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238 Chapter 18: Effects and Environments
keeps all of the edges clean because it relies on the
scene alpha channel to derive its effect.
Peri m(eter )—Applies the Lens Effect only to the
perimeter of an object based on Edge interference.
Although not as precise as Perimeter Alpha, you
might need to use the Perimeter option at times
when the alpha channel is unavailable.
Bright—Filters the source objects based on their
brightness values. The effect is only applied to
objects with a brightness above the spinner setting
This option can b e inverted by clicking the I
button next to the spinner
Hue—Filtersthesourceobjectsbytheirhue.Select
the hue by clicking the color swatch next to the
spinner. You can choose hue values from 0 to 255.
ThespinnerbesidetheHuecolorswatchletsyou
enter a variance level so that the glow can find
several different hues in the same range as the
chosen color
Additional Effects group
AdditionalEffectsallowsyoutoapplymapssuch
as Noise to your Lens Effect. You can display the
Material/Map browser by clicking the long button
next to the Apply check box.
Apply—Applies the selected m ap when activated.
Radial Density—Determines w here and how much
you would like the additional effects applied.
Click ing the Radial Density button displays the
Radial Density dialog (page 3–252) .Usingthe
Radial Density dialog you can create points on
alineandmovethosepointsalongagraphto
determinewheretheadditionaleffectshouldbe
placed around the light. You can also use a map
to determine where the additional effect should
be placed.
Ma nual Secondary Lens E ff ect
Rendering menu > Effects > Environment and Effects
dialog > Effects panel > Add > Add Effect dialog > Lens
Effects > Choose Manual Secondary, and click the (>)
arrow button.
Manual secondary flares are additional secondary
flares that are indiv idually added to the lens flare.
These can b e used in addition to, or in place of
auto secondar y flares (page 3–234) .
You use Manual Secondar y flares when you want
toadduniqueflaresthatyoudon’twantrepeated.