Babylon.js/inspector/src/lodCube.ts

import { Effect } from "babylonjs/Materials/effect";

let name = 'lodCubePixelShader';
let shader = `
precision highp float;

varying vec2 vUV;
uniform samplerCube textureSampler;
uniform float lod;
void main(void)
{
    vec2 uv=vUV*2.0-1.0;
    #ifdef POSITIVEX
    gl_FragColor=textureCube(textureSampler,vec3(1.001,uv.y,uv.x),lod);
    #endif
    #ifdef NEGATIVEX
    gl_FragColor=textureCube(textureSampler,vec3(-1.001,uv.y,uv.x),lod);
    #endif
    #ifdef POSITIVEY
    gl_FragColor=textureCube(textureSampler,vec3(uv.y,1.001,uv.x),lod);
    #endif
    #ifdef NEGATIVEY
    gl_FragColor=textureCube(textureSampler,vec3(uv.y,-1.001,uv.x),lod);
    #endif
    #ifdef POSITIVEZ
    gl_FragColor=textureCube(textureSampler,vec3(uv,1.001),lod);
    #endif
    #ifdef NEGATIVEZ
    gl_FragColor=textureCube(textureSampler,vec3(uv,-1.001),lod);
    #endif
}`;

Effect.ShadersStore[name] = shader;
/** @hidden */
export var lodCubePixelShader = { name, shader };