This section describes the meaning of the parameters related to "vray sun".
Enable: Sunlight switch.
Invisible: If this option is checked, the shape of the sun will not be displayed in the rendering effect.
Affect Diffuse: Determines whether the light affects the diffuse reflection of the object's material properties.
Affect Specular: Specular that determines whether the light affects the object's material properties.
Cast Atmospheric Shadows: Turn on this option to cast atmospheric shadows for a more realistic sunlight effect.
Turbidity: Controls the turbidity of the air, which affects the color of the vray sun and the vray sky. Smaller values indicate clear, clean air, when the color of the vray sun and vray sky is bluer;Larger values indicate dusty air (e.g., dust storms) where the color of the vray sun and vray sky appears yellow or even orange.
Ozone: refers to the amount of ozone in the air, and the smaller value of sunlight is more yellow;Larger values of sunlight are bluer.
Intensity Multiplier: Refers to the brightness of sunlight, the default value is 1.
Size multiplication: refers to the size of the sun, its role is mainly manifested in the degree of blurring of shadows, larger values can make the shadow of the sun more blurred.
Shadow Refinement: Refers to the segmentation of shadows, and larger values can make the shadows in the blurred area have a smoother effect and have no noise.
Shadow Offset: Used to control the distance of the object from the shadow, higher values will offset the shadow in the direction of the light.