Pic2: Environment Editor Layout
To change the time of day simply drag the control handle (triangle) in the timeline to either side. You cannot go beyond the 0 and 1 values since they represent a full 24 hour cycle.
We won’t be going over all of these parameters as some of them don’t require any changes for the generic earth like scenario we’re aiming for. We will however cover the sections that we are changing to get a better idea of what they control. We will also go through the process of creating smooth transitions as the time of day changes by using the curve editor.
In this example our goal is to achieve a generic day-night cycle at 45° latitude.
Pic3: Location of the Film Curve Whitepoint setting
Now we are ready to start creating our day-night cycle.
Pic4: Screenshot of the Sun Color gradient preview and curves
Sun intensity ( lux ) :
This property controls the illuminance of the sun and as mentioned previously it is important to keep this close to the physically based value. A quick search on the internet comes up with an average illuminance value of 100000 lux for bright sunlight.
Pic8: Screenshot taken at 05:30
Note the slight brightening of the horizon around the area where the sun is about to rise.
Moon outer corona scale – 2
Night Sky Multiplier
This section contains parameters that control the intensity of the colors used by the Night Sky. These only need to be set up once for the whole cycle and here are the values:
Pic31: Anisotropy (sun radial) 0.95 - 0.05 range
The sun is behind the camera on the right side. Notice how the radial color transitions from a localized effect to a global one as the value goes down.
Similarly to the corresponding option for regular fog this controls the maximum density fog can reach. It can be used to bring back background objects in extremely foggy scenarios.
Sun Rays Effect
This section contains all the different parameters that control the sun rays effect. The only one we will be changing for this particular scenario is the Sun rays attenuation.
This value defines the custom color that will be used by the sun rays if Sun rays suncolor influence is set to a value larger than 0.
This section contains the parameters that control the appearance of the ocean. We will be adjusting the Ocean Fog Color to reflect the changes in lighting as the time progresses.