50 requests are triggered on environment texture

Questions
1

Screenshot (363)
Screenshot (363)1920×1080 383 KB

when i load the scene in environment texture 50 requests are triggered Parallel
const envTexture = CubeTexture.CreateFromPrefilteredData(“./assets/environment/environmentSpecular.env”, scene)
scene.environmentTexture = envTexture;
// scene.createDefaultSkybox(envTexture);
// scene.environmentIntensity = 0.2;
var blur = 0.8;
var myskybox = scene.createDefaultSkybox(envTexture, true, 10000, blur);

2

These are not true urls and they download nothing from a web site: they are blob urls that are created to generate the mipmaps of the cube texture.

The code is something like:

const bytes = imageData[i][face];
const blob = new Blob([bytes], { type: imageType });
const url = URL.createObjectURL(blob);

const image = new Image();
image.src = url;

// Enqueue promise to upload to the texture.
promise = new Promise<void>((resolve, reject) => {
    image.onload = () => {
        _OnImageReadyAsync(image, engine, expandTexture, rgbdPostProcess, url, face, i, generateNonLODTextures, lodTextures, cubeRtt, texture)
            .then(() => resolve())
            .catch((reason) => {
                reject(reason);
            });
    };
    image.onerror = (error) => {
        reject(error);
    };
});

It’s the image.src = url that you see in the network pane.

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