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ThreeJS 轮廓线特效 OutLinePath

Terry

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发表于 2020-08-10 20:08:19

效果参照：
https://wow.techbrood.com/fiddle/56603

https://www.cnblogs.com/catherinezyr/p/7742357.html

![1597061/1597061411/1597061411283.jpg](http://www.bytev.com.cn////uploadfile/article/1597061/1597061411/1597061411283.jpg)

ThreeJS代码

```
<script type="module">

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

import Stats from '//techbrood.com/threejs/examples/jsm/libs/stats.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 { OBJLoader } from '//techbrood.com/threejs/examples/jsm/loaders/OBJLoader.js';
    import { EffectComposer } from '//techbrood.com/threejs/examples/jsm/postprocessing/EffectComposer.js';
    import { RenderPass } from '//techbrood.com/threejs/examples/jsm/postprocessing/RenderPass.js';
    import { ShaderPass } from '//techbrood.com/threejs/examples/jsm/postprocessing/ShaderPass.js';
    import { OutlinePass } from '//techbrood.com/threejs/examples/jsm/postprocessing/OutlinePass.js';
    import { FXAAShader } from '//techbrood.com/threejs/examples/jsm/shaders/FXAAShader.js';

var container, stats;
    var camera, scene, renderer, controls;
    var raycaster = new THREE.Raycaster();

var mouse = new THREE.Vector2();
    var selectedObjects = [];

var composer, effectFXAA, outlinePass;
    var obj3d = new THREE.Object3D();

var group = new THREE.Group();

var params = {
        edgeStrength: 3.0,
        edgeGlow: 0.0,
        edgeThickness: 1.0,
        pulsePeriod: 0,
        rotate: false,
        usePatternTexture: false
    };

// Init gui

var gui = new GUI( { width: 300 } );

gui.add( params, 'edgeStrength', 0.01, 10 ).onChange( function ( value ) {

outlinePass.edgeStrength = Number( value );

} );

gui.add( params, 'edgeGlow', 0.0, 1 ).onChange( function ( value ) {

outlinePass.edgeGlow = Number( value );

} );

gui.add( params, 'edgeThickness', 1, 4 ).onChange( function ( value ) {

outlinePass.edgeThickness = Number( value );

} );

gui.add( params, 'pulsePeriod', 0.0, 5 ).onChange( function ( value ) {

outlinePass.pulsePeriod = Number( value );

} );

gui.add( params, 'rotate' );

gui.add( params, 'usePatternTexture' ).onChange( function ( value ) {

outlinePass.usePatternTexture = value;

} );

var Configuration = function () {

this.visibleEdgeColor = '#ffffff';
        this.hiddenEdgeColor = '#190a05';

};

var conf = new Configuration();

gui.addColor( conf, 'visibleEdgeColor' ).onChange( function ( value ) {

outlinePass.visibleEdgeColor.set( value );

} );

gui.addColor( conf, 'hiddenEdgeColor' ).onChange( function ( value ) {

outlinePass.hiddenEdgeColor.set( value );

} );

init();
    animate();

function init() {

container = document.createElement( 'div' );
        document.body.appendChild( container );

var width = window.innerWidth;
        var height = window.innerHeight;

renderer = new THREE.WebGLRenderer();
        renderer.shadowMap.enabled = true;
        // todo - support pixelRatio in this demo
        renderer.setSize( width, height );
        document.body.appendChild( renderer.domElement );

scene = new THREE.Scene();

camera = new THREE.PerspectiveCamera( 45, width / height, 0.1, 100 );
        camera.position.set( 0, 0, 8 );

controls = new OrbitControls( camera, renderer.domElement );
        controls.minDistance = 5;
        controls.maxDistance = 20;
        controls.enablePan = false;
        controls.enableDamping = true;
        controls.dampingFactor = 0.05;

scene.add( new THREE.AmbientLight( 0xaaaaaa, 0.2 ) );

var light = new THREE.DirectionalLight( 0xddffdd, 0.6 );
        light.position.set( 1, 1, 1 );

light.castShadow = true;

light.shadow.mapSize.width = 1024;
        light.shadow.mapSize.height = 1024;

var d = 10;

light.shadow.camera.left = - d;
        light.shadow.camera.right = d;
        light.shadow.camera.top = d;
        light.shadow.camera.bottom = - d;

light.shadow.camera.far = 1000;

scene.add( light );

// model

var manager = new THREE.LoadingManager();

manager.onProgress = function ( item, loaded, total ) {

console.log( item, loaded, total );

};

var loader = new OBJLoader( manager );
        loader.load( '//techbrood.com/threejs/examples/models/obj/tree.obj', function ( object ) {

var scale = 1.0;

object.traverse( function ( child ) {

if ( child instanceof THREE.Mesh ) {

child.geometry.center();
                    child.geometry.computeBoundingSphere();
                    scale = 0.2 * child.geometry.boundingSphere.radius;

var phongMaterial = new THREE.MeshPhongMaterial( { color: 0xffffff, specular: 0x111111, shininess: 5 } );
                    child.material = phongMaterial;
                    child.receiveShadow = true;
                    child.castShadow = true;

}

} );

object.position.y = 1;
            object.scale.divideScalar( scale );
            obj3d.add( object );

} );

scene.add( group );

group.add( obj3d );

var geometry = new THREE.SphereBufferGeometry( 3, 48, 24 );

for ( var i = 0; i < 20; i ++ ) {

var material = new THREE.MeshLambertMaterial();
            material.color.setHSL( Math.random(), 1.0, 0.3 );

var mesh = new THREE.Mesh( geometry, material );
            mesh.position.x = Math.random() * 4 - 2;
            mesh.position.y = Math.random() * 4 - 2;
            mesh.position.z = Math.random() * 4 - 2;
            mesh.receiveShadow = true;
            mesh.castShadow = true;
            mesh.scale.multiplyScalar( Math.random() * 0.3 + 0.1 );
            group.add( mesh );

}

var floorMaterial = new THREE.MeshLambertMaterial( { side: THREE.DoubleSide } );

var floorGeometry = new THREE.PlaneBufferGeometry( 12, 12 );
        var floorMesh = new THREE.Mesh( floorGeometry, floorMaterial );
        floorMesh.rotation.x -= Math.PI * 0.5;
        floorMesh.position.y -= 1.5;
        group.add( floorMesh );
        floorMesh.receiveShadow = true;

var geometry = new THREE.TorusBufferGeometry( 1, 0.3, 16, 100 );
        var material = new THREE.MeshPhongMaterial( { color: 0xffaaff } );
        var torus = new THREE.Mesh( geometry, material );
        torus.position.z = - 4;
        group.add( torus );
        torus.receiveShadow = true;
        torus.castShadow = true;

stats = new Stats();
        container.appendChild( stats.dom );

// postprocessing

composer = new EffectComposer( renderer );

var renderPass = new RenderPass( scene, camera );
        composer.addPass( renderPass );

outlinePass = new OutlinePass( new THREE.Vector2( window.innerWidth, window.innerHeight ), scene, camera );
        composer.addPass( outlinePass );

var onLoad = function ( texture ) {

outlinePass.patternTexture = texture;
            texture.wrapS = THREE.RepeatWrapping;
            texture.wrapT = THREE.RepeatWrapping;

};

var loader = new THREE.TextureLoader();

loader.load( '//techbrood.com/threejs/examples/textures/tri_pattern.jpg', onLoad );

effectFXAA = new ShaderPass( FXAAShader );
        effectFXAA.uniforms[ 'resolution' ].value.set( 1 / window.innerWidth, 1 / window.innerHeight );
        composer.addPass( effectFXAA );

window.addEventListener( 'resize', onWindowResize, false );

window.addEventListener( 'mousemove', onTouchMove );
        window.addEventListener( 'touchmove', onTouchMove );

function onTouchMove( event ) {

var x, y;

if ( event.changedTouches ) {

x = event.changedTouches[ 0 ].pageX;
                y = event.changedTouches[ 0 ].pageY;

} else {

x = event.clientX;
                y = event.clientY;

}

mouse.x = ( x / window.innerWidth ) * 2 - 1;
            mouse.y = - ( y / window.innerHeight ) * 2 + 1;

checkIntersection();

}

function addSelectedObject( object ) {

selectedObjects = [];
            selectedObjects.push( object );

}

function checkIntersection() {

raycaster.setFromCamera( mouse, camera );

var intersects = raycaster.intersectObjects( [ scene ], true );

if ( intersects.length > 0 ) {

var selectedObject = intersects[ 0 ].object;
                addSelectedObject( selectedObject );
                outlinePass.selectedObjects = selectedObjects;

} else {

// outlinePass.selectedObjects = [];

}

function onWindowResize() {

var width = window.innerWidth;
        var height = window.innerHeight;

camera.aspect = width / height;
        camera.updateProjectionMatrix();

renderer.setSize( width, height );
        composer.setSize( width, height );

effectFXAA.uniforms[ 'resolution' ].value.set( 1 / window.innerWidth, 1 / window.innerHeight );

}

function animate() {

requestAnimationFrame( animate );

stats.begin();

var timer = performance.now();

if ( params.rotate ) {

group.rotation.y = timer * 0.0001;

}

controls.update();

composer.render();

stats.end();

}

</script>
```

CSS代码

```
body {
    margin: 0;
    background-color: #000;
    color: #fff;
    font-family: Monospace;
    font-size: 13px;
    line-height: 24px;
    overscroll-behavior: none;
}
a {
    color: #ff0;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
button {
    cursor: pointer;
    text-transform: uppercase;
}
canvas {
    display: block;
}
```

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