c.z);
if (sd < STREAM.r * 0.55) return 'water';
if (info.dist > ROAD_HALF + 2.5) return 'grass';
const rocky = (info.t > 0.16 && info.t < 0.30);
if (rocky) return 'rock';
const wet = fbm(x * 0.03 + 7, z * 0.03 - 3, 2);
if (wet > 0.12 || sd < STREAM.r) return 'mud';
return 'dirt';
}
STREAM.level = terrainHeight(STREAM.c.x, STREAM.c.z) + 0.62;
/* =========================================================================
4. RENDERER / SCENE / LIGHTS
========================================================================= */
let renderer, scene, sunLight, hemi, sky;
let composer = null, bloomPass = null;
// warm painterly colour grade (Ghibli-style)
const GradeShader = {
uniforms: { tDiffuse: { value: null } },
vertexShader: `varying vec2 vUv; void main(){ vUv=uv; gl_Position=projectionMatrix*modelViewMatrix*vec4(position,1.0); }`,
fragmentShader: `
uniform sampler2D tDiffuse; varying vec2 vUv;
void main(){
vec4 c = texture2D(tDiffuse, vUv);