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224 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 parameters 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 3–1040) (or O bject) ID. The
G-Buffer is a geometry buffer and can be defined
when you right-click any object and select
Propertie s from the m enu. T hen, s et the Object
Channel ID under the G-Buffer ID controls.
Effects ID—Applies the Lens Effect to an object or
part of an object with a specific Effects ID assigned
to it. Effects ID’s are applied in the materials
editor by assigning the material one of the Material
Effects channels that are available. The Lens Effect
will only be applied to areas of the geometry where
that part icular ID is present.
Note: In many instances, you may want to apply
different Lens Effects settings to different pieces
of geometry or ID’s. 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 Effect or Object ID and
proceed.
Unclamped—An unclamped color is br ighter than
pure white (255,255,255). The software keeps
track of these "hot" areas which tend to show
up when your scene contains bright metal lic
highlights or explosions. This spinner lets you
determine the lowest pixel v alue that the Lens
Effect is applied to. Pure white has a pixel value 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 right 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 be 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 a lpha