The colour and intensity of sunlight have to be set manually if required. The software does not attempt here an automatic adjustment based on the position of the sun. The light source is just as bright shortly after sunrise, as at midday. The option to ‘Switch on and off automatically’ comes into effect when the position of the light source drops below zero height (z-coordinate), representing more or less a precise sunset. If this option is activated, the light source is then switched off, otherwise it continues to illuminate the scene, and shines from below the ground so to speak.