This page describes the Sphere Fade Volume feature in V-Ray.
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.
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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
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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.
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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.
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