bytev-charts/lib/plugin/three.js/examples/js/shaders/TriangleBlurShader.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

import "core-js/modules/es.array.join.js";
console.warn("THREE.TriangleBlurShader: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation.");
/**
 * Triangle blur shader
 * based on glfx.js triangle blur shader
 * https://github.com/evanw/glfx.js
 *
 * A basic blur filter, which convolves the image with a
 * pyramid filter. The pyramid filter is separable and is applied as two
 * perpendicular triangle filters.
 */

THREE.TriangleBlurShader = {
  uniforms: {
    "texture": {
      value: null
    },
    "delta": {
      value: new THREE.Vector2(1, 1)
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["#include <common>", "#define ITERATIONS 10.0", "uniform sampler2D texture;", "uniform vec2 delta;", "varying vec2 vUv;", "void main() {", "	vec4 color = vec4( 0.0 );", "	float total = 0.0;", // randomize the lookup values to hide the fixed number of samples
  "	float offset = rand( vUv );", "	for ( float t = -ITERATIONS; t <= ITERATIONS; t ++ ) {", "		float percent = ( t + offset - 0.5 ) / ITERATIONS;", "		float weight = 1.0 - abs( percent );", "		color += texture2D( texture, vUv + delta * percent ) * weight;", "		total += weight;", "	}", "	gl_FragColor = color / total;", "}"].join("\n")
};