Arcgis 与 Claygl 可视化 glsl 特效篇（十六）

我决定不从claygl基础来讲了直接整合arcgis与claygl可视化来讲
关于整合clagyl 有兴趣看我这篇文章 arcgis 与 claygl 引擎结合做地图可视化

我整合一个类库后续不断更新中

初始化gismap4-claygl 类库， view是arcgis的sceneView对象

添加特效

import { ClayglMapManager} from "@haibalai/gismap4-claygl";
import * as clay from "claygl";
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;