Sky
Sky
Simulates illumination by the sky hemisphere (but not the direct contribution due to the sun itself).
Shadows: Switch shadows on or off for this light source.
o Default: Off.
o Range: On / Off
Type: Specifies how the illumination is distributed over the sky. Six standard models are provided; three are from the Commission Internationale de L'Éclairage (CIE), and three are from the compatible North American body, the Illuminating Engineering Society of North America (IESNA).
o Default: CIE clear
o Range: CIE clear / CIE intermediate / CIE overcast / IESNA clear /IESNA intermediate / IESNA overcast
Min LOD: The minimum (initial) level of sampling detail.
o Default: 0.2.
o Range: 0.2 – 0.6
Shadow Tranparency: Specify the way that shadows through transparent objects are handled.
o Default: Global.
o Range: Displacement, Global, Interpolate, On
Error Bound: The degree of sampling error above which the sampling rate will be gradually increased toward the maximum. Smaller values will result in more detailed sampling at the cost of extra processing.
o Default: 0.5.
o Range: 0.01 – 2.00
Noise factor: Adding some `noise' to the sampling can reduce any visible artifacts caused by sampling errors.
o Default: 0.
o Range: 0.0 - Infinite
In case of “Sun direction”, different then “Time” and “Auto intensity” off, user will have in the sky options three more option to set: Color temperature, color and intensity. In case of auto intensity, these parameters are automatically calculated from the time and geographic position.
Color temperature: The color of the light may optionally be defined in terms of a temperature, in Kelvin. Set this to zero (the default) if you wish the color to be specified in terms of the RGB value only.
o Default: 6500.
o Range: 450 – 50000.
Color: The RGB color of the light emitted. Set this to white (the default) if you wish to specify a color temperature instead.
o Default: white.
o Range: RGB color.
Intensity: The luminance at the sky's zenith. If using Nit (candela per square meter) note that some real world values are as follows; clear sky 8000 Nit, overcast sky 2000 Nit.
o Default 0.
o Range: 0 – Infinite.
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