8

1516 Chapter 16: Material Editor, Materials, and Maps
basis, or provide an environment to specified
objectswhenthesceneasawholehasnone.
Raytraced R e fle ction and Refrac tion Antialiaser
group
Controls in this group let you override the global
antialiasing sett ings for raytraced maps and
materials. They are unavailable if antialiasing
is turned off globally. To turn on antialiasing
globally, choose Rendering > Raytrace Globals to
display the
Global Rayt racer Settings dialog (page
2–1369)
.
On—When on, uses antialiasing.
Default=unavailable unless global antialiasing is
turned on; on if g lobal antialiasing is turned on.
Drop-down list—Chooses which antialiasing
settings to use. There are three alternatives:
•
Use Global Antialiasing S ettings—(The default.)
Uses the global antialiasing settings.
•
Fa st Adaptive Antialiaser—Uses the Fast
Adaptive antialiaser, regardless of the g lobal
setting.
•
Multiresolution Adaptive Antialiaser—Uses the
Multiresolution Adapt ive antialiaser, regardless
of the global setting.
...—The button with the ellipsis to the right of
the drop-down list displays another dialog to let
you set antialiasing controls locally. The dialog
displayed depends on which alternative you chose
in the drop-down list, as follows:
•
Use Globa l A ntiali asing Settings—Clicking ...
displays the
Global Raytracer Settings dialog
(page 2–1369)
.
•
Fa st Adaptive Antialiaser —Clicking ... displays
theFastAdaptiveAntialiaser
dialog (page
2–1374)
.
•
Multiresolution Adaptive Antialiaser—Clicking
... displays the
Multiresolution Adaptive
Antialiaser dialog (page 2–1375)
.
When you change settings for an antialiaser
locally, you don’t affect the global settings for that
antialiaser.
R ay tra ce: Attenua tion R ollout
Material Editor > Maps rollout > Click a Map button. >
Material/M ap Browser > Raytrace > Attenuation Rollout
When a ray is reflected off an object or refrac ted
through it, by default t he ray travels through space
forever, with no
attenuation (page 3–1006) .The
cont rols in this rollout allow you to attenuate rays,
so their strength diminishes over distance.
In the
Raytrace map (p age 2–1508) ,attenuation
is implemented by a clipping algorithm. Objects
beyond the maximum attenuation range aren’t
even considered by the raytracer. Because of this,
assigning attenuation c an speed up rendering
time.
Interfa ce
Fa lloff Type—Choose the falloff to use.
•
Off—Turns off attenuation. (Default.)
•
Linear—Sets linear attenuation. Linear
attenuation is calculated between the start and
end range values.