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This page describes the use of V-Ray's physically accurate sun and sky system. Anchor
Overview
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Example: Direction of the VRaySun Light
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This example demonstrates the effect of the sun direction. The Sun is positioned such as its rays hit the ground at certain degrees. Note how in addition to the scene brightness, the sun position also changes the appearance of the sky and the sun light color.
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Sun Parameters
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Example: The Size Multiplier Parameter
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Enabled: on, Turbidity: 3.0, Shadow subdivision: 8, Intensity multiplier: 0.01
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Sky Parameters
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Anchor turbidityParameter turbidityParameter
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Example: The Turbidity Parameter
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Enabled: on, Intensity multiplier: 0.01, Shadow subdivision: 8, Size Size multiplier: 1.0
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Example: Ozone Value
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The Ozone parameter affects only the color of the light emitted by the sun. Higher values cause the color mapping mode to change. This example demonstrates the looks achieved with several different color mapping modes. See also the section on Color mapping for more details.
Enabled: on, Turbidity: 2.0, Shadow subdivision: 3, Intensity Intensity multiplier: 1.0, Size multiplier: 1.0.
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Options
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Sampling
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shadow subdivs – Controls the number of samples for the area shadow of the sun. More subdivs produce area shadows with better quality but render slower. For more information, see The Shadow Subdivs Parameter example below. Note that this parameter is available for changing only when Use local subdivs is enabled in the Global DMC Settings. This parameter is not available when the renderer is set to GPU.
photon emit radius – Determines the radius of the area where photons would be shot. This area is represented by the green cylinder around the Sun's ray vector. This parameter's effect is visible when photons are used in the GI solutions or caustics.
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Example: Shadow Bias
Enabled: on, Turbidity: 2.0, Intensity multiplier: 1.0, Size multiplier: 1.0. Notice how the shadows move towards the center of the render, that is towards the shadow casting object when the value is higher.
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Example: VRay Sun and Sky with Different Color Mapping Types
In addition to the parameters of the sun and sky, their appearance also depends on the selected color mapping mode. This example demonstrates the looks achieved with several different color mapping modes. See also the section on Color mapping for more details.
Enabled: on, Height Z: 800, Turbidity: 3.0, Intensity multiplier: 0.01, Size multiplier: 1.0
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Clouds
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Example: How to add and animate clouds, without an HDRI
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Example: Clouds Shadows
This examples shows the effect of the Ground Shadows option.
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Example: The Shadow Subdivs Parameter
This example demonstrates the effect of the Shadow subdivs parameter. Note how lower subdivs cause the shadows to be more noisy.
Enabled: on, Height Z: 1200, Turbidity is 2.0, Intensity multiplier is 0.01, Size multiplier: 10.0
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Example: Shadow Bias
Enabled: on, Turbidity: 2.0, Shadow subdivision: 3, Intensity multiplier: 1.0, Size multiplier: 1.0. Notice how the shadows move towards the center of the render, that is towards the shadow casting object when the value is higher.
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Example: VRay Sun and Sky with Different Color Mapping Types
In addition to the parameters of the sun and sky, their appearance also depends on the selected color mapping mode. This example demonstrates the looks achieved with several different color mapping modes. See also the section on Color mapping for more details.
Enabled: on, Height Z: 800, Turbidity: 3.0, Shadow subdivision: 8, Intensity multiplier: 0.01, Size multiplier: 1.0
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Example: Contrails Time
The frames in this animation show the Contrails time parameter with values ranging between 0 and 2.0, with a step of 0.2.
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Notes
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References
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Here is a list of links and references about the V-Ray Sun and Sky implementation, as well as general information about the illumination of the Sun.
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