javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Load .GLTF - Car Path</title>
    <style>
    html, body {
        margin: 0;
        height: 100%;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script type="module">
import * as THREE from '../../build/three.module.js';
import {OrbitControls} from '../../examples/jsm/controls/OrbitControls.js';
import {GLTFLoader} from '../../examples/jsm/loaders/GLTFLoader.js';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 45;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 100;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(0, 10, 20);

  const controls = new OrbitControls(camera, canvas);
  controls.target.set(0, 5, 0);
  controls.update();

  const scene = new THREE.Scene();
  scene.background = new THREE.Color('black');

  {
    const planeSize = 40;

    const loader = new THREE.TextureLoader();
    const texture = loader.load('resources/images/checker.png');
    texture.wrapS = THREE.RepeatWrapping;
    texture.wrapT = THREE.RepeatWrapping;
    texture.magFilter = THREE.NearestFilter;
    const repeats = planeSize / 2;
    texture.repeat.set(repeats, repeats);

    const planeGeo = new THREE.PlaneGeometry(planeSize, planeSize);
    const planeMat = new THREE.MeshPhongMaterial({
      map: texture,
      side: THREE.DoubleSide,
    });
    const mesh = new THREE.Mesh(planeGeo, planeMat);
    mesh.rotation.x = Math.PI * -.5;
    scene.add(mesh);
  }

  {
    const skyColor = 0xB1E1FF;  // light blue
    const groundColor = 0xB97A20;  // brownish orange
    const intensity = 1;
    const light = new THREE.HemisphereLight(skyColor, groundColor, intensity);
    scene.add(light);
  }

  {
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.position.set(5, 10, 2);
    scene.add(light);
    scene.add(light.target);
  }

  function frameArea(sizeToFitOnScreen, boxSize, boxCenter, camera) {
    const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
    const halfFovY = THREE.MathUtils.degToRad(camera.fov * .5);
    const distance = halfSizeToFitOnScreen / Math.tan(halfFovY);
    // compute a unit vector that points in the direction the camera is now
    // in the xz plane from the center of the box
    const direction = (new THREE.Vector3())
        .subVectors(camera.position, boxCenter)
        .multiply(new THREE.Vector3(1, 0, 1))
        .normalize();

    // move the camera to a position distance units way from the center
    // in whatever direction the camera was from the center already
    camera.position.copy(direction.multiplyScalar(distance).add(boxCenter));

    // pick some near and far values for the frustum that
    // will contain the box.
    camera.near = boxSize / 100;
    camera.far = boxSize * 100;

    camera.updateProjectionMatrix();

    // point the camera to look at the center of the box
    camera.lookAt(boxCenter.x, boxCenter.y, boxCenter.z);
  }

  let curve;
  let curveObject;
  {
    const controlPoints = [
      [1.118281, 5.115846, -3.681386],
      [3.948875, 5.115846, -3.641834],
      [3.960072, 5.115846, -0.240352],
      [3.985447, 5.115846, 4.585005],
      [-3.793631, 5.115846, 4.585006],
      [-3.826839, 5.115846, -14.736200],
      [-14.542292, 5.115846, -14.765865],
      [-14.520929, 5.115846, -3.627002],
      [-5.452815, 5.115846, -3.634418],
      [-5.467251, 5.115846, 4.549161],
      [-13.266233, 5.115846, 4.567083],
      [-13.250067, 5.115846, -13.499271],
      [4.081842, 5.115846, -13.435463],
      [4.125436, 5.115846, -5.334928],
      [-14.521364, 5.115846, -5.239871],
      [-14.510466, 5.115846, 5.486727],
      [5.745666, 5.115846, 5.510492],
      [5.787942, 5.115846, -14.728308],
      [-5.423720, 5.115846, -14.761919],
      [-5.373599, 5.115846, -3.704133],
      [1.004861, 5.115846, -3.641834],
    ];
    const p0 = new THREE.Vector3();
    const p1 = new THREE.Vector3();
    curve = new THREE.CatmullRomCurve3(
      controlPoints.map((p, ndx) => {
        p0.set(...p);
        p1.set(...controlPoints[(ndx + 1) % controlPoints.length]);
        return [
          (new THREE.Vector3()).copy(p0),
          (new THREE.Vector3()).lerpVectors(p0, p1, 0.1),
          (new THREE.Vector3()).lerpVectors(p0, p1, 0.9),
        ];
      }).flat(),
      true,
    );
    {
      const points = curve.getPoints(250);
      const geometry = new THREE.BufferGeometry().setFromPoints(points);
      const material = new THREE.LineBasicMaterial({color: 0xff0000});
      curveObject = new THREE.Line(geometry, material);
      material.depthTest = false;
      curveObject.renderOrder = 1;
      scene.add(curveObject);
    }
  }

  const cars = [];
  {
    const gltfLoader = new GLTFLoader();
    gltfLoader.load('resources/models/cartoon_lowpoly_small_city_free_pack/scene.gltf', (gltf) => {
      const root = gltf.scene;
      scene.add(root);

      const loadedCars = root.getObjectByName('Cars');
      const fixes = [
        { prefix: 'Car_08', rot: [Math.PI * .5, 0, Math.PI * .5], },
        { prefix: 'CAR_03', rot: [0, Math.PI, 0], },
        { prefix: 'Car_04', rot: [0, Math.PI, 0], },
      ];

      root.updateMatrixWorld();
      for (const car of loadedCars.children.slice()) {
        const fix = fixes.find(fix => car.name.startsWith(fix.prefix));
        const obj = new THREE.Object3D();
        car.getWorldPosition(obj.position);
        car.position.set(0, 0, 0);
        car.rotation.set(...fix.rot);
        obj.add(car);
        scene.add(obj);
        cars.push(obj);
      }

      // compute the box that contains all the stuff
      // from root and below
      const box = new THREE.Box3().setFromObject(root);

      const boxSize = box.getSize(new THREE.Vector3()).length();
      const boxCenter = box.getCenter(new THREE.Vector3());

      // set the camera to frame the box
      frameArea(boxSize * 0.5, boxSize, boxCenter, camera);

      // update the Trackball controls to handle the new size
      controls.maxDistance = boxSize * 10;
      controls.target.copy(boxCenter);
      controls.update();
    });
  }

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;  // convert to seconds

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    for (const car of cars) {
      car.rotation.y = time;
    }

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>