Literally, it’s just lights. Three JS lights, more specifically (ambient, hemisphere, directional, point and spot lights). And shadows. And custom shader support, but I recommend you stick to this one I made. If you wanna know more about light types and how to properly light your scene, you can start here: https://threejs.org/docs/api/en/lights/DirectionalLight.html
Also there’s an event trigger for when the map loads, so it’s easier to configure each light individually on your scene.
Author: Russo
