Transparent shadows – Determines the behavior of the shadows when there are transparent objects in the scene. When enabled, V-Ray calculates shadows regardless of the light's Object Shadows settings (Color, Density, Map, etc.), however the color of shadows from transparent objects is correct. When disabled, the shadows take into account the Object Shadows parameters of the light, but shadows from transparent objects are monochromatic (shades of gray only). For more information, see The Changing Shadow Colors example below.
Bias – V-Ray can compute the shadows at a point that is slightly displaced towards the light from the actual surface being shaded. This may be useful to prevent "surface acne" (black spots on the surface because of incorrect self-shadowing).
Area shadow – Turns area shadows on and off.
Type – Determines the way in which the area shadows are calculated:
Box – V-Ray computes the shadows as if they were cast by a light source with the form of a box. Sphere– V-Ray computes the shadows as if they were cast by a light source with the form of a sphere.
U size – Specifies the U size of the light source V-Ray takes into account when computing area shadows (if Sphere light source is selected, U size corresponds to the sphere's radius).
V size – Specifies the V size of the light source V-Ray takes into account when computing area shadows (this parameter has no effect when Sphere light source is selected).
W size – Specifies the W size of the light source V-Ray takes into account when computing area shadows (this parameter has no effect whenSphere light source is selected).
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width
5%
Column
width
35%
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Example:Area Shadow Types: Box vs Sphere / U, V, W Sizes
