This page describes the Aerial Perspective atmospheric approximation.
The V-Ray Aerial Perspective atmospheric effect simulates aerial perspective, which is the effect that the Earth's atmosphere has on the appearance of objects that are viewed from a distance, similar to fog or haze. The atmospheric effect works together with the V-Ray Sun/Sky feature to calculate an approximation of the aerial perspective effect. It is faster to calculate than the V-Ray Environment Fog atmospheric, although the result is just an approximation. For example, the V-Ray Aerial Perspective atmospheric cannot produce volumetric shadows.
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Sun – Specifies the light in the scene that the Aerial Perspective effect is connected to. The light requires the V-Ray Sun package added.
Visibility Range – Specifies the distance at which the fog has absorbed 90% of the light coming from objects behind it. Lower values make the fog appear more dense, while larger values reduce the effect of the aerial perspective. For more information, see the Visible Distance example below.
Atmospheric Height – Controls the height of the atmosphere layer. Lower values can be used for artistic effects. For more information, see the Visible Height example below.
Inscattered Light Mult. – Controls the amount of sunlight scattered from the atmospheric effect. The default value 1.0 is physically accurate; lower or higher values could be used for artistic purposes.
Affect Environment – When disabled, the atmospheric effect is applied only to camera rays that hit actual objects, but not to rays that hit the sky. This is because the V-Ray Sky texture already takes into account the amount of scattered sunlight. However, it is possible to enable this option for artistic effects, especially with low visibility ranges. For more information, see the Affect Environment Rays example below.
Filter Color – Affects the color of the unscattered light. For more information, see the Filter Color example below.
Primary Visibility – When disabled, the aerial perspective effect will only be seen by secondary rays (e.g. refractions, reflections, etc.).
Example: Visibility Distance
Distance is 50 km
Distance is 100 km
Distance is 500 km
Example: Visibility Height
Atmospheric Height is 7 km
Atmospheric Height is 100 km
Example: Affect Environment Rays
Aerial Perspective is Disabled
Aerial Perspective is Enabled, Affect Environment is Disabled
The sky color and sun shadows are unaffected by the mist effect.
Aerial Perspective is Enabled, Affect Environment is Enabled
The mist effect blocks the sky and the sun light.
Example: Filter Color
Filter Color is White
1.0, 1.0, 1.0
Filter Color is Purple
0.23, 0.23, 1.0
Filter Color is Orange
1.0, 0.4, 0.18