Additive
When the Additive modifier is active, material channels are applied to the environment behind the object instead of to the object's surface.
If you put an object on a bright background, it appears almost white. For best results, set your Ambient Color control to zero and render against a dark, plain background. Objects with this shading mode modifier selected will not cast shadows.
This mode is very useful for creating planets and quarter moons, light beams, and ghost images.


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