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1706 Chapter 16: Material Editor, Materials, and Maps
basis, or provide an environment to specified
objectswhenthesceneasawholehasnone.
Raytraced R eflection an d Refraction 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 tur n on antialiasing
globally, choose Rendering > Raytrace Globals to
display the Global Raytracer Settings dialog (page
2–1528).
On—When on, uses antialiasing.
Default=unavailable unless global antialiasing is
turned on; on if global antialiasing is turned on.
Drop-down list—Chooses which antialiasing
settings to use. There are three alternatives:
•
Use Global Antialiasing Settings—(The default.)
Uses the global antialiasing settings.
•
Fa st Adaptive Antialiaser —Uses the Fast
Adaptive antialiaser, regardless of the global
setting.
•
Multiresolution Adaptive Antialiaser—Uses the
Multiresolution Adaptive antialiaser, regard less
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 Antia lia sing S ettings—Clicking ...
displays the Global Raytracer Settings dialog
(page 2–1528).
•
Fa st Adaptive A ntialiaser—Clicking ... displays
theFastAdaptiveAntialiaserdialog (page
2–1533).
•
Multiresolution Adaptive A ntialiaser—Clicking
... displays the Multiresolution Adaptive
Antialiaser dialog (page 2–1534).
When you change settings for an antialiaser
locally, you don’t affect the global settings for that
antialiaser.
R ay tra ce: A ttenuation R ollout
Material Editor > Maps rollout > C lick a Map button. >
Material/M ap Browser > Raytrace > Attenuation Rollout
When a r ay is reflected off an object or refracted
through it, by default the ray travels through space
forever , with no attenuation (page 3–912).The
cont rols in this rollout allow you to attenuate rays,
so their strength diminishes over distance.
In the Raytrace map (page 2–1698),attenuation
is implemented by a clipping algorithm. Objects
beyond the maximum attenuation r ange aren’t
even considered by the ray tracer. Because of this,
assigning attenuation can 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.