Active: will toggle the directional light for the level.
Direction: 3D vector indicating where the light will point at.
Diffuse: the diffuse color for the light.
Sky color: objects will reflect shades of this color on their upper side.
Ground color: objects will reflect shades of this color on their lower side.
Brightness: brightness for the light.
Cast shadows: if the light should cast shadows.
Shadow map bias mul: tweak to move the shadow away from the light to remove shadow banding and artifacts.
Shadow map slope scale bias mul: tweak to move triangles even further away from the light if the angle to the light is steep.
Shadow caster distance: sets how far our light source will be when it comes to casting shadows. Increase to remove artifacts caused by shadows. A too high of a number will make shadows start to disappear.