Three.js 使用着色器 实现跳动的心

Three.js 使用着色器 实现跳动的心

预览： https://threehub.cn/#/codeMirror?navigation=ThreeJS&classify=shader&id=jumpHeart

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'const box = document.getElementById('box')
const scene = new THREE.Scene()
const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)
camera.position.set(0, 0, 10)
const renderer = new THREE.WebGLRenderer()
renderer.setSize(box.clientWidth, box.clientHeight)
box.appendChild(renderer.domElement)
new OrbitControls(camera, renderer.domElement)
scene.add(new THREE.AxesHelper(50000))
window.onresize = () => {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect = box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()
}const { mesh, uniforms } = getShaderMesh()
scene.add(mesh)animate()
function animate() {uniforms.iTime.value += 0.01requestAnimationFrame(animate)renderer.render(scene, camera)
}function getShaderMesh() {const uniforms = {iTime: {value: 0},iResolution: {value: new THREE.Vector2(1900, 1900)},iChannel0: {value: window.iChannel0}}const geometry = new THREE.PlaneGeometry(20, 20);const material = new THREE.ShaderMaterial({uniforms,side: 2,depthWrite: false,transparent: true,vertexShader: `varying vec3 vPosition;varying vec2 vUv;void main() { vUv = uv; vec4 mvPosition = modelViewMatrix * vec4(position, 1.0);gl_Position = projectionMatrix * mvPosition;}`,fragmentShader: `uniform float iTime; uniform vec2 iResolution;  varying vec2 vUv;  void main(void) {vec2 p = (vUv - 0.5 ) * 2.0;// vec2 p = (2.0*fragCoord-iResolution.xy)/min(iResolution.y,iResolution.x);// background colorvec3 bcol = vec3(1.0,0.8,0.7-0.07*p.y)*(1.0-0.25*length(p));// animatefloat tt = mod(iTime,1.5)/1.5;float ss = pow(tt,.2)*0.5 + 0.5;ss = 1.0 + ss*0.5*sin(tt*6.2831*3.0 + p.y*0.5)*exp(-tt*4.0);p *= vec2(0.5,1.5) + ss*vec2(0.5,-0.5);// shape#if 0p *= 0.8;p.y = -0.1 - p.y*1.2 + abs(p.x)*(1.0-abs(p.x));float r = length(p);float d = 0.5;#elsep.y -= 0.25;float a = atan(p.x,p.y)/3.141593;float r = length(p);float h = abs(a);float d = (13.0*h - 22.0*h*h + 10.0*h*h*h)/(6.0-5.0*h);#endif// colorfloat s = 0.75 + 0.75*p.x;s *= 1.0-0.4*r;s = 0.3 + 0.7*s;s *= 0.5+0.5*pow( 1.0-clamp(r/d, 0.0, 1.0 ), 0.1 );vec3 hcol = vec3(1.0,0.4*r,0.3)*s;vec3 col = mix( bcol, hcol, smoothstep( -0.01, 0.01, d-r) );gl_FragColor = vec4(col,1.0);// gl_FragColor = vec4(col*1.3, 1.0);}`})const mesh = new THREE.Mesh(geometry, material);return {mesh,uniforms}
}/*** 名称: 跳动的心* 作者: stonerao https://github.com/stonerao
*/