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Focus controls the way that the light is concentrated in
the brightened areas of the facets to give some variety
to the way that the light source appears to be reflected in the
image. At 0 the light is fully dispersed over the facets and at
100 the light is concentrated into a single spot. Values in
between give a continuous spread between the extremes.
Highlight Intensity can
also be used to assist with adjustment of the Focus effect.
Highlight Intensity only affects the brightened areas of the facets
so it's particularly useful when the light is focused into a small
spot.
Note that focus has no effect on the darkened areas of the facets
and those are controlled independently by
Shadow Intensity
The following example shows Focus at two different settings.
Focus = 30
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Focus = 60
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