three.js光探测器（lightprobe）代码示例

灯光探测是向3D场景添加灯光的另一种方法。与传统光源（如平行光、点光源或聚光灯）不同，光探头不发光。相反，它们存储有关通过三维空间的光的信息。在渲染过程中，通过使用来自灯光探测器的数据来近似撞击3D对象的灯光。光探测器通常由（辐射）环境贴图创建。

three, light

《three.js使用多个渐变torus模拟光环光晕》申请公开！

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JavaScript

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CSS

HTML

import * as THREE from '//techbrood.com/threejs/build/three.module.js';

import { GUI } from '//techbrood.com/threejs/examples/jsm/libs/dat.gui.module.js';

import { OrbitControls } from '//techbrood.com/threejs/examples/jsm/controls/OrbitControls.js';
    import { LightProbeGenerator } from '//techbrood.com/threejs/examples/jsm/lights/LightProbeGenerator.js';

let mesh, renderer, scene, camera;

let gui;

let lightProbe;
    let directionalLight;

// linear color space
    const API = {
        lightProbeIntensity: 1.0,
        directionalLightIntensity: 0.2,
        envMapIntensity: 1
    };

init();

function init() {

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

// tone mapping
        renderer.toneMapping = THREE.NoToneMapping;

renderer.outputEncoding = THREE.sRGBEncoding;

// scene
        scene = new THREE.Scene();

// camera
        camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
        camera.position.set( 0, 0, 30 );

// controls
        const controls = new OrbitControls( camera, renderer.domElement );
        controls.addEventListener( 'change', render );
        controls.minDistance = 10;
        controls.maxDistance = 50;
        controls.enablePan = false;

// probe
        lightProbe = new THREE.LightProbe();
        scene.add( lightProbe );

// light
        directionalLight = new THREE.DirectionalLight( 0xffffff, API.directionalLightIntensity );
        directionalLight.position.set( 10, 10, 10 );
        scene.add( directionalLight );

// envmap
        const genCubeUrls = function ( prefix, postfix ) {

return [
                prefix + 'px' + postfix, prefix + 'nx' + postfix,
                prefix + 'py' + postfix, prefix + 'ny' + postfix,
                prefix + 'pz' + postfix, prefix + 'nz' + postfix
            ];

};

const urls = genCubeUrls( '//techbrood.com/threejs/examples/textures/cube/pisa/', '.png' );

new THREE.CubeTextureLoader().load( urls, function ( cubeTexture ) {

cubeTexture.encoding = THREE.sRGBEncoding;

scene.background = cubeTexture;

lightProbe.copy( LightProbeGenerator.fromCubeTexture( cubeTexture ) );

const geometry = new THREE.SphereGeometry( 5, 64, 32 );
            //const geometry = new THREE.TorusKnotGeometry( 4, 1.5, 256, 32, 2, 3 );

const material = new THREE.MeshStandardMaterial( {
                color: 0xffffff,
                metalness: 0,
                roughness: 0,
                envMap: cubeTexture,
                envMapIntensity: API.envMapIntensity,
            } );

// mesh
            mesh = new THREE.Mesh( geometry, material );
            scene.add( mesh );

render();

} );

// gui
        gui = new GUI();

gui.width = 300;

gui.domElement.style.userSelect = 'none';

const fl = gui.addFolder( 'Intensity' );

fl.add( API, 'lightProbeIntensity', 0, 1, 0.02 )
            .name( 'light probe' )
            .onChange( function () {

lightProbe.intensity = API.lightProbeIntensity; render();

} );

fl.add( API, 'directionalLightIntensity', 0, 1, 0.02 )
            .name( 'directional light' )
            .onChange( function () {

directionalLight.intensity = API.directionalLightIntensity; render();

} );

fl.add( API, 'envMapIntensity', 0, 1, 0.02 )
            .name( 'envMap' )
            .onChange( function () {

mesh.material.envMapIntensity = API.envMapIntensity; render();

} );

fl.open();

// listener
        window.addEventListener( 'resize', onWindowResize );

}

function onWindowResize() {

renderer.setSize( window.innerWidth, window.innerHeight );

camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();

render();

}

function render() {

renderer.render( scene, camera );

}

</script>

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