// Load envMap.
var textureLoader = new THREE.TextureLoader();
var texture = textureLoader.load('/path/to/env.jpg');
// Load model.
modelLoader.load('/path/to/model.foo', (object) => {
// Apply envMap to model.
object.traverse((node) => {
if (node.isMesh) node.material.envMap = texture;
});
});