javascript
/
three.js
镜像来自 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 - Shadows - Directional Light w/CameraHelper</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 {GUI} from '../../examples/jsm/libs/lil-gui.module.min.js';

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

  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(-1.4, 14, 12);

  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, planeSize, planeSize);
    const positionAttribute = planeGeo.attributes.position;
    for (let i = 0; i < positionAttribute.count; ++i) {
      positionAttribute.setZ(i, Math.random() * .2);
    }
    planeGeo.computeVertexNormals();

    const planeMat = new THREE.MeshPhongMaterial({
      map: texture,
      flatShading: true,
    });
    const mesh = new THREE.Mesh(planeGeo, planeMat);
    mesh.castShadow = true;
    mesh.receiveShadow = true;
    mesh.rotation.x = Math.PI * -.5;
    scene.add(mesh);
  }
  /*
  {
    const sphereRadius = 4;
    const sphereWidthDivisions = 32;
    const sphereHeightDivisions = 16;
    const phiStart = 0;
    const phiLength = Math.PI * 2;
    const thetaStart = Math.PI * .5;
    const thetaLength = Math.PI * .5;
    const sphereGeo = new THREE.SphereGeometry(
      sphereRadius,
      sphereWidthDivisions,
      sphereHeightDivisions,
      phiStart,
      phiLength,
      thetaStart,
      thetaLength,
    );
    const sphereMat = new THREE.MeshPhongMaterial({
      color: '#AC8',
      side: THREE.DoubleSide,
    });
    const mesh = new THREE.Mesh(sphereGeo, sphereMat);
    mesh.castShadow = true;
    mesh.receiveShadow = true;
    mesh.position.set(0, sphereRadius + 2, 0);
    scene.add(mesh);
  }
  */
  {
    const sphereRadius = 4;
    const sphereWidthDivisions = 32;
    const sphereHeightDivisions = 16;
    const sphereGeo = new THREE.SphereGeometry(
      sphereRadius,
      sphereWidthDivisions,
      sphereHeightDivisions,
    );
    const sphereMat = new THREE.MeshPhongMaterial({
      color: '#AC8',
    });
    const mesh = new THREE.Mesh(sphereGeo, sphereMat);
    mesh.castShadow = true;
    mesh.receiveShadow = true;
    mesh.position.set(0, 0, 0);
    scene.add(mesh);

  }

  class ColorGUIHelper {
    constructor(object, prop) {
      this.object = object;
      this.prop = prop;
    }
    get value() {
      return `#${this.object[this.prop].getHexString()}`;
    }
    set value(hexString) {
      this.object[this.prop].set(hexString);
    }
  }

  function makeXYZGUI(gui, vector3, name, onChangeFn) {
    const folder = gui.addFolder(name);
    folder.add(vector3, 'x', -10, 10).onChange(onChangeFn);
    folder.add(vector3, 'y', 0, 10).onChange(onChangeFn);
    folder.add(vector3, 'z', -10, 10).onChange(onChangeFn);
    // folder.open();
  }

  {
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.castShadow = true;
    light.position.set(4, 10, 5);
    light.target.position.set(-4, 1, -4);
    scene.add(light);
    scene.add(light.target);
    //light.shadow.bias = -0.001;
    light.shadow.camera.near = 0.000001;
    light.shadow.camera.far = 1000000;

    const cameraHelper = new THREE.CameraHelper(light.shadow.camera);
    scene.add(cameraHelper);

    const helper = new THREE.DirectionalLightHelper(light);
    scene.add(helper);

    function updateCamera() {
      // update the light target's matrixWorld because it's needed by the helper
      light.target.updateMatrixWorld();
      helper.update();
      // update the light's shadow camera's projection matrix
      light.shadow.camera.updateProjectionMatrix();
      // and now update the camera helper we're using to show the light's shadow camera
      cameraHelper.update();
    }
    updateCamera();

    class DimensionGUIHelper {
      constructor(obj, minProp, maxProp) {
        this.obj = obj;
        this.minProp = minProp;
        this.maxProp = maxProp;
      }
      get value() {
        return this.obj[this.maxProp] * 2;
      }
      set value(v) {
        this.obj[this.maxProp] = v /  2;
        this.obj[this.minProp] = v / -2;
      }
    }

    class MinMaxGUIHelper {
      constructor(obj, minProp, maxProp, minDif) {
        this.obj = obj;
        this.minProp = minProp;
        this.maxProp = maxProp;
        this.minDif = minDif;
      }
      get min() {
        return this.obj[this.minProp];
      }
      set min(v) {
        this.obj[this.minProp] = v;
        this.obj[this.maxProp] = Math.max(this.obj[this.maxProp], v + this.minDif);
      }
      get max() {
        return this.obj[this.maxProp];
      }
      set max(v) {
        this.obj[this.maxProp] = v;
        this.min = this.min;  // this will call the min setter
      }
    }

    const gui = new GUI();
    gui.addColor(new ColorGUIHelper(light, 'color'), 'value').name('color');
    gui.add(light, 'intensity', 0, 2);
    {
      const folder = gui.addFolder('Shadow Camera');
      folder.open();
      folder.add(new DimensionGUIHelper(light.shadow.camera, 'left', 'right'), 'value', 1, 100)
        .name('width')
        .onChange(updateCamera);
      folder.add(new DimensionGUIHelper(light.shadow.camera, 'bottom', 'top'), 'value', 1, 100)
        .name('height')
        .onChange(updateCamera);
      const minMaxGUIHelper = new MinMaxGUIHelper(light.shadow.camera, 'near', 'far', 0.1);
      folder.add(minMaxGUIHelper, 'min', 0.1, 50, 0.1).name('near').onChange(updateCamera);
      folder.add(minMaxGUIHelper, 'max', 0.1, 50, 0.1).name('far').onChange(updateCamera);
      folder.add(light.shadow.camera, 'zoom', 0.01, 1.5, 0.01).onChange(updateCamera);
    }

    makeXYZGUI(gui, light.position, 'position', updateCamera);
    makeXYZGUI(gui, light.target.position, 'target', updateCamera);
  }

  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() {

    resizeRendererToDisplaySize(renderer);

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

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

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