Render 3D scene to cube map

[bhouston]

var ENV_CUBE_LOOK_DIR = [
    new Vec3(1.0, 0.0, 0.0),
    new Vec3(-1.0, 0.0, 0.0),
    new Vec3(0.0, 1.0, 0.0),
    new Vec3(0.0, -1.0, 0.0),
    new Vec3(0.0, 0.0, 1.0),
    new Vec3(0.0, 0.0, -1.0)
];

var ENV_CUBE_LOOK_UP = [
    new Vec3(0.0, -1.0, 0.0),
    new Vec3(0.0, -1.0, 0.0),
    new Vec3(0.0, 0.0, 1.0),
    new Vec3(0.0, 0.0, -1.0),
    new Vec3(0.0, -1.0, 0.0),
    new Vec3(0.0, -1.0, 0.0)
];

 var view = mat4.lookAt(camera.pos, camera.pos + ENV_CUBE_LOOK_DIR[side], ENV_CUBE_LOOK_UP[side]);
 var CUBE_PROJECTION = mat4.perspective(Math.PI/2, aspect, near, far);

source: https://stackoverflow.com/questions/34639572/render-to-cubemap-tutorial-in-webgl