idlegames/offroad.html at main · TimelessP/idlegames · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="theme-color" content="#ffa726">
  <meta name="application-name" content="IdleGames">
  <link rel="manifest" href="manifest.webmanifest">
  <script type="module" src="assets/js/pwa.js" defer></script>
  <title>Offroad Rally - Endless Desert</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'Arial', sans-serif;
      background: #1a0f0a;
      color: #fff;
      overflow: hidden;
      user-select: none;
    }

    #container {
      width: 100vw;
      height: 100vh;
      position: relative;
    }

    canvas {
      display: block;
      width: 100%;
      height: 100%;
    }

    #hud {
      position: absolute;
      top: 20px;
      left: 20px;
      font-size: 18px;
      font-weight: bold;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
      z-index: 10;
      pointer-events: none;
    }

    #hud div {
      margin-bottom: 8px;
    }

    #controls {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(0, 0, 0, 0.7);
      padding: 12px 24px;
      border-radius: 12px;
      font-size: 14px;
      text-align: center;
      z-index: 10;
      pointer-events: none;
    }

    #loading {
      position: absolute;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, #ff9a56, #ff6b35);
      font-size: 24px;
      font-weight: bold;
      z-index: 100;
      transition: opacity 0.5s ease;
    }

    #loading.hidden {
      opacity: 0;
      pointer-events: none;
    }
  </style>
</head>
<body>
  <div id="container">
    <div id="loading">Loading Desert Rally...</div>
    <div id="hud">
      <div>Speed: <span id="speed">0</span> km/h</div>
      <div>Distance: <span id="distance">0</span> m</div>
    </div>
    <div id="controls">
      WASD / Arrow Keys: Drive | C: Change Car Color | R: Reset Position
    </div>
  </div>

  <script type="module">
    import * as THREE from './assets/vendor/three/three.module.js';

    // ========== CONFIG ==========
    const GRAVITY = 30;
    const SPHERE_RADIUS = 0.3;
    const CAR_BODY_HEIGHT = 0.8;
    const WHEEL_RADIUS = 0.4;
    const WHEEL_WIDTH = 0.3;
    const MAX_SUSPENSION = 0.2;
    const ACCELERATION = 22;
    const MAX_SPEED = 320;
    const BRAKE_FORCE = 30;
    const STEERING_SPEED = 4.5;
    const MAX_STEER_ANGLE = 0.5;
    const DRIFT_FACTOR = 0.92;
    const TERRAIN_SIZE = 200;
    const TERRAIN_SEGMENTS = 80;
    const DUNE_HEIGHT = 8;
    const CHUNK_SIZE = 100;
    const CHUNK_SEGMENTS = 40;
    const RENDER_DISTANCE = 2;
    const CAMERA_FOLLOW_SPEED = 0.12;
    const CAMERA_LOOK_SPEED = 0.08;
    const CAMERA_OFFSET = new THREE.Vector3(0, 4, 8);

    // ========== SCENE SETUP ==========
    const scene = new THREE.Scene();
    scene.background = new THREE.Color(0xffd599);
    scene.fog = new THREE.Fog(0xffd599, 100, 250);

    const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 300);
    camera.position.set(0, 8, 12);

    const renderer = new THREE.WebGLRenderer({ antialias: true });
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.shadowMap.enabled = true;
    renderer.shadowMap.type = THREE.PCFShadowMap;
    renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
    document.getElementById('container').appendChild(renderer.domElement);

    // ========== LIGHTING ==========
    const ambientLight = new THREE.AmbientLight(0xffffff, 0.25);
    scene.add(ambientLight);

    const sunLight = new THREE.DirectionalLight(0xfff5e1, 2.0);
    sunLight.position.set(50, 60, 30);
    sunLight.castShadow = true;
    sunLight.shadow.mapSize.width = 4096;
    sunLight.shadow.mapSize.height = 4096;
    // Larger frustum for shadows so they persist as you drive
    sunLight.shadow.camera.left = -150;
    sunLight.shadow.camera.right = 150;
    sunLight.shadow.camera.top = 150;
    sunLight.shadow.camera.bottom = -150;
    sunLight.shadow.camera.near = 1;
    sunLight.shadow.camera.far = 600;
    sunLight.shadow.bias = -0.0003;
    sunLight.shadow.normalBias = 0.02;
    // Ensure light targets the car (updated per-frame)
    sunLight.target.position.set(0, 0, 0);
    scene.add(sunLight.target);
    scene.add(sunLight);

    // ========== PROCEDURAL TERRAIN ==========
    // Simplex-like noise using sine waves for procedural dunes
    function noise2D(x, z, seed = 0) {
      const scale1 = 0.05;
      const scale2 = 0.12;
      const scale3 = 0.23;

      const wave1 = Math.sin(x * scale1 + seed) * Math.cos(z * scale1 + seed);
      const wave2 = Math.sin(x * scale2 - seed * 0.7) * Math.cos(z * scale2 + seed * 0.5);
      const wave3 = Math.sin(x * scale3 + seed * 1.3) * Math.cos(z * scale3 - seed * 0.9);

      return (wave1 * 0.5 + wave2 * 0.3 + wave3 * 0.2) * DUNE_HEIGHT;
    }

    // Terrain chunk system for infinite world
    const terrainChunks = new Map();
    const terrainMaterial = new THREE.MeshStandardMaterial({
      color: 0xe8c89f,
      roughness: 0.8,
      metalness: 0.05,
      flatShading: false
    });

    function getChunkKey(chunkX, chunkZ) {
      return `${chunkX},${chunkZ}`;
    }

    function createTerrainChunk(chunkX, chunkZ) {
      const geometry = new THREE.PlaneGeometry(
        CHUNK_SIZE,
        CHUNK_SIZE,
        CHUNK_SEGMENTS,
        CHUNK_SEGMENTS
      );
      geometry.rotateX(-Math.PI / 2);

      const vertices = geometry.attributes.position.array;
      const offsetX = chunkX * CHUNK_SIZE;
      const offsetZ = chunkZ * CHUNK_SIZE;

      for (let i = 0; i < vertices.length; i += 3) {
        const x = vertices[i] + offsetX;
        const z = vertices[i + 2] + offsetZ;
        vertices[i + 1] = noise2D(x, z, 42);
      }

      geometry.computeVertexNormals();
      geometry.attributes.position.needsUpdate = true;

      const mesh = new THREE.Mesh(geometry, terrainMaterial);
      mesh.position.set(offsetX, 0, offsetZ);
      mesh.receiveShadow = true;
      scene.add(mesh);

      return mesh;
    }

    function updateTerrainChunks(centerX, centerZ) {
      const chunkX = Math.floor(centerX / CHUNK_SIZE);
      const chunkZ = Math.floor(centerZ / CHUNK_SIZE);

      const newChunks = new Set();

      // Create chunks in render distance
      for (let x = chunkX - RENDER_DISTANCE; x <= chunkX + RENDER_DISTANCE; x++) {
        for (let z = chunkZ - RENDER_DISTANCE; z <= chunkZ + RENDER_DISTANCE; z++) {
          const key = getChunkKey(x, z);
          newChunks.add(key);

          if (!terrainChunks.has(key)) {
            terrainChunks.set(key, createTerrainChunk(x, z));
          }
        }
      }

      // Remove distant chunks
      for (const [key, mesh] of terrainChunks) {
        if (!newChunks.has(key)) {
          scene.remove(mesh);
          mesh.geometry.dispose();
          terrainChunks.delete(key);
        }
      }
    }

    // Initialize starting chunks
    updateTerrainChunks(0, 0);

    // Raycaster for terrain height queries
    const raycaster = new THREE.Raycaster();
    const downVector = new THREE.Vector3(0, -1, 0);

    function getTerrainHeight(x, z) {
      raycaster.set(new THREE.Vector3(x, 100, z), downVector);
      const chunks = Array.from(terrainChunks.values());
      const intersects = raycaster.intersectObjects(chunks);
      return intersects.length > 0 ? intersects[0].point.y : 0;
    }

    // ========== PHYSICS SPHERE (INVISIBLE) ==========
    const sphereState = {
      position: new THREE.Vector3(0, 10, 0),
      velocity: new THREE.Vector3(0, 0, 0),
      onGround: false
    };

    // ========== CAR MODEL ==========
    const carGroup = new THREE.Group();
    scene.add(carGroup);

    // Car body - Tesla Cybertruck-ish angular design
    const bodyGeometry = new THREE.BoxGeometry(1.8, CAR_BODY_HEIGHT, 3.5);
    const carColors = [0xff4444, 0x44ff44, 0x4444ff, 0xffff44, 0xff44ff, 0x44ffff, 0xff8844, 0x8844ff];
    let currentColorIndex = 0;

    const bodyMaterial = new THREE.MeshStandardMaterial({
      color: carColors[currentColorIndex],
      roughness: 0.4,
      metalness: 0.7
    });

    const carBody = new THREE.Mesh(bodyGeometry, bodyMaterial);
    carBody.position.y = CAR_BODY_HEIGHT / 2;
    carBody.castShadow = true;
    carBody.receiveShadow = true;
    carGroup.add(carBody);

    // Angular roof wedge
    const roofGeometry = new THREE.BoxGeometry(1.6, 0.5, 2.0);
    const roofMaterial = new THREE.MeshStandardMaterial({
      color: 0x222222,
      roughness: 0.3,
      metalness: 0.8
    });
    const roof = new THREE.Mesh(roofGeometry, roofMaterial);
    roof.position.set(0, CAR_BODY_HEIGHT / 2 + 0.25, -0.3);
    roof.rotation.x = -0.1;
    roof.castShadow = true;
    carBody.add(roof);

    // Car number decals (simple boxes)
    const numberGeometry = new THREE.BoxGeometry(0.05, 0.4, 0.6);
    const numberMaterial = new THREE.MeshStandardMaterial({ color: 0xffffff });

    const numberLeft = new THREE.Mesh(numberGeometry, numberMaterial);
    numberLeft.position.set(-0.92, 0, 0);
    carBody.add(numberLeft);

    const numberRight = new THREE.Mesh(numberGeometry, numberMaterial);
    numberRight.position.set(0.92, 0, 0);
    carBody.add(numberRight);

    const numberRoof = new THREE.Mesh(numberGeometry, numberMaterial);
    numberRoof.position.set(0, CAR_BODY_HEIGHT / 2 + 0.5, -0.3);
    numberRoof.rotation.x = Math.PI / 2;
    carBody.add(numberRoof);

    // Wheels
    const wheelGeometry = new THREE.CylinderGeometry(WHEEL_RADIUS, WHEEL_RADIUS, WHEEL_WIDTH, 16);
    wheelGeometry.rotateZ(Math.PI / 2);

    const wheelMaterial = new THREE.MeshStandardMaterial({
      color: 0x1a1a1a,
      roughness: 0.8,
      metalness: 0.2
    });

    const hubcapGeometry = new THREE.CylinderGeometry(0.2, 0.2, WHEEL_WIDTH + 0.05, 8);
    hubcapGeometry.rotateZ(Math.PI / 2);
    const hubcapMaterial = new THREE.MeshStandardMaterial({
      color: 0xcccccc,
      roughness: 0.3,
      metalness: 0.9
    });

    const wheels = [];
    const wheelPositions = [
      { x: -1.0, z: -1.3 }, // Front left (negative Z is forward)
      { x: 1.0, z: -1.3 },  // Front right
      { x: -1.0, z: 1.3 },  // Rear left (positive Z is back)
      { x: 1.0, z: 1.3 }    // Rear right
    ];

    wheelPositions.forEach((pos, i) => {
      const wheelGroup = new THREE.Group();

      const wheelMesh = new THREE.Mesh(wheelGeometry, wheelMaterial);
      wheelMesh.castShadow = true;
      wheelMesh.receiveShadow = true;
      wheelGroup.add(wheelMesh);

      const hubcap = new THREE.Mesh(hubcapGeometry, hubcapMaterial);
      hubcap.position.x = pos.x > 0 ? 0.02 : -0.02;
      wheelGroup.add(hubcap);

      wheelGroup.userData = {
        restX: pos.x,
        restZ: pos.z,
        currentY: 0,
        isFront: i < 2
      };

      carGroup.add(wheelGroup);
      wheels.push(wheelGroup);
    });

    // ========== INPUT ==========
    const keys = {
      forward: false,
      backward: false,
      left: false,
      right: false,
      boost: false
    };

    window.addEventListener('keydown', (e) => {
      switch (e.key.toLowerCase()) {
        case 'w':
        case 'arrowup':
          keys.forward = true;
          break;
        case 's':
        case 'arrowdown':
          keys.backward = true;
          break;
        case 'a':
        case 'arrowleft':
          keys.left = true;
          break;
        case 'd':
        case 'arrowright':
          keys.right = true;
          break;
        case 'c':
          currentColorIndex = (currentColorIndex + 1) % carColors.length;
          bodyMaterial.color.setHex(carColors[currentColorIndex]);
          break;
        case ' ':
        case 'space':
          keys.boost = true;
          break;
        case 'r':
          // Reset position
          sphereState.position.set(0, 10, 0);
          sphereState.velocity.set(0, 0, 0);
          carGroup.rotation.set(0, 0, 0);
          totalDistance = 0;
          break;
      }
    });

    window.addEventListener('keyup', (e) => {
      switch (e.key.toLowerCase()) {
        case 'w':
        case 'arrowup':
          keys.forward = false;
          break;
        case 's':
        case 'arrowdown':
          keys.backward = false;
          break;
        case 'a':
        case 'arrowleft':
          keys.left = false;
          break;
        case 'd':
        case 'arrowright':
          keys.right = false;
          break;
        case ' ':
        case 'space':
          keys.boost = false;
          break;
      }
    });

    // ========== PHYSICS & GAME LOOP ==========
    let steerAngle = 0;
    let totalDistance = 0;
    let pitchVel = 0;
    let rollVel = 0;
    const cameraLookTarget = new THREE.Vector3();

    function getTerrainSlope(x, z, offsetX, offsetZ) {
      const y1 = getTerrainHeight(x, z);
      const y2 = getTerrainHeight(x + offsetX, z + offsetZ);
      const distance = Math.sqrt(offsetX * offsetX + offsetZ * offsetZ);
      return Math.atan2(y2 - y1, distance);
    }

    function computeSlopeAlongAxis(points, origin, axis) {
      if (points.length < 2) return 0;
      const dir = axis.clone().normalize();
      let minProj = Infinity;
      let maxProj = -Infinity;
      let minHeight = 0;
      let maxHeight = 0;

      points.forEach((pt) => {
        const relative = pt.clone().sub(origin);
        const projection = relative.dot(dir);
        if (projection < minProj) {
          minProj = projection;
          minHeight = pt.y;
        }
        if (projection > maxProj) {
          maxProj = projection;
          maxHeight = pt.y;
        }
      });

      const span = maxProj - minProj;
      if (Math.abs(span) < 0.001) return 0;
      return Math.atan2(maxHeight - minHeight, span);
    }

    function updatePhysics(dt) {
      // Get current terrain height under sphere
      const terrainY = getTerrainHeight(sphereState.position.x, sphereState.position.z);
      const sphereBottom = sphereState.position.y - SPHERE_RADIUS;

      // Ground collision
      if (sphereBottom <= terrainY) {
        sphereState.position.y = terrainY + SPHERE_RADIUS;
        sphereState.velocity.y = Math.max(0, sphereState.velocity.y);
        sphereState.onGround = true;
      } else {
        sphereState.onGround = false;
      }

      // Apply gravity
      if (!sphereState.onGround) {
        sphereState.velocity.y -= GRAVITY * dt;
      }

      // Get car forward direction
      const forward = new THREE.Vector3(0, 0, -1).applyQuaternion(carGroup.quaternion);
      const right = new THREE.Vector3(1, 0, 0).applyQuaternion(carGroup.quaternion);

      // Acceleration and braking (with turbo boost)
      if (keys.forward) {
        const currentSpeed = sphereState.velocity.length();
        const accelMul = keys.boost ? 3.0 : 1.0;
        const speedCap = MAX_SPEED * (keys.boost ? 1.5 : 1.0);
        if (currentSpeed < speedCap) {
          sphereState.velocity.add(forward.clone().multiplyScalar(ACCELERATION * accelMul * dt));
        }
      }
      if (keys.backward) {
        // Stronger force for reverse to make it usable
        const isReversing = sphereState.velocity.dot(forward) < 1.0;
        const force = isReversing ? 45 : BRAKE_FORCE;
        const brakeDir = forward.clone().multiplyScalar(-force * dt);
        sphereState.velocity.add(brakeDir);
      }

      // Steering - immediate response with exponential curve
      const targetSteer = keys.left ? MAX_STEER_ANGLE : keys.right ? -MAX_STEER_ANGLE : 0;
      steerAngle += (targetSteer - steerAngle) * STEERING_SPEED * dt;

      const forwardSpeed = sphereState.velocity.dot(forward);
      const reversingInput = keys.backward && !keys.forward;
      const reversingMotion = forwardSpeed < -1.0;
      const shouldInvertSteer = reversingMotion || (reversingInput && forwardSpeed < 8);

      // Rotate car immediately based on steering input
      if (sphereState.onGround && Math.abs(sphereState.velocity.length()) > 0.1) {
        const directionSign = shouldInvertSteer ? -1 : 1;

        // Use total velocity for turn authority so we can steer while drifting sideways
        const turnSpeed = (Math.abs(forwardSpeed) * 0.3 + sphereState.velocity.length() * 0.7);
        const turnRate = directionSign * steerAngle * turnSpeed * 0.35 * dt;
        carGroup.rotation.y += turnRate;
      }

      // Apply drift - velocity gradually follows car direction
      if (sphereState.onGround && sphereState.velocity.length() > 0.1) {
        const velocityDir = sphereState.velocity.clone().normalize();
        const targetDir = (shouldInvertSteer ? forward.clone().multiplyScalar(-1) : forward.clone());
        const blendAmount = Math.abs(steerAngle) > 0.01 ? 0.18 : 0.10;
        const blendedDir = velocityDir.lerp(targetDir, blendAmount);
        sphereState.velocity.copy(blendedDir.multiplyScalar(sphereState.velocity.length()));
      }

      // Ground friction
      if (sphereState.onGround) {
        sphereState.velocity.multiplyScalar(Math.max(0, 1 - 2.5 * dt));
      }

      // Air resistance
      sphereState.velocity.multiplyScalar(Math.max(0, 1 - 0.3 * dt));

      // Update position
      sphereState.position.add(sphereState.velocity.clone().multiplyScalar(dt));

      // Track distance
      totalDistance += sphereState.velocity.length() * dt;

      // Keep car on sphere position
      carGroup.position.copy(sphereState.position);

      // Update terrain chunks for infinite world
      updateTerrainChunks(sphereState.position.x, sphereState.position.z);

      // Calculate velocity for roll effects
      const velocityXZ = new THREE.Vector2(sphereState.velocity.x, sphereState.velocity.z).length();

      // Update matrices to ensure world positions are correct for raycasting
      carGroup.updateMatrixWorld(true);

      // Spring physics for body rotation
      let totalPitchTorque = 0;
      let totalRollTorque = 0;
      const SPRING_STIFFNESS = 50.0; // Increased to support car weight (Gravity 30)
      const DAMPING = 0.88; // Increased damping for stiffer springs
      const contactPoints = [];

      // Suspension settings
      const MIN_EXTENSION = 0.0; // Fully compressed
      const MAX_EXTENSION = WHEEL_RADIUS * 0.85; // Increased travel (droop)

      // Update wheel suspension with ray tracing along car body angle
      wheels.forEach((wheel, i) => {
        // Calculate mount point (axle) relative to car body
        // Mount is at the bottom corners of the car body box
        // carBody center is at (0, 0.4, 0) in carGroup.
        // Relative to carBody center, mount is at (restX, -0.4, restZ).
        const mountLocal = new THREE.Vector3(wheel.userData.restX, -CAR_BODY_HEIGHT / 2, wheel.userData.restZ);
        const mountWorld = mountLocal.applyMatrix4(carBody.matrixWorld);

        // Get car body's local down vector (accounts for pitch and roll)
        const bodyDownVector = new THREE.Vector3(0, -1, 0)
          .applyQuaternion(carBody.quaternion)
          .applyQuaternion(carGroup.quaternion)
          .normalize();

        // Start ray well above mount to avoid missing ground if mount is buried
        const RAY_START_OFFSET = 1.0;
        const rayOrigin = mountWorld.clone().add(bodyDownVector.clone().multiplyScalar(-RAY_START_OFFSET));

        // Raycast from elevated origin down along body's down vector
        raycaster.set(rayOrigin, bodyDownVector);
        const chunks = Array.from(terrainChunks.values());
        const intersects = raycaster.intersectObjects(chunks);
        wheel.userData.hasContact = false;
        wheel.userData.contactPoint = null;
        wheel.userData.contactNormal = null;

        let extensionDistance = MAX_EXTENSION;

        // Calculate compression for physics
        let compression = 0;

        if (intersects.length > 0) {
          wheel.userData.hasContact = true;
          const hit = intersects[0];
          const hitPoint = hit.point.clone();
          wheel.userData.contactPoint = hitPoint;

          if (hit.face) {
            // Transform local normal into world space so we can clamp along the terrain plane
            const normalMatrix = new THREE.Matrix3().getNormalMatrix(hit.object.matrixWorld);
            const worldNormal = hit.face.normal.clone().applyMatrix3(normalMatrix).normalize();
            wheel.userData.contactNormal = worldNormal;
          }

          contactPoints.push(hitPoint.clone());
          // Subtract the offset from hit distance to get real distance from mount
          const groundDistance = hit.distance - RAY_START_OFFSET;
          // Desired extension to touch ground
          const desiredExtension = groundDistance - WHEEL_RADIUS;

          // Clamp to valid range for visual
          extensionDistance = Math.max(MIN_EXTENSION, Math.min(desiredExtension, MAX_EXTENSION));

          // Calculate physics compression
          // If desiredExtension < MAX_EXTENSION, spring is compressed
          if (desiredExtension < MAX_EXTENSION) {
            compression = MAX_EXTENSION - desiredExtension;
            // Add extra stiffness if bottoming out (negative extension)
            if (desiredExtension < 0) {
              compression += -desiredExtension * 2.0; // Hard stop stiffness
            }
          }
        }

        // Apply spring force to body torque
        const force = compression * SPRING_STIFFNESS;

        // Front (Z < 0) -> Pitch Up (+X)
        totalPitchTorque += force * (wheel.userData.restZ < 0 ? 1 : -1);
        // Left (X < 0) -> Roll Right (-Z)
        totalRollTorque += force * (wheel.userData.restX < 0 ? -1 : 1);

        // Smooth suspension movement
        if (wheel.userData.currentExtension === undefined) wheel.userData.currentExtension = MAX_EXTENSION;
        wheel.userData.currentExtension = THREE.MathUtils.lerp(wheel.userData.currentExtension, extensionDistance, 0.3);
        // Hard clamp after smoothing
        wheel.userData.currentExtension = Math.max(MIN_EXTENSION, Math.min(wheel.userData.currentExtension, MAX_EXTENSION));

        // Position wheel along the ray from mount point
        let wheelWorldPos = mountWorld.clone().add(bodyDownVector.clone().multiplyScalar(wheel.userData.currentExtension));

        if (wheel.userData.hasContact && wheel.userData.contactPoint) {
          const CLEARANCE = 0.02;
          const surfaceNormal = (wheel.userData.contactNormal
            ? wheel.userData.contactNormal.clone()
            : bodyDownVector.clone().multiplyScalar(-1))
            .normalize();
          const safeCenter = wheel.userData.contactPoint.clone().add(
            surfaceNormal.clone().multiplyScalar(WHEEL_RADIUS - CLEARANCE)
          );
          const penetration = safeCenter.clone().sub(wheelWorldPos).dot(surfaceNormal);
          if (penetration > 0) {
            wheelWorldPos.copy(safeCenter);
            const projectedExtension = safeCenter.clone().sub(mountWorld).dot(bodyDownVector);
            const clampedExtension = Math.max(
              MIN_EXTENSION,
              Math.min(MAX_EXTENSION, projectedExtension)
            );
            wheel.userData.currentExtension = Math.min(
              wheel.userData.currentExtension,
              clampedExtension
            );
          }
        }

        // Convert world position back to local carGroup coordinates
        wheel.position.copy(wheelWorldPos);
        carGroup.worldToLocal(wheel.position);

        // Store accumulated roll in userData
        if (!wheel.userData.rollRotation) wheel.userData.rollRotation = 0;
        wheel.userData.rollRotation += velocityXZ * dt * 2;

        // Build wheel rotation: body tilt + steering (front only) + rolling
        const wheelQuat = new THREE.Quaternion();
        // Match car body's tilt
        wheelQuat.multiply(carBody.quaternion);

        // Apply steering (front only)
        if (wheel.userData.isFront) {
          const steerQuat = new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(0, 1, 0), steerAngle);
          wheelQuat.multiply(steerQuat);
        }

        // Apply rolling
        const rollQuat = new THREE.Quaternion().setFromAxisAngle(new THREE.Vector3(1, 0, 0), wheel.userData.rollRotation);
        wheelQuat.multiply(rollQuat);

        wheel.quaternion.copy(wheelQuat);
      });

      // Terrain following stabilization using actual wheel contacts
      let groundedCount = 0;
      wheels.forEach((wheel) => {
        if (wheel.userData.hasContact) groundedCount++;
      });

      if (groundedCount >= 2 && contactPoints.length >= 2) {
        const forwardAxis = new THREE.Vector3(0, 0, -1).applyQuaternion(carGroup.quaternion);
        const rightAxis = new THREE.Vector3(1, 0, 0).applyQuaternion(carGroup.quaternion);

        const slopePitch = computeSlopeAlongAxis(contactPoints, carGroup.position, forwardAxis);
        const slopeRoll = computeSlopeAlongAxis(contactPoints, carGroup.position, rightAxis);

        const targetPitch = slopePitch;
        const targetRoll = slopeRoll;

        const STABILIZE_STRENGTH = groundedCount === wheels.length ? 16.0 : 12.0;
        const pitchError = targetPitch - carBody.rotation.x;
        const rollError = targetRoll - carBody.rotation.z;

        totalPitchTorque += pitchError * STABILIZE_STRENGTH;
        totalRollTorque += rollError * STABILIZE_STRENGTH;
      }

      // Centrifugal force torque
      // Steer Left (+Angle) -> Roll Right (-Z)
      totalRollTorque -= steerAngle * velocityXZ * 0.08;

      // Integrate angular velocity
      pitchVel += totalPitchTorque * dt;
      rollVel += totalRollTorque * dt;

      // Apply damping
      pitchVel *= DAMPING;
      rollVel *= DAMPING;

      // Apply to body rotation
      carBody.rotation.x += pitchVel * dt;
      carBody.rotation.z += rollVel * dt;

      // Update HUD
      // Calibration: Wheelbase is 2.6 units. Assumed real wheelbase ~3.2m.
      // Scale: 1 unit ≈ 1.23m. Speed km/h = units/s * 1.23 * 3.6 ≈ units/s * 4.5
      document.getElementById('speed').textContent = Math.round(velocityXZ * 4.5);
      document.getElementById('distance').textContent = Math.round(totalDistance * 1.23);
    }

    // ========== CAMERA FOLLOW ==========
    function updateCamera() {
      const targetPos = carGroup.position.clone().add(
        CAMERA_OFFSET.clone().applyQuaternion(carGroup.quaternion)
      );
      camera.position.lerp(targetPos, CAMERA_FOLLOW_SPEED);

      // Camera look with lag (behindness)
      const lookTarget = carGroup.position.clone().add(new THREE.Vector3(0, 1, 0));
      cameraLookTarget.lerp(lookTarget, CAMERA_LOOK_SPEED);
      camera.lookAt(cameraLookTarget);

      // Keep the sun light following the car so shadows stay visible
      sunLight.position.copy(carGroup.position).add(new THREE.Vector3(50, 60, 30));
      sunLight.target.position.copy(carGroup.position);
      sunLight.target.updateMatrixWorld();
    }

    // ========== ANIMATION LOOP ==========
    const clock = new THREE.Clock();

    function animate() {
      requestAnimationFrame(animate);
      const dt = Math.min(clock.getDelta(), 0.1);

      updatePhysics(dt);
      updateCamera();

      renderer.render(scene, camera);
    }

    // ========== RESIZE ==========
    window.addEventListener('resize', () => {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    });

    // ========== START ==========
    setTimeout(() => {
      document.getElementById('loading').classList.add('hidden');
      animate();
    }, 500);
  </script>
  <script src="parental.js" defer></script>
</body>
</html>