LightSun

The V-Ray Sun and VRaySky are special features which are provided by the V-Ray renderer. Developed to work together, the LightSun and VRaySky reproduce the real-life sun and sky environment of the Earth. Both are coded so that they change their appearance depending on the direction of the LightSun.

Light linking is used to create a list of objects that can be excluded (or included) from the light's effects such as illumination or shadow casting.

List Type – Specifies whether the objects in the list are considered included or excluded from the light's effects.

Light Linking – Creates a list of objects to be excluded or included.

Intensity Multiplier – The brightness of the sun. Since the sun is very bright by default, you can use this parameter to reduce its effect.

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 as seen in a big city.

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.

Size Multiplier – Controls the visible size of the sun. This affects the appearance of the sun disc as seen by the camera and reflections, as well as the blurriness of the sun shadows.

Sky Model – Determines the procedural model used to generate the VRaySky texture:

Hosek et al. – The VRaySky procedural texture is generated based on the Hosek et al. method. 
Preetham et al. – The VRaySky procedural texture is generated based on the Preetham et al. method.

Horiz 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 are selected.

Color Mode – This mode affects the way the Filter Color hues the sun and sky light. 

Filter – Shifts the V-Ray Sun and Sky hue towards the color specified by the Filter Color.
Direct – Takes the Filter Color for the V-Ray Sun light. In this case, the light intensity is controlled by the Intensity multiplier and it does not depend on the Sun's position in the sky.
Override – Takes the Filter Color for the V-Ray Sun light, however the intensity is controlled by the position of the V-Ray Sun in the sky. 

Filter Color – Shifts the hue of the V-Ray Sun and Sky system towards the specified color.

Ground Albedo – Sets the color of the V-Ray Sun and Sky system's ground.

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.

Horizon Offset – Allows the user to manually lower the horizon line.

Water Vapour –

Enabled – Turns the sun light on and off.

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

Affect Diffuse – Determines whether the Sun is affecting the diffuse properties of the materials.

Affect Specular – Determines whether the Sun is affecting the specular of the materials. The multiplier controls the suns contribution to specular reflections.

Diffuse Contribution – Controls the Sun's contribution to the diffuse illumination.

Specular Contribution – Controls the Sun's contribution to the specular reflection.

Bumped Below Surface Check –

Shadows – When enabled, the objects in the scene cast shadows.

Shadow Color – Controls the color of shadows for this light. Note that anything different from black is not physically correct.

Shadow Color Tex – Specifies a texture map for the shadows.

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

Shadow Bias – Moves the shadow toward or away from the shadow-casting object (or objects). Higher values move the shadow toward the object(s), while lower values move it away. If this value is too extreme, shadows can "leak" through places they shouldn't or "detach" from an object. Other effects from extreme values include moire patterns, out-of-place dark areas on surfaces, and shadows not appearing at all in the rendering.

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. 

Photon Radius – Determines the radius of the area in which photons will be shot. This area is represented by the cylinder around the Sun's ray vector. This parameter has effect when photons are used in caustics. 

Photon Subdivs –

Caustic Subdivs – Used by V-Ray when calculating Caustics. Lower values mean more noisy results but will render faster. Higher values produce smoother results but take more time.

Diffuse Mult –

Caustic Mult – Used by V-Ray when calculating Caustics. This multiplier controls the brightness of the caustics. 

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Camera Dependent –

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