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The following parameters are available for Physical Sky Mode.

Intensity – Specifies the intensity of the Environment lighting.

Sky model – Specifies the use of location coordinates, date and time of day to control the sun position. See the Sky Model examples below.

Preetham et al. – The sky procedural texture is generated based on the Preetham et al. model.
CIE Clear – The sky procedural texture is generated based on the CIE method for a clear sky.
CIE Overcast – The sky procedural texture is generated based on the CIE method for a cloudy sky.
Hosek et al. – The sky procedural texture is generated based on the Hosek et al. model.
PRG Clear Sky (old) – The sky procedural texture is generated based on the PRG Clear Sky model (prior to V-Ray 7) which has enhanced sunrise and sunset sky.
PRG Clear Sky – The sky procedural texture is generated using the updated PRG Clear Sky method. The updated PRG Clear Sky allows for rendering the sky at various observer altitudes, up to several kilometers controlled by the Altitude parameter. It also supports rendering of nautical twilight effects with sun positions up to 12 degrees below the horizon. Additionally, it features enhanced turbidity control, enabling the rendering of sky conditions with turbidity values ranging from 1.81 to 4.89. See the PRG Clear Sky examples below.

Ground albedo – Sets the color of the ground.

Indirect hor illum – Specifies the intensity (in lx) of the illumination on horizontal surfaces coming from the sky. This parameter is enabled when one of the CIE Sky Models(CIE Clear, CIE Overcast) are selected.

Blend angle – Specifies the angle in degrees where blending will occur between the horizon line and sky. Values close to 0.0 produce a sharper horizon line, while larger values produce a softer horizon line. See the PRG Clear Sky - Blend Angle examples below.

Horizon offset – Allows you to manually lower the horizon line. See the PRG Clear Sky - Horizon Offset examples below.

Turbidity – Determines the amount of dust in the air, which in turn affects the color of the sun and sky. Smaller values produce a clear, blue sky and sun similar to what is seen in rural areas, while larger values make the sun and sky more yellow and orange. See the PRG Clear Sky - Turbidity examples below.

Altitude – Controls the observer's altitude in meters. As the altitude increases, sky clarity improves, and the horizon line becomes less defined. See the PRG Clear Sky - Turbidity examples below.

Ozone – Affects the color of the sun light. Available in the range between 0.0 and 1.0. Smaller values make the sunlight more yellow, while larger values make it bluer.