Note : This property can be used as a general scale when Dome Mode is set to one of the Finite Box options, allowing the proportional relationship among Dome Width, Dome Height, and Dome Depth of the box to be maintained.
The properties in this group are responsible for establishing the position of the sun (the direction of the sunlight), controlling what the visible sun looks like when it is in view and creating the color gradient that represents the atmospheric skydome, which is then used to light the scene, show the sky to the camera, and show the sky in reflections.
Note 1: The horizon does not actually exist at any specific “height” in 3D space—it is a shading effect for rays that go below a certain angle. This property tweaks the angle. The total range available range is somewhat extreme, reaching from -10.0 (the horizon is “straight down”) to 10.0 (the horizon is at the zenith). In practice, only much smaller values are actually useful, like -0.2 to push the horizon down just below the edge of a finite visible ground plane.
Note 2 : This property affects not only the visual representation of the horizon in the environment but also the color of the sun itself, i.e., the point where the sun “sets” will change for a non-zero value.
The Ground properties control an implicit ground plane, which acts as a “shadow catcher” and/or a modifier for the environment dome geometry when a map is in use.