Page History

Preetham et al. – V-Ray Sky procedural texture is generated based on the Preetham et al. method.
CIE Clear – V-Ray Sky procedural texture is generated based on the CIE method for clear sky. 
CIE Overcast – V-Ray Sky procedural texture is generated based on the CIE method for cloudy sky.
Hosek et al. – V-Ray Sky procedural texture is generated based on the Hosek et al. method.
PRG Clear Sky – V-Ray Sky procedural texture is generated based on the PRG Clear Sky method which has enhanced sunrise and sunset sky.

Horizon Illum. – Specifies the intensity (in lx) of the illumination on horizontal surfaces coming from the sky.

Turbidity  – Determines the amount of dust in the air and affects the color of the sun and sky. Smaller values produce a clear, blue sky and sun as seen in rural areas, while larger values make them yellow and orange as seen in big cities. This parameter is inactive when the Sky Model is set to PRG. See the Turbidity example below.

Ozone – Affects the color of the light. Values closer to 0.0 make the sunlight yellow, and values closer to 1.0 make it blue. This parameter is inactive when the Sky Model is set to PRG. See the Ozone example below.

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Density – Controls the clouds density. A higher value leads to more clouds. See the Density example below.

Variety – Controls the cloud variety in space and shape. See the Variety example below.

Cirrus Amount – Controls the amount of high-altitude cirrus clouds. See the Cirrus Amount example below.

Height (m) – Controls the clouds height. See the  Height example below.

Thickness (m) – Controls the clouds thickness. See the Thickness example below.

Offset X (m) – Controls the offset in the X direction measured in meters.

Offset Y (m) – Controls the offset in the Y direction measured in meters.

Phase X (%) – Clouds phase in X direction specified in percentage (%).

Phase Y (%) – Clouds phase in Y direction specified in percentage (%).

Ground Shadows – Enables the clouds shadows, best suited for larger scenes. Note that it is recommended to use a Dome light with a Sky texture for high quality shadows. When disabled, a single shadow is cast over the entire scene depending on whether the sunlight reaching the camera position is blocked by a cloud. Disabling ground shadows is recommended for smaller scenes and may speed up the render process. See the Clouds Shadows example below.

Enscape Compatibility – Enabling the option changes the clouds to be visually similar to the Enscape ones.

<iframe width="560" height="315" src="https://www.youtube.com/embed/2kz_ZVHmLmQ?list=PLm2Irfq-UvZ1Rh8Tg-PPoYnOq_pKMs9_q" title="V-Ray 6 for SketchUp — Customize the sky with procedural clouds" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

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Invisible – When enabled, the sun becomes invisible to both the camera and the reflections. This is useful to prevent bright speckles on glossy surfaces where a ray with low probability hits the bright Sun disk.

Shadows – When enabled (the default), V-Ray Sun casts shadows. When disabled, the light does not cast shadows.

Affect Diffuse – When enabled, V-Ray Sun affects the diffuse properties of the materials.

Affect Specular – When enabled, V-Ray Sun affects the specular of the materials.

Affect Atmospherics – Specifies whether the light influences the atmospheric effects in the scene. The value determines the amount of involvement.

Atmospheric Shadows – When enabled, the atmospheric effects in the scene cast shadows.

Caustic Photons

Caustic Subdivisions – Determines the number of caustic photons emitted from the light source. Lower values mean more noisy results but faster rendering. Higher values produce smoother results but take more time.

Emit Radius – Defines the area around the V-Ray Sun from where the photons are shot.

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