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January 15, 2021 12:02
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Chromakey Video three.js
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| body { | |
| margin: 0; | |
| } | |
| canvas { | |
| display: block; | |
| } | |
| video { | |
| display: none; | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <link rel="stylesheet" href="index.css" /> | |
| </head> | |
| <body> | |
| <script type="module" src="index.js"></script> | |
| </body> | |
| </html> |
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| import { | |
| WebGLRenderer, | |
| PerspectiveCamera, | |
| Scene, | |
| Color, | |
| VideoTexture, | |
| ShaderMaterial, | |
| PlaneBufferGeometry, | |
| Mesh, | |
| } from 'https://unpkg.com/three/build/three.module.js'; | |
| const renderer = new WebGLRenderer({ alpha: true, antialias: true }); | |
| renderer.setSize(window.innerWidth, window.innerHeight); | |
| renderer.setPixelRatio(2); | |
| document.body.appendChild(renderer.domElement); | |
| const camera = new PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.01, 10); | |
| camera.position.z = 2; | |
| const scene = new Scene(); | |
| // https://krpano.com/releases/1.20.9/viewer/examples/chromakey/video.mp4 | |
| const video = document.createElement('video'); | |
| video.src = 'video.mp4'; | |
| video.autoplay = true; | |
| video.loop = true; | |
| const material = new ShaderMaterial({ | |
| uniforms: { | |
| video: { | |
| type: 't', | |
| value: new VideoTexture(video) | |
| }, | |
| color: { | |
| type: 'c', | |
| value: new Color(0x238E54) | |
| } | |
| }, | |
| vertexShader: ` | |
| varying vec2 vUv; | |
| void main(void) { | |
| vUv = uv; | |
| vec4 mvPosition = modelViewMatrix * vec4(position, 1.0); | |
| gl_Position = projectionMatrix * mvPosition; | |
| } | |
| `, | |
| fragmentShader: ` | |
| uniform sampler2D video; | |
| uniform vec3 color; | |
| varying vec2 vUv; | |
| void main(void) { | |
| vec3 tColor = texture2D(video, vUv).rgb; | |
| float a = (length(tColor - color) - 0.2) * 7.0; | |
| gl_FragColor = vec4(tColor, a); | |
| } | |
| `, | |
| transparent: true | |
| }); | |
| const geometry = new PlaneBufferGeometry(1, 2); | |
| const plane = new Mesh(geometry, material); | |
| scene.add(plane); | |
| renderer.setAnimationLoop(() => { | |
| renderer.render(scene, camera); | |
| }); |
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