Controls the color, transparency, and matte opacity of a volumetric material, such as light fog. This shader lets you connect other attributes and effects directly to its color, transparency, and matte opacity. The Volume Shader can be used with a Spot Light, Point Light, Environment Fog, and particles.
Find this material in the Create tab.
Defines the out color of the material. The default is black.
Sets the out Transparency of the material. The default is black, which is opaque.