When talking about open world, one of the first things that pops in our mind is the necessity to simulate the real-world day and night cycle. UE4 is strong on this point. With just a few Blueprint nodes and a few changes at a default scene, you can create a perfect day cycle for your game.
Take a look at the default map of your game. In the world outliner you can find the two elements that, combined together, are the responsible of the lighting of our scene: the Light Source and the Sky Sphere.
Light Source, as the name suggests, is responsible for the illumination of the entire world. It is a directional light. A directional light simulates light that is being emitted from a source that is infinitely far away. This means that all shadows cast by this light will be parallel, making this the ideal choice for simulating sunlight.
Sky Sphere is basically a huge Static Mesh and is the responsible for what the player sees in the background, including the sun planet. You can open...