Values close to 0.0 produce a sharper horizon line, while larger values produce a softer horizon line. In the real world, the average solar irradiance is about 1000 W/m^2 (see the References below). This example demonstrates the effect of the Size multiplier parameter. Ground Albedo Open the Shadows dialog in SketchUp under Windows -> Shadows. I then adjusted for solar noon on the equinox in order to align my shadows precisely along the north vector, which defaults to the Y-axis. Blend Angle – Specifies the angle in degrees where blending occurs between the horizon line and sky.
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