Diffusion

Diffusion determines how much direct light is reflected diffusely, or scattered, in all directions. The small arrows projecting off the surface of the object illustrate how diffusion works.

When light hits an object with diffusion set to 100% (right image), all the light that hits it is reflected back scattered in all directions. This gives the object a flatly lit appearance. If the object's diffusion is set to 0% (left image), no light is reflected off its surface so the object appears black. Diffusion controls how much light is diffusely reflected off the object's surface.

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