Basic Shading
Basic Shading mode is designed to apply shading and light effects to the exterior surface of a volumetric object without affecting the interior. When this mode is active, volumetric objects are shaded as if they have a surface material applied to them rather than the actual volume material.
In this mode, light sources have a limited effect on the color and brightness of an object. Only the exterior surface of the object will be affected by light sources; light and shadows will not be generated within the object.

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