void UpdateSun()
{
// Rotate the sun 360 degrees around the x-axis according to the current time of day.
// We subtract 90 degrees from this to make the sun rise at 0.25 instead of 0.
// I just found that easier to work with.
// The y-axis determines where on the horizon the sun will rise and set.
// The z-axis does nothing.
sun.transform.localRotation = Quaternion.Euler ((currentTimeOfDay * 360f) - 90, 170, 0);
// The following determines the sun's intensity according to current time of day.
// You'll notice I have hardcoded a bunch of values here. They were just the values
// I felt worked best. This can obviously be made to be user configurable.
// Also with some more clever code you can have different lengths for the day and
// night as well.
// The sun is full intensity during the day.
float intensityMultiplier = 1;
// Set intensity to 0 during the night night.
if (currentTimeOfDay <= 0.23f || currentTimeOfDay >= 0.75f) {
intensityMultiplier = 0;
}
// Fade in the sun when it rises.
else if (currentTimeOfDay <= 0.25f) {
// 0.02 is the amount of time between sunrise and the time we start fading out
// the intensity (0.25 - 0.23). By dividing 1 by that value we we get get 50.
// This tells us that we have to fade in the intensity 50 times faster than the
// time is passing to be able to go from 0 to 1 intensity in the same amount of
// time as the currentTimeOfDay variable goes from 0.23 to 0.25. That way we get
// a perfect fade.
intensityMultiplier = Mathf.Clamp01 ((currentTimeOfDay - 0.23f) * (1 / 0.02f));
}
// And fade it out when it sets.
else if (currentTimeOfDay >= 0.73f) {
intensityMultiplier = Mathf.Clamp01 (1 - ((currentTimeOfDay - 0.73f) * (1 / 0.02f)));
}
// Multiply the intensity of the sun according to the time of day.
sun.intensity = sunInitialIntensity * intensityMultiplier;
}
