Cesium 与 Babylon.js 可视化 glsl 特效篇（十六）

我决定不从Babylonjs 基础来讲了 直接整合cesium与babylonjs可视化来讲

我整合一个类库 后续不断更新中

npm i @haibalai/cesium-babylonjs

初始化cesium -babylonjs 类库， map 是cesium 的viewer对象

import { BabylonMapManager } from “@haibalai/cesium-babylonjs”;
BabylonMapManager.init(map);

添加特效

import { BabylonMapManager } from “@haibalai/cesium-babylonjs”;
 const fragmentShader = `
 precision highp float;
 uniform float iTime;
 const vec2 iResolution = vec2(1.0,1.0);
 varying vec2 vUv;
 vec3 rY(vec3 p, float a) {
 vec3 q = p;
 float c = cos(a);
 float s = sin(a);
 q.x = c * p.x + s * p.z;
 q.z = -s * p.x + c * p.z;
 return q;
 }
 // returns a pair of values for the distances along the ray at which there are sphere intersections, or 0 if none
 vec2 sphereIntersectionDistances(vec3 rayOrigin, vec3 rayDirection, vec3 sphereOrigin, float sphereRadius) {
 vec3 toCenter = sphereOrigin - rayOrigin;
 float toCenterAlongRay = dot(toCenter, rayDirection);
 float perpendicularDistanceSquared = dot(toCenter, toCenter) - toCenterAlongRay * toCenterAlongRay;
 float radiusSquared = sphereRadius * sphereRadius;
 if (perpendicularDistanceSquared > radiusSquared) { // ray doesn’t touch the sphere
 return vec2(0.);
 }
 float insideSphereAlongRay = sqrt(radiusSquared - perpendicularDistanceSquared); // half the length of the portion of the ray inside the sphere
 float intersection1 = toCenterAlongRay - insideSphereAlongRay;
 float intersection2 = toCenterAlongRay + insideSphereAlongRay;

Cesium 与 Babylon.js 可视化 glsl 特效篇（十六） － 小专栏