How to apply HDRI(env)?

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4

Use RGBEloader to load the .hdr file, and in callback function use PMREMGenerator to generate the map from this HDR file. Then set the envMap parameter for your physical material:

let generator = new THREE.PMREMGenerator(renderer);

new RGBELoader().load('textures/gothic_manor_02_2k.hdr', (hdrmap) => {
    // ...
    let envmap = generator.fromEquirectangular(hdrmap);
    const ballMaterial = {
        // ...
        envMap: envmap.texture
    };
});