How to add appropriate light in the scene?
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In my project, I added several models and other geometry objects, and I could move camera to scan in the scene, but when I added lights as below, the model didn't show as it was. How should I add appropriate lights to suit well with models in the scene.

   var ambientLight = new THREE.AmbientLight(0x222222);
    scene.add(ambientLight);

    // add directional light source
    var directionalLight = new THREE.DirectionalLight(0xffffff,2);
    directionalLight.position.set(1, 1, 1).normalize();
    scene.add(directionalLight);

     var directionalLight1 = new THREE.DirectionalLight(0xffffff);
    directionalLight1.position.set(-1, -1, -1).normalize();
    scene.add(directionalLight1);
Wish for your advice!Thanks!