Graphics Programs Reference
In-Depth Information
The different terms are typically used to describe the same effect at work in objects
of differing volumes or thickness. Translucency, for instance, is a term that is typically
applied to thin objects found exhibiting this scattering behavior. In such objects, we
will often see a big percentage of the light being transmitted into them still make its
way out of the opposite side of the volume, which is why we are able to see shadows
and shapes through the given examples of thin cotton curtains and piece of paper.
Subsurface scattering
(
SSS
) on the other hand is a term generally applied to ob-
jects with more volume to them, such as candles, blocks of soap, or fruits such as
grapes and tomatoes. Typically, these objects scatter the light in lots of directions,
with some of the thicker substances often bouncing much of the light back the way it
came.
SSS can sometimes give objects the appearance of having a glowing interior as in
the example of our grapes in the following photograph:
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