For some of those parameters, this topic provides a brief explanation plus a link to the main topic with additional details. A number of mr Physical Sky parameters are common to all three Sun & Sky components. This topic mainly provides information on parameters unique to this component. The mr Physical Sky shader is intended primarily for use in the mental ray Sun & Sky combination. A number of mr Sky parameters are common to all three Sun & Sky components. The mr Sky light is intended for use in the mental ray Sun & Sky combination. The mr Sun light is intended for use in the mental ray Sun & Sky combination. For example, to push the horizon down just below the edge of a finite visible ground plane, use –0.2. In practice, only much smaller values are actually useful. 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). Note that this horizon doesn’t actually exist at a specific height in 3D space it is a shading effect for rays that go below a certain angle. This parameter allows tuning the position of the horizon. It can also cause issues rendering locations that are supposed to be at a high altitude, like mountain tops or the top of New York skyscrapers where the horizon really is visibly “below” the viewer. However, because the horizon is infinitely far away, this can cause trouble joining up with any finite geometry that is supposed to represent the ground. The default value, 0.0, places the horizon at a standard height. Horizon and Ground group Horizon Height The vertical position of the horizon.
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