8

390 Chapter 19: Video Post-Production
Inter face
Effect group
Angle—Controls the angle of the highlight points
over the course of the animation. This parameter
can be
animated (page 3–365) .
Clamp—Determines the number of pixels highlig ht
must read to place a single highlight effect. In
many cases, you want to key your highlight effects
off of the brightness of objects that can produce
a lot of pixels to generate from. The end result is
something that looks like stadium lig hts from a
Monday Night Football game, where each pixel has
the highlight cross drawn on top of it, wh ich blurs
the o v erall effect. When you want only one or two
highlights, use this spinner to adjust how highlight
processes the chosen pixels. This parameter can
be animated.
Clamp value of 5
Clamp value of 15
As you can see, the Clamp value lets you maximize
or minimize the overall number of highlig hts
drawnoverthesameimage. Thiscanbea
tremendous time saver.
Alt. R ays—Alternates the lengths of points around
the highlight. I t works on every other ray point,
changing from the ray’s full length to a smaller one
based on the percentage spinner beneath it. This
parameter can be animated.
Alt. Rays tu rned off