This page describes the Sphere Fade Volume feature in V-Ray.
Overview
VRaySphereFadeVolume is a volumetric node used to render just small parts of the scene by putting them in a special spherical locator.
In order to use the VRaySphereFade, the user first has to add a VRaySphereFadeVolume in the Environment Shader in the Volumetrics Overrides rollout. Then they can create VRaySphereFade nodes that can be used to specify which parts of the scene will be rendered out.
||Hypershade|| > Create panel > VRay section > Volumetric > VRay Sphere Fade Volume
||Create menu|| > V-Ray > Create VRaySphereFade
Sphere Fade Volume Attributes
Enabled – Tuns the VRaySphereFadeVolume on and off.
Falloff – A radius amount that is used to blend the inside of the VRaySphereFade with the Empty Color. For more information, please see the Relative Falloff example below.
Empty Color – Specifies the color outside the VRaySphereFade. For more information, please see the Empty Color example below.
Affect Alpha – Controls whether or not the alpha channel is affected.
Example: Relative Falloff
This example uses a sphere-shape locator with a radius of 390 aligned to the Viper fighter. This will provide the active area used by VRaySphereFade and has been added as an active object in the VRaySphereFade parameters list. By changing the value of the Falloff the amount of fade can be adjusted. The fade effect takes place from the locator itself inwards, so it must contain what you want to see in your render.
The Sphere locator has been aligned to the Viper fighter
VRaySphereFade with Falloff turned off
VRaySphereFade Falloff with a value of 0.0
VRaySphereFade Falloff with a value of 0.1
VRaySphereFade Falloff with a value of 0.2
VRaySphereFade Falloff with a value of 0.4
VRaySphereFade Falloff with a value of 0.8
Example: Empty Color
Like the previous examples on this page, this one uses a sphere-shape locator with a radius of 390 aligned to the Viper fighter. This will provide the active area used by VRaySphereFade and has been added as an active object in the VRaySphereFade parameters list. The Empty Color (the area outside of that affected by the VRaySphereFade locator and its falloff) can be changed from a default of mid-gray to any color required.
For the following example, the Relative falloff has been set to a value of 0.1.
VRaySphereFade Empty color set to mid-grey
VRaySphereFade Empty color set to black
VRaySphereFade Empty color set to mid green
Sphere Fade Attributes
Enabled – Turns the particular VRaySphereFade object on and off.
Radius – Controls the size of the sphere.
Shape – Adjusts the primitive dimensions between a Sphere, a Box, or a Cylinder.
Invert – Inverts the volume that is shaded, rendering the part of the scene that is outside the sphere. For more information, please see the Invert example below.
Settings – Specifies the V-Ray sphere fade volume attached to the current sphere object.
Example: Invert
The Invert can be turned on to only show everything visible in the scene outside of the Sphere fade volume. In the examples shown below a Falloff value of 0.1 has been used.
VRaySphereFade Invert turned off
VRaySphereFade Invert turned on