Arcgis 与 Claygl 可视化 glsl 特效篇（二十七）

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

npm i @haibalai/gismap4-claygl

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

import { ClayglMapManager} from "@haibalai/gismap4-claygl";
ClayglMapManager.init(view);

添加特效

import { ClayglMapManager} from "@haibalai/gismap4-claygl";
import * as clay from "claygl";
const fragmentShader = `
uniform float iTime;
uniform vec2 iResolution;
varying vec2 vUv;
#define USE_LIGHT 0
mat3 m = mat3( 0.00, 0.80, 0.60,
-0.80, 0.36, -0.48,
-0.60, -0.48, 0.64);
floathash(float n)
{
return fract(sin(n) * 43758.5453);
}
///
/// Noise function
///
floatnoise(in vec3 x)
{
vec3 p = floor(x);
vec3 f = fract(x);
f = f * f * (3.0 - 2.0 * f);
float n = p.x + p.y * 57.0 + 113.0 * p.z;
float res = mix(mix(mix(hash(n + 0.0), hash(n + 1.0), f.x),
mix(hash(n + 57.0), hash(n + 58.0), f.x), f.y),
mix(mix(hash(n + 113.0), hash(n + 114.0), f.x),
mix(hash(n + 170.0), hash(n + 171.0), f.x), f.y), f.z);
return res;
}
///
/// Fractal Brownian motion.
///
/// Refer to:
/// EN: https://thebookofshaders.com/13/
/// JP: https://thebookofshaders.com/13/?lan=jp
///
floatfbm(vec3 p)
{
float f;
f = 0.5000 * noise(p); p = m * p * 2.02;
f += 0.2500 * noise(p); p = m * p * 2.03;
f += 0.1250 * noise(p);
return f;
}
//////////////////////////////////////////////////
///
/// Sphere distance function.
///
/// But this function return inverse value.
/// Normal dist function is like below.
///
/// return length(pos) - 0.1;
///
/// Because this function is used for density.
///
floatscene(in vec3 pos)
{
return 0.1 - length(pos) * 0.05 + fbm(pos * 0.3);
}
///
/// Get normal of the cloud.
///
vec3 getNormal(in vec3 p)
{
constfloat e = 0.01;
return normalize(vec3(scene(vec3(p.x + e, p.y, p.z)) - scene(vec3(p.x - e, p.y, p.z)),
scene(vec3(p.x, p.y + e, p.z)) - scene(vec3(p.x, p.y - e, p.z)),
scene(vec3(p.x, p.y, p.z + e)) - scene(vec3(p.x, p.y, p.z - e))));
}
///
/// Create a camera pose control matrix.
///
mat3 camera(vec3 ro, vec3 ta)
{
vec3 cw = normalize(ta - ro);
vec3 cp = vec3(0.0, 1.0, 0.0);
vec3 cu = cross(cw, cp);