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228 Chapter 18: Effects and Environments
Glow Element rollout, Options panel
Apply Element To group
Lights—Applies the effect to lights picked in Lens
Effects Globals under the Parameters tab in the
Lights group box.
Image—Applies the effect to the rendered image
using p ar ameters set in Image Sources.
Image Centers—Applies to the center of an object
or to portions of an object as determined by the
Image Filters.
Image Sources group
Object ID—Applies the Lens Effect to particular
objects in your scene that have a corresponding
G-Buffer (page 3–946) (or Object) ID. The
G-Buffer is a geometry buffer and can b e defined
when you r ight-click any object and select
Properties f rom the menu. Then, s et the Object
Channel ID under the G-Buffer ID controls.
Mater ial ID—Applies the Lens Effect to an object
or part of an object with a specific Material ID
channel (page 2–1443) assigned to it. Assign the
Material ID channel in the Material Editor, using
the Material ID channel flyout (page 2–1444).
The Lens Effect will be applied only to areas of
the geometry where that particular ID channel is
present.
Tip: In some cases you might want to apply different
Lens Effects settings to different pieces of geometry
or IDs. To accomplish this, add additional Lens
Effects entries to the Lens Effects Parameters list.
Then set each different Lens Effect entry to affect a
different Material ID or Object ID and proceed.
Unclamp—An unclamped color is brighter than
pure white (255,255,255). The software keeps
track of these "hot" areas which tend to show
up when your scene contains bright metallic
highlights or explosions. This spinner lets you
determine the lowest pixel value that the Lens
Effect is applied to. Pure white has a pixel v alue of
1. When this spinner is set to 1, any pixels with
a value above 255 will be glowed. You can invert
this value by clicking the I button to the r ight of
the spinner.
Sur f Norm—Applies the Lens Effect to part of
an object, based on the angle of the surface
normal to the camera. A value of 0 is coplanar, or
parallel to the screen. A value of 90 is normal, or
perpendicular to the screen. If you set Surf Norm
to 45, only surfaces with normal angles greater
than 45 degrees will be glowed. You can invert this
value by clicking the I button to the right of the
spinner. This parameter can b e animated.
Whole—Applies the Lens Effect to the whole scene,
notjustaparticularpieceofgeometry.This,in
effect, makes each pixel in the scene a potential
Lens Effect source. The areas of the scene that have
the Lens Effect applied to them are determined by
thesettingsintheImageFiltersgroupbox.
Alpha—Applies the Lens Effect to the alpha
channel of an image. The transparency of an alpha