“使用 Three.js 的 WebGL 小实验。突出其在 Three.js 和 Matcap 材质上的创意应用。”
HTML：
<body></body>body {overflow: hidden;}
JAVASCRIPT：
const settings = {sizes: {width: window.innerWidth,height: window.innerHeight},boxDimensions: {h: 1.4,w: 1,}}//texturesconst textureLoader = new THREE.TextureLoader();const photoTexture02 = textureLoader.load('https://assets.codepen.io/4201020/city2.png?format=auto');const photoTexture03 = textureLoader.load('https://assets.codepen.io/4201020/shopp-e-1731593813681771088199459824.png');const photoTexture = textureLoader.load('https://assets.codepen.io/4201020/shopp-e-1731594468645280783813006762.png');photoTexture.wrapS = THREE.RepeatWrapping;photoTexture.wrapT = THREE.RepeatWrapping;photoTexture.repeat.set( .1, .1 );// initconst scene = new THREE.Scene();const camera = new THREE.PerspectiveCamera(75, settings.sizes.width / settings.sizes.height, 0.1, 1000);camera.position.set(0, 0, 3);camera.lookAt(0, 0, 0);scene.add(camera);const sun = new THREE.AmbientLight(0xffffff, .5);scene.add(sun);const planeGeometry = new THREE.PlaneGeometry(settings.boxDimensions.w, settings.boxDimensions.h);const renderer = new THREE.WebGLRenderer( { antialias: true } );renderer.setSize( window.innerWidth, window.innerHeight );renderer.setAnimationLoop( animation );document.body.appendChild( renderer.domElement );function RoundedPortalPhotoPlane(geometry, photoTexture) {const material = new THREE.MeshMatcapMaterial({matcap: photoTexture,transparent: true,})material.onBeforeCompile = (shader) => {shader.vertexShader = shader.vertexShader.replace('#include <common>',`varying vec4 vPosition;varying vec2 vUv;`);shader.vertexShader = shader.vertexShader.replace('#include <fog_vertex>',`vPosition = mvPosition;vUv = uv;`);shader.fragmentShader = shader.fragmentShader.replace(``varying vec4 vPosition;varying vec2 vUv;float roundedBoxSDF(vec2 CenterPosition, vec2 Size, float Radius) {return length(max(abs(CenterPosition)-Size+Radius,0.0))-Radius;}`);shader.fragmentShader = shader.fragmentShader.replace(``// The pixel space scale of the rectangle.vec2 size = vec2(1.0, 1.0);// How soft the edges should be (in pixels). Higher values could be used to simulate a drop shadow.float edgeSoftness = 0.001;// The radius of the corners (in pixels).float radius = 0.08;// Calculate distance to edge.float distance = roundedBoxSDF(vUv.xy - (size/2.0), size/2.0, radius);// Smooth the result (free antialiasing).float smoothedAlpha = 1.0-smoothstep(0.0, edgeSoftness * 2.0,distance);// Return the resultant shape.//vec4 quadColor = mix(vec4(1.0, 1.0, 1.0, 1.0), vec4(0.0, 0.2, 1.0, smoothedAlpha), smoothedAlpha);gl_FragColor = vec4(outgoingLight, smoothedAlpha);`);console.log(shader.fragmentShader);};const plane = new THREE.Mesh(geometry,material);return plane;}// planesconst planeGroup = new THREE.Group();const photoPlane01 = new RoundedPortalPhotoPlane(planeGeometry,photoTexture02);photoPlane01.position.set(-1, 0, 1);photoPlane01.rotation.y = Math.PI * 0.1;photoPlane01.name = 'plane1';planeGroup.add(photoPlane01);const photoPlane02 = new RoundedPortalPhotoPlane(planeGeometry,photoTexture);photoPlane02.position.set(0, 0, 0.5);photoPlane02.name = 'plane2';planeGroup.add(photoPlane02);const photoPlane03 = new RoundedPortalPhotoPlane(planeGeometry,photoTexture03);photoPlane03.position.set(1, 0, 1);photoPlane03.rotation.y = Math.PI * -0.1;photoPlane03.name = 'plane3';planeGroup.add(photoPlane03);scene.add(planeGroup);const mouse = new THREE.Vector2();let xParallaxFactor = -0.3;let yParallaxFactor = 0.3;//mouse eventswindow.addEventListener('mousemove', (event) => {mouse.x = event.clientX / settings.sizes.width * 2 - 1; //could also do it this way: map(event.clientX, 0, sizes.width, -1, 1)mouse.y = - (event.clientY / settings.sizes.height) * 2 + 1; //could also do it this way: map(event.clientY, 0, sizes.height, 1, -1)});// animationconst clock = new THREE.Clock()let previousTime = 0;function animation( time ) {const elapsedTime = clock.getElapsedTime()const deltaTime = elapsedTime - previousTime;previousTime = elapsedTime;const parallaxX = mouse.x * xParallaxFactor;const parallaxY = mouse.y * yParallaxFactor;planeGroup.rotation.y += (parallaxX - planeGroup.rotation.y) * 3 * deltaTime;planeGroup.rotation.x += (parallaxY - planeGroup.rotation.x) * 3 * deltaTime;renderer.render( scene, camera );}
源码：
https://codepen.io/smcnally000/pen/eYqXWyJ
体验：
https://codepen.io/smcnally000/full/eYqXWyJ
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