bytev-charts/lib/plugin/three.js/examples/jsm/shaders/NormalMapShader.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";
import { Vector2 } from "../../../build/three.module.js";
/**
 * Normal map shader
 * - compute normals from heightmap
 */

var NormalMapShader = {
  uniforms: {
    "heightMap": {
      value: null
    },
    "resolution": {
      value: new Vector2(512, 512)
    },
    "scale": {
      value: new Vector2(1, 1)
    },
    "height": {
      value: 0.05
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["uniform float height;", "uniform vec2 resolution;", "uniform sampler2D heightMap;", "varying vec2 vUv;", "void main() {", "	float val = texture2D( heightMap, vUv ).x;", "	float valU = texture2D( heightMap, vUv + vec2( 1.0 / resolution.x, 0.0 ) ).x;", "	float valV = texture2D( heightMap, vUv + vec2( 0.0, 1.0 / resolution.y ) ).x;", "	gl_FragColor = vec4( ( 0.5 * normalize( vec3( val - valU, val - valV, height  ) ) + 0.5 ), 1.0 );", "}"].join("\n")
};
export { NormalMapShader };