Substrate/tower_visualization.html at master · bill-call/Substrate · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Substrate: Tower Morphology — Architectural View</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
body{overflow:hidden;background:#0a0a16;font-family:'Courier New',monospace;color:#aab}
canvas{display:block}
#info{position:absolute;top:8px;left:8px;font-size:11px;line-height:1.5;max-width:310px;
  background:rgba(10,10,22,0.88);padding:8px 10px;border:1px solid #334;pointer-events:none}
#info h2{color:#dde;font-size:13px;margin-bottom:3px}
.d{color:#667;font-size:10px}
#views{position:absolute;top:8px;right:8px}
#views button{display:block;margin:2px 0;padding:3px 7px;background:#161628;
  color:#99a;border:1px solid #334;cursor:pointer;font-family:inherit;font-size:10px;
  min-width:110px;text-align:left}
#views button:hover{background:#222240;color:#dde}
#plan{position:absolute;bottom:8px;right:8px;border:1px solid #334;background:rgba(10,10,22,0.88)}
#planLbl{position:absolute;bottom:198px;right:8px;font-size:9px;color:#445;
  text-align:center;width:240px;pointer-events:none}
#note{position:absolute;bottom:8px;left:8px;font-size:9px;color:#334}
</style>
</head>
<body>

<div id="info">
<h2>Mature Terminator Tower (~1 km)</h2>
"Gothic cathedral buttress &mdash;<br>
wide base sweeping up to a thin ridge."<br><br>
<span class="d">
White ribs: structural vault arches<br>
Gold lines: windward face meridians<br>
Cyan: root buttress flare zone<br>
Amber: windward intake face<br>
Green: living zone shell (2-3 m)<br>
Gray: structural lattice / chimney<br>
Blue: trailing edge + chimney vents<br><br>
Base (ground): ~68 m deep &times; ~250 m wide<br>
At 100 m: ~44 m deep &times; ~175 m wide<br>
At 500 m: ~13 m deep &times; ~69 m wide<br>
Apex ridge: ~4 m &times; ~25 m<br>
Height: 1,000 m<br><br>
Drag to rotate &middot; Scroll to zoom
</span>
</div>

<div id="views">
<button onclick="setView('persp')">Perspective</button>
<button onclick="setView('plan')">Plan (top)</button>
<button onclick="setView('side')">Side Profile</button>
<button onclick="setView('front')">Windward Face</button>
<button onclick="setView('rear')">Trailing Edge</button>
<button onclick="setView('base')">Base / Buttresses</button>
<button onclick="setView('growth')" style="margin-top:8px;border-color:#5a7">Growth Stages</button>
<button onclick="setView('region')" style="margin-top:2px;border-color:#a75">Regional Variation</button>
</div>

<div id="planLbl">Plan cross-section at 500 m</div>
<canvas id="plan" width="240" height="180"></canvas>
<div id="note">Grid = 100 m | Wireframe = lattice character | True proportions</div>

<script type="importmap">
{"imports":{
  "three":"https://cdn.jsdelivr.net/npm/three@0.160.0/build/three.module.js",
  "three/addons/":"https://cdn.jsdelivr.net/npm/three@0.160.0/examples/jsm/"
}}
</script>

<script type="module">
import * as THREE from 'three';
import {OrbitControls} from 'three/addons/controls/OrbitControls.js';

// ============================================================
// PARAMETERS
// ============================================================
const H = 1000;

function nacaHW(x) {
  x = Math.max(1e-4, Math.min(.9999, x));
  const v = .2969*Math.sqrt(x) - .126*x - .3516*x*x + .2843*x*x*x - .1036*x*x*x*x;
  return Math.max(0, v / .10042);
}

// Blend airfoil → circle for shape maturity (proto-mound = circular, mature = full airfoil)
function profileHW(xn, blend) {
  const naca = nacaHW(xn);
  const circ = 2 * Math.sqrt(Math.max(0, xn * (1 - xn)));
  return blend * naca + (1 - blend) * circ;
}

// Note: the "gentle central peak" (morphology hub §5.8) is a sub-visual-scale
// feature (~5-10m on a 1000m tower, <1%). Not modeled here — it creates saddle
// artifacts on the airfoil cross-section that are more misleading than informative.
// All cross-sections are at uniform height.

function chordAt(z) {
  const t = Math.min(z / H, 1);
  // Base taper already widens toward ground (power 1.8).
  // Buttress flare: broad, smooth additional widening over bottom 150m.
  // Blends seamlessly — no kink. "Almost a mound" at ground level.
  let d = 4 + 46 * Math.pow(1 - t, 1.8);
  if (z < 150) d *= 1 + .35 * Math.pow(1 - z / 150, 1.5);
  return d;
}

function spanAt(z) {
  const t = Math.min(z / H, 1);
  let w = 25 + 175 * Math.pow(1 - t, 1.5);
  if (z < 150) w *= 1 + .25 * Math.pow(1 - z / 150, 1.5);
  return w;
}

// ============================================================
// MAIN TOWER MESH
// ============================================================
function buildTower() {
  const NZ = 80, NP = 100, pos = [], col = [], idx = [];
  for (let i = 0; i <= NZ; i++) {
    const zB = (i / NZ) * H;
    for (let j = 0; j < NP; j++) {
      const th = 2 * Math.PI * j / NP;
      const xn = (1 - Math.cos(th)) / 2;
      const sign = th <= Math.PI ? 1 : -1;
      const ny = nacaHW(xn);
      const D = chordAt(zB);
      const W = spanAt(zB);
      pos.push(xn * D, zB, sign * ny * W / 2);
      // Color by zone
      const hf = .3 + .7 * Math.min(zB / H, 1);
      let r, g, b;
      if (xn < .06)      { r=.8;  g=.58; b=.25; }  // windward (amber)
      else if (xn < .25) { r=.28; g=.56; b=.3;  }  // living zone (green)
      else if (xn < .7)  { r=.36; g=.36; b=.4;  }  // structural (gray)
      else               { r=.22; g=.3;  b=.5;  }  // trailing edge (blue)
      // Tint buttress zone cyan
      if (zB < 150) {
        const f = (1 - zB / 150) * .2;
        r = r * (1-f) + .2*f; g = g * (1-f) + .6*f; b = b * (1-f) + .6*f;
      }
      col.push(r * hf, g * hf, b * hf);
    }
  }
  for (let i = 0; i < NZ; i++)
    for (let j = 0; j < NP; j++) {
      const a = i*NP+j, b = i*NP+(j+1)%NP, c = (i+1)*NP+j, d = (i+1)*NP+(j+1)%NP;
      idx.push(a, c, b, b, c, d);
    }
  const geo = new THREE.BufferGeometry();
  geo.setAttribute('position', new THREE.Float32BufferAttribute(pos, 3));
  geo.setAttribute('color', new THREE.Float32BufferAttribute(col, 3));
  geo.setIndex(idx); geo.computeVertexNormals();
  return geo;
}

// ============================================================
// HORIZONTAL ARCH RIBS (cross-sections showing the vault)
// ============================================================
function buildHRibs() {
  const grp = new THREE.Group();
  const mat = new THREE.LineBasicMaterial({color: 0xffffff, transparent: true, opacity: .45});
  for (const z of [0, 30, 80, 200, 400, 600, 800, 1000]) {
    const pts = [], D = chordAt(z), W = spanAt(z);
    for (let j = 0; j <= 120; j++) {
      const th = 2 * Math.PI * j / 120;
      const xn = (1 - Math.cos(th)) / 2;
      const sign = th <= Math.PI ? 1 : -1;
      pts.push(new THREE.Vector3(xn * D, z, sign * nacaHW(xn) * W / 2));
    }
    grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), mat));
  }
  return grp;
}

// ============================================================
// VERTICAL MERIDIANS on windward face (shows vault curvature)
// ============================================================
function buildVRibs() {
  const grp = new THREE.Group();
  const mat = new THREE.LineBasicMaterial({color: 0xccaa55, transparent: true, opacity: .3});
  for (const cf of [0, .15, .3, .5, .7, .85, .95]) {
    for (const side of [1, -1]) {
      if (cf === 0 && side === -1) continue;
      const pts = [];
      for (let i = 0; i <= 60; i++) {
        const z = (i / 60) * H;
        const D = chordAt(z), W = spanAt(z);
        const xOff = D * .02 * cf * cf;
        pts.push(new THREE.Vector3(xOff, z, side * cf * W / 2));
      }
      grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), mat));
    }
  }
  return grp;
}

// ============================================================
// ROOT / BUTTRESS RIDGE LINES
// ============================================================
function buildRoots() {
  const grp = new THREE.Group();
  const mat = new THREE.LineBasicMaterial({color: 0x55aaaa, transparent: true, opacity: .45});
  const N = 16;
  for (let k = 0; k < N; k++) {
    const th = 2 * Math.PI * k / N;
    const xn = (1 - Math.cos(th)) / 2;
    const sign = th <= Math.PI ? 1 : -1;
    const ny = nacaHW(xn);
    if (ny < .03 && xn > .05 && xn < .95) continue;
    const pts = [];
    // Trace the buttress flare zone (0 to 150m) — on the tower surface
    for (let i = 0; i <= 30; i++) {
      const z = 150 * (1 - i / 30);
      const D = chordAt(z), W = spanAt(z);
      pts.push(new THREE.Vector3(xn * D, z, sign * ny * W / 2));
    }
    grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), mat));
  }
  return grp;
}

// ============================================================
// INTERIOR CHIMNEY CHANNELS (faint vertical lines)
// ============================================================
function buildChimney() {
  const grp = new THREE.Group();
  const mat = new THREE.LineBasicMaterial({color: 0x4466aa, transparent: true, opacity: .15});
  for (const xf of [.35, .5, .65, .8]) {
    for (const wf of [0, .25, -.25]) {
      const pts = [];
      for (let i = 0; i <= 40; i++) {
        const z = (i / 40) * H;
        const D = chordAt(z), W = spanAt(z);
        pts.push(new THREE.Vector3(xf * D, z, wf * W * .25));
      }
      grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), mat));
    }
  }
  return grp;
}

// ============================================================
// TRAILING-EDGE VENT MARKS (upper tower)
// ============================================================
function buildVents() {
  const grp = new THREE.Group();
  const mat = new THREE.LineBasicMaterial({color: 0x6688cc, transparent: true, opacity: .45});
  for (let z = 350; z <= 950; z += 60) {
    const D = chordAt(z), W = spanAt(z);
    // V-shaped vent marks at trailing edge
    for (const side of [1, -1]) {
      const pts = [
        new THREE.Vector3(D * .92, z, side * W * .04),
        new THREE.Vector3(D, z, 0),
        new THREE.Vector3(D * .92, z, -side * W * .04)
      ];
      grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), mat));
    }
  }
  return grp;
}

// ============================================================
// GROWTH STAGE TOWER BUILDER (parameterized)
// ============================================================
function buildStageTower(cfg, zOffset) {
  const NZ = 50, NP = 60, pos = [], col = [], idx = [];
  const {h, bc, bs, tc, ts, blend, flareZ, flareD, flareW} = cfg;
  const chFn = z => {
    const t = Math.min(z / h, 1);
    let d = tc + (bc - tc) * Math.pow(1 - t, 1.8);
    if (z < flareZ && flareZ > 0) d *= 1 + flareD * Math.pow(1 - z / flareZ, 1.5);
    return d;
  };
  const spFn = z => {
    const t = Math.min(z / h, 1);
    let w = ts + (bs - ts) * Math.pow(1 - t, 1.5);
    if (z < flareZ && flareZ > 0) w *= 1 + flareW * Math.pow(1 - z / flareZ, 1.5);
    return w;
  };
  for (let i = 0; i <= NZ; i++) {
    const zB = (i / NZ) * h;
    for (let j = 0; j < NP; j++) {
      const th = 2 * Math.PI * j / NP;
      const xn = (1 - Math.cos(th)) / 2;
      const sign = th <= Math.PI ? 1 : -1;
      const ny = profileHW(xn, blend);
      const D = chFn(zB), W = spFn(zB);
      pos.push(xn * D, zB, sign * ny * W / 2 + zOffset);
      const hf = .3 + .7 * Math.min(zB / h, 1);
      let r, g, b;
      if (xn < .06)      { r=.8; g=.58; b=.25; }
      else if (xn < .25) { r=.28; g=.56; b=.3; }
      else if (xn < .7)  { r=.36; g=.36; b=.4; }
      else               { r=.22; g=.3; b=.5; }
      col.push(r * hf, g * hf, b * hf);
    }
  }
  for (let i = 0; i < NZ; i++)
    for (let j = 0; j < NP; j++) {
      const a = i*NP+j, b = i*NP+(j+1)%NP, c = (i+1)*NP+j, d = (i+1)*NP+(j+1)%NP;
      idx.push(a, c, b, b, c, d);
    }
  const geo = new THREE.BufferGeometry();
  geo.setAttribute('position', new THREE.Float32BufferAttribute(pos, 3));
  geo.setAttribute('color', new THREE.Float32BufferAttribute(col, 3));
  geo.setIndex(idx); geo.computeVertexNormals();
  return geo;
}

// ============================================================
// GROWTH STAGES (5 towers showing progression)
// ============================================================
function buildGrowthStages() {
  const grp = new THREE.Group();
  const stages = [
    // Proto-mound: pre-symbiote, crude mineral accretion, nearly circular
    { label:'Proto-mound\n~50 m\nPre-symbiote',
      h:50, bc:8, bs:12, tc:3, ts:8, blend:.15, flareZ:0, flareD:0, flareW:0 },
    // Young: early Healers, developing airfoil, modest base
    { label:'Young tower\n~200 m\nEarly Healers',
      h:200, bc:14, bs:40, tc:4, ts:15, blend:.5, flareZ:30, flareD:.12, flareW:.08 },
    // Adolescent: clear airfoil, active base renovation underway
    { label:'Adolescent\n~500 m\nActive renovation',
      h:500, bc:22, bs:80, tc:4, ts:20, blend:.85, flareZ:70, flareD:.22, flareW:.15 },
    // Sub-mature: near-optimal, most renovation complete
    { label:'Sub-mature\n~750 m\nNear-optimal',
      h:750, bc:32, bs:130, tc:4, ts:22, blend:.95, flareZ:110, flareD:.3, flareW:.2 },
    // Mature: fully renovated equilibrium form
    { label:'Mature\n~1000 m\nFully renovated',
      h:1000, bc:50, bs:200, tc:4, ts:25, blend:1, flareZ:150, flareD:.35, flareW:.25 },
  ];
  let zOff = 0;
  for (const cfg of stages) {
    const geo = buildStageTower(cfg, zOff);
    grp.add(new THREE.Mesh(geo, new THREE.MeshPhongMaterial({
      vertexColors: true, side: THREE.DoubleSide,
      transparent: true, opacity: .45, shininess: 15, depthWrite: false
    })));
    grp.add(new THREE.LineSegments(
      new THREE.WireframeGeometry(geo),
      new THREE.LineBasicMaterial({color: 0x556677, transparent: true, opacity: .1})
    ));
    // Cross-section rings at 25% intervals
    const ringMat = new THREE.LineBasicMaterial({color: 0xffffff, transparent: true, opacity: .35});
    for (let r = 0; r <= 4; r++) {
      const z = (r / 4) * cfg.h, pts = [];
      const t = Math.min(z / cfg.h, 1);
      let D = cfg.tc + (cfg.bc - cfg.tc) * Math.pow(1 - t, 1.8);
      if (z < cfg.flareZ && cfg.flareZ > 0) D *= 1 + cfg.flareD * Math.pow(1 - z / cfg.flareZ, 1.5);
      let W = cfg.ts + (cfg.bs - cfg.ts) * Math.pow(1 - t, 1.5);
      if (z < cfg.flareZ && cfg.flareZ > 0) W *= 1 + cfg.flareW * Math.pow(1 - z / cfg.flareZ, 1.5);
      for (let j = 0; j <= 80; j++) {
        const th = 2 * Math.PI * j / 80;
        const xn = (1 - Math.cos(th)) / 2, sign = th <= Math.PI ? 1 : -1;
        pts.push(new THREE.Vector3(xn * D, z, sign * profileHW(xn, cfg.blend) * W / 2 + zOff));
      }
      grp.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), ringMat));
    }
    // Label
    const c = document.createElement('canvas'); c.width = 300; c.height = 120;
    const x = c.getContext('2d');
    x.fillStyle = '#aab'; x.font = '20px Courier New'; x.textAlign = 'center';
    cfg.label.split('\n').forEach((l, i) => x.fillText(l, 150, 28 + i * 26));
    const sp = new THREE.Sprite(new THREE.SpriteMaterial({map: new THREE.CanvasTexture(c), transparent: true}));
    sp.position.set(cfg.bc / 2, cfg.h + 60, zOff);
    sp.scale.set(220, 90, 1);
    grp.add(sp);
    zOff += Math.max(cfg.bs, 120) * 1.4 + 80;
  }
  grp.visible = false;
  return grp;
}

// ============================================================
// REGIONAL VARIATION GRID — age × region matrix (§8.4)
// ============================================================
function buildRegionalVariation() {
  const grp = new THREE.Group();

  // Columns: environmental zones (§8.4 shape continuum)
  // Mature tower parameters for each region
  const regions = [
    { name:'Terminator',  sub:'\u03B8=90\u00B0 | 9.5 m/s',  mH:1000, mBC:50, mBS:200, mTC:4, mTS:25, mBlend:1,   mFlareZ:150, mFlareD:.35, mFlareW:.25 },
    { name:'Near Dark',   sub:'\u03B8\u2248110\u00B0 | ~7 m/s',  mH:600,  mBC:30, mBS:120, mTC:5, mTS:20, mBlend:.8,  mFlareZ:80,  mFlareD:.25, mFlareW:.18 },
    { name:'Mid Dark',    sub:'\u03B8\u2248135\u00B0 | ~4 m/s',  mH:300,  mBC:20, mBS:50,  mTC:6, mTS:15, mBlend:.45, mFlareZ:35,  mFlareD:.15, mFlareW:.1 },
    { name:'Deep Dark',   sub:'\u03B8\u2248160\u00B0 | ~1.5 m/s',mH:100,  mBC:12, mBS:18,  mTC:6, mTS:10, mBlend:.15, mFlareZ:0,   mFlareD:0,   mFlareW:0 },
    { name:'Anti-stellar', sub:'\u03B8\u2192180\u00B0 | ~0 m/s', mH:40,   mBC:10, mBS:10,  mTC:5, mTS:6,  mBlend:0,   mFlareZ:0,   mFlareD:0,   mFlareW:0 },
  ];

  // Rows: growth stages (frac=0 → proto-mound, frac=1 → mature)
  const stages = [
    { name:'Proto-mound',  frac:0 },
    { name:'Young',        frac:.2 },
    { name:'Adolescent',   frac:.5 },
    { name:'Mature',       frac:1 },
  ];

  // Derive tower config for any (region, stage) cell.
  // Proto-mound: nearly circular, proportional to height.
  // Mature: full regional parameters.
  // Intermediate: linear interpolation from proto baseline to mature.
  function cellCfg(reg, frac) {
    const protoH = Math.max(10, reg.mH * .05);
    const h = Math.max(10, reg.mH * (.05 + .95 * frac));
    const pB = Math.max(5, protoH * .2);
    const pBC = pB, pBS = pB * 1.3, pTC = Math.max(2, pB * .5), pTS = Math.max(3, pB * .8);
    const f = frac;
    return {
      h,
      bc: pBC + (reg.mBC - pBC) * f,
      bs: pBS + (reg.mBS - pBS) * f,
      tc: pTC + (reg.mTC - pTC) * f,
      ts: pTS + (reg.mTS - pTS) * f,
      blend: reg.mBlend * (.15 + .85 * f),
      flareZ: reg.mFlareZ * Math.max(0, (f - .3) / .7),
      flareD: reg.mFlareD * Math.max(0, (f - .3) / .7),
      flareW: reg.mFlareW * Math.max(0, (f - .3) / .7),
    };
  }

  // Grid: stages along Z (left→right), regions along X (front→back)
  const colSpace = 450;   // Z spacing between age columns
  const rowSpace = 500;   // X spacing between region rows

  for (let ri = 0; ri < regions.length; ri++) {
    for (let si = 0; si < stages.length; si++) {
      const cfg = cellCfg(regions[ri], stages[si].frac);
      const sub = new THREE.Group();

      const geo = buildStageTower(cfg, 0);
      sub.add(new THREE.Mesh(geo, new THREE.MeshPhongMaterial({
        vertexColors: true, side: THREE.DoubleSide,
        transparent: true, opacity: .45, shininess: 15, depthWrite: false
      })));
      sub.add(new THREE.LineSegments(
        new THREE.WireframeGeometry(geo),
        new THREE.LineBasicMaterial({color: 0x556677, transparent: true, opacity: .1})
      ));

      // Cross-section rings
      const ringMat = new THREE.LineBasicMaterial({color: 0xffffff, transparent: true, opacity: .3});
      const nR = Math.max(1, Math.min(4, Math.ceil(cfg.h / 250)));
      for (let r = 0; r <= nR; r++) {
        const z = (r / nR) * cfg.h, pts = [];
        const t = Math.min(z / cfg.h, 1);
        let D = cfg.tc + (cfg.bc - cfg.tc) * Math.pow(1 - t, 1.8);
        if (z < cfg.flareZ && cfg.flareZ > 0) D *= 1 + cfg.flareD * Math.pow(1 - z / cfg.flareZ, 1.5);
        let W = cfg.ts + (cfg.bs - cfg.ts) * Math.pow(1 - t, 1.5);
        if (z < cfg.flareZ && cfg.flareZ > 0) W *= 1 + cfg.flareW * Math.pow(1 - z / cfg.flareZ, 1.5);
        for (let j = 0; j <= 60; j++) {
          const th = 2 * Math.PI * j / 60;
          const xn = (1 - Math.cos(th)) / 2, sign = th <= Math.PI ? 1 : -1;
          pts.push(new THREE.Vector3(xn * D, z, sign * profileHW(xn, cfg.blend) * W / 2));
        }
        sub.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints(pts), ringMat));
      }

      // Per-cell height label
      const c = document.createElement('canvas'); c.width = 128; c.height = 40;
      const x = c.getContext('2d');
      x.fillStyle = '#667'; x.font = '16px Courier New'; x.textAlign = 'center';
      x.fillText(Math.round(cfg.h) + 'm', 64, 26);
      const sp = new THREE.Sprite(new THREE.SpriteMaterial({map: new THREE.CanvasTexture(c), transparent: true}));
      sp.position.set(cfg.bc / 2, cfg.h + 25, 0);
      sp.scale.set(70, 24, 1);
      sub.add(sp);

      sub.position.set(ri * rowSpace, 0, si * colSpace);
      grp.add(sub);
    }
  }

  // Column headers (stage names) — along Z axis at front of grid (x = -100)
  for (let si = 0; si < stages.length; si++) {
    const c = document.createElement('canvas'); c.width = 256; c.height = 48;
    const x = c.getContext('2d');
    x.fillStyle = '#aab'; x.font = 'bold 20px Courier New'; x.textAlign = 'center';
    x.fillText(stages[si].name, 128, 32);
    const sp = new THREE.Sprite(new THREE.SpriteMaterial({map: new THREE.CanvasTexture(c), transparent: true}));
    sp.position.set(-120, 5, si * colSpace);
    sp.scale.set(200, 40, 1);
    grp.add(sp);
  }

  // Row headers (region names + wind) — along X axis at left of grid (z = -120)
  for (let ri = 0; ri < regions.length; ri++) {
    const c = document.createElement('canvas'); c.width = 380; c.height = 64;
    const x = c.getContext('2d');
    x.fillStyle = '#dde'; x.font = 'bold 18px Courier New'; x.textAlign = 'center';
    x.fillText(regions[ri].name, 190, 24);
    x.fillStyle = '#889'; x.font = '14px Courier New';
    x.fillText(regions[ri].sub, 190, 46);
    const sp = new THREE.Sprite(new THREE.SpriteMaterial({map: new THREE.CanvasTexture(c), transparent: true}));
    sp.position.set(ri * rowSpace, 5, -180);
    sp.scale.set(300, 50, 1);
    grp.add(sp);
  }

  grp.visible = false;
  return grp;
}

// ============================================================
// SCENE
// ============================================================
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x0a0a16);
scene.fog = new THREE.Fog(0x0a0a16, 4000, 8000);

const camera = new THREE.PerspectiveCamera(45, innerWidth / innerHeight, 1, 10000);
camera.position.set(-500, 600, 600);

const renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize(innerWidth, innerHeight);
renderer.setPixelRatio(Math.min(devicePixelRatio, 2));
document.body.appendChild(renderer.domElement);

const controls = new OrbitControls(camera, renderer.domElement);
controls.target.set(20, 400, 0);
controls.enableDamping = true;
controls.dampingFactor = .08;
controls.update();

// Lights
scene.add(new THREE.AmbientLight(0x334455, .5));
const dl1 = new THREE.DirectionalLight(0xffeedd, .7);
dl1.position.set(-300, 800, 400); scene.add(dl1);
const dl2 = new THREE.DirectionalLight(0x445566, .25);
dl2.position.set(200, 200, -300); scene.add(dl2);

// Main tower group (toggled off when showing growth stages)
const mainGroup = new THREE.Group();
const tGeo = buildTower();
mainGroup.add(new THREE.Mesh(tGeo, new THREE.MeshPhongMaterial({
  vertexColors: true, side: THREE.DoubleSide,
  transparent: true, opacity: .4, shininess: 15, depthWrite: false
})));
mainGroup.add(new THREE.LineSegments(
  new THREE.WireframeGeometry(tGeo),
  new THREE.LineBasicMaterial({color: 0x556677, transparent: true, opacity: .08})
));
mainGroup.add(buildHRibs());
mainGroup.add(buildVRibs());
mainGroup.add(buildRoots());
mainGroup.add(buildChimney());
mainGroup.add(buildVents());
scene.add(mainGroup);

// Growth stages group (toggled on via button)
const growthGroup = buildGrowthStages();
scene.add(growthGroup);

// Regional variation grid (toggled on via button)
const regionGroup = buildRegionalVariation();
scene.add(regionGroup);

// Ground grid
const grid = new THREE.GridHelper(2000, 20, 0x1a1a33, 0x111122);
grid.material.transparent = true; grid.material.opacity = .35;
scene.add(grid);

// Wind arrow
{
  const g = new THREE.Group(), m = new THREE.MeshBasicMaterial({color: 0xcc4444});
  const s = new THREE.Mesh(new THREE.CylinderGeometry(2, 2, 180, 6), m);
  s.rotation.z = -Math.PI / 2; s.position.set(-200, 5, -140); g.add(s);
  const h = new THREE.Mesh(new THREE.ConeGeometry(6, 25, 6), m);
  h.rotation.z = -Math.PI / 2; h.position.set(-85, 5, -140); g.add(h);
  const c = document.createElement('canvas'); c.width = 256; c.height = 48;
  const x = c.getContext('2d'); x.fillStyle = '#cc4444'; x.font = '24px Courier New';
  x.fillText('WIND 9.5 m/s', 10, 32);
  const sp = new THREE.Sprite(new THREE.SpriteMaterial({
    map: new THREE.CanvasTexture(c), transparent: true}));
  sp.position.set(-150, 5, -170); sp.scale.set(160, 40, 1); g.add(sp);
  scene.add(g);
}

// Scale bar
{
  const g = new THREE.Group();
  const m = new THREE.LineBasicMaterial({color: 0x556677});
  g.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints([
    new THREE.Vector3(-90, 0, -100), new THREE.Vector3(-90, 1000, -100)]), m));
  for (let y = 0; y <= 1000; y += 200) {
    g.add(new THREE.Line(new THREE.BufferGeometry().setFromPoints([
      new THREE.Vector3(-95, y, -100), new THREE.Vector3(-85, y, -100)]), m));
    const c = document.createElement('canvas'); c.width = 96; c.height = 36;
    const x = c.getContext('2d'); x.fillStyle = '#556677'; x.font = '20px Courier New';
    x.textAlign = 'right'; x.fillText(y + 'm', 88, 24);
    const sp = new THREE.Sprite(new THREE.SpriteMaterial({
      map: new THREE.CanvasTexture(c), transparent: true}));
    sp.position.set(-115, y, -100); sp.scale.set(50, 20, 1); g.add(sp);
  }
  scene.add(g);
}

// ============================================================
// CAMERA PRESETS
// ============================================================
let activeView = 'main'; // 'main' | 'growth' | 'region'
function showOnly(which) {
  mainGroup.visible = which === 'main';
  growthGroup.visible = which === 'growth';
  regionGroup.visible = which === 'region';
  activeView = which;
}
window.setView = function(name) {
  let pos, tgt;
  if (name === 'growth') {
    const target = activeView === 'growth' ? 'main' : 'growth';
    showOnly(target);
    if (target === 'growth') {
      pos = new THREE.Vector3(-600, 700, 400);
      tgt = new THREE.Vector3(20, 300, 350);
    } else {
      pos = new THREE.Vector3(-500, 600, 600);
      tgt = new THREE.Vector3(20, 400, 0);
    }
  } else if (name === 'region') {
    const target = activeView === 'region' ? 'main' : 'region';
    showOnly(target);
    if (target === 'region') {
      pos = new THREE.Vector3(-800, 1200, -400);
      tgt = new THREE.Vector3(900, 150, 700);
    } else {
      pos = new THREE.Vector3(-500, 600, 600);
      tgt = new THREE.Vector3(20, 400, 0);
    }
  } else {
    showOnly('main');
    switch (name) {
      case 'persp': pos = new THREE.Vector3(-500,600,600);  tgt = new THREE.Vector3(20,400,0); break;
      case 'plan':  pos = new THREE.Vector3(25,2200,0);     tgt = new THREE.Vector3(25,0,0); break;
      case 'side':  pos = new THREE.Vector3(25,500,1200);   tgt = new THREE.Vector3(25,500,0); break;
      case 'front': pos = new THREE.Vector3(-1200,500,0);   tgt = new THREE.Vector3(0,500,0); break;
      case 'rear':  pos = new THREE.Vector3(1200,500,0);    tgt = new THREE.Vector3(40,500,0); break;
      case 'base':  pos = new THREE.Vector3(-200,120,300);  tgt = new THREE.Vector3(30,30,0); break;
    }
  }
  const sp = camera.position.clone(), st = controls.target.clone(), t0 = performance.now();
  (function anim(t) {
    const f = Math.min((t - t0) / 600, 1);
    const e = f < .5 ? 2*f*f : 1 - Math.pow(-2*f+2, 2) / 2;
    camera.position.lerpVectors(sp, pos, e);
    controls.target.lerpVectors(st, tgt, e);
    controls.update();
    if (f < 1) requestAnimationFrame(anim);
  })(t0);
};

// ============================================================
// 2D PLAN VIEW
// ============================================================
{
  const cv = document.getElementById('plan'), ctx = cv.getContext('2d');
  const z = 500, D = chordAt(z), W = spanAt(z);
  const w = cv.width, h = cv.height, mg = 16;
  const sc = Math.min((w - 2*mg) / D, (h - 2*mg) / W);
  const ox = mg + (w - 2*mg - D*sc) / 2, cy = h / 2;
  ctx.clearRect(0, 0, w, h);

  // Airfoil fill
  ctx.beginPath();
  for (let j = 0; j <= 200; j++) {
    const th = 2*Math.PI*j/200, xn = (1 - Math.cos(th)) / 2, s = th <= Math.PI ? 1 : -1;
    const px = ox + xn*D*sc, py = cy - s*nacaHW(xn)*W/2*sc;
    j ? ctx.lineTo(px, py) : ctx.moveTo(px, py);
  }
  ctx.closePath(); ctx.fillStyle = 'rgba(50,55,65,.4)'; ctx.fill();
  ctx.strokeStyle = '#778'; ctx.lineWidth = 1; ctx.stroke();

  // Living zone highlight
  ctx.beginPath(); let started = false;
  for (let j = 0; j <= 200; j++) {
    const th = 2*Math.PI*j/200, xn = (1 - Math.cos(th)) / 2, s = th <= Math.PI ? 1 : -1;
    if (xn * D <= 3) {
      const px = ox + xn*D*sc, py = cy - s*nacaHW(xn)*W/2*sc;
      started ? ctx.lineTo(px, py) : ctx.moveTo(px, py); started = true;
    }
  }
  ctx.strokeStyle = '#4a8'; ctx.lineWidth = 2.5; ctx.stroke();

  // Dimension lines
  ctx.strokeStyle = '#445'; ctx.lineWidth = .5; ctx.setLineDash([3, 3]);
  ctx.beginPath(); ctx.moveTo(ox, cy + W/2*sc + 10); ctx.lineTo(ox + D*sc, cy + W/2*sc + 10); ctx.stroke();
  ctx.beginPath(); ctx.moveTo(ox + D*sc + 10, cy - W/2*sc); ctx.lineTo(ox + D*sc + 10, cy + W/2*sc); ctx.stroke();
  ctx.setLineDash([]);

  // Labels
  ctx.fillStyle = '#667'; ctx.font = '9px Courier New'; ctx.textAlign = 'center';
  ctx.fillText('D=' + D.toFixed(0) + 'm', ox + D*sc/2, cy + W/2*sc + 20);
  ctx.save(); ctx.translate(ox + D*sc + 22, cy); ctx.rotate(-Math.PI / 2);
  ctx.fillText('W=' + W.toFixed(0) + 'm', 0, 0); ctx.restore();
  ctx.fillStyle = '#cc4444'; ctx.textAlign = 'left'; ctx.fillText('wind \u2192', 3, 12);
}

// ============================================================
// RESIZE + ANIMATE
// ============================================================
addEventListener('resize', () => {
  camera.aspect = innerWidth / innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(innerWidth, innerHeight);
});
(function anim() {
  requestAnimationFrame(anim);
  controls.update();
  renderer.render(scene, camera);
})();

</script>
</body>
</html>