8

Raytrace Basic Parameters Rollout 1359
Specular Highlight group
Thecontrolsinthisgroupaffecttheappearanceof
specular highlights. Specular hig h lights simulate
the surface of the raytraced object reflecting the
lights in the scene. Changing the color or intensity
of lights in the scene can change the appearance
of specular highlights.
As in standard materials, as you adjust the values
in this group the highlight curve at the right
changes to give you an idea of the effect. The
material preview in the sample slot also updates.
Specular Color —Sets the specular color (page
3–1108)
, assuming there are white lights in the
scene.
Click the color swatch to display the
Color Selector
(page 1–157)
and change t he high light color.
Clickthemapbuttontoassignamaptothe
specular color. See
Specular Mapping (page
2–1341)
.Thisbuttonisashortcut:youcanalso
assign specular level mapping in t he
Raytrace
Maps rollout (page 2–1364)
.
The remaining controls in the Specular Highlight
group depend on the active shader, as shown next
to “Shading:” at the top of this rollout. These
highlight controls are the same as for the Standard
mater ial shaders.
Thesearethehighlightcontrolsavailableto
Raytrace materials:
•
Anisotropic highli g hts (page 2–1333)
• Blinn, Oren-Nayar-Blinn, and Phong highlights
(page 2–1334)
• Metal highlights (page 2–1335)
Note: Highlight controls that don’t pertain to
the current shader are labeled “N/A.”
Environment—Specifies an environment map that
overrides the global environment map. Both
Reflect and Transparency use the scene-wide
environment map unless you use this button to
specify another map. With this control, you can
use different environment maps on a per-object
basis, or provide an environment to specified
objects when the scene as a whole has none.
This m ap overrides the scene-wide envi ronment
for both reflection and refraction. To override
for refraction alone, see the Transparency
Environment control in the Extended Parameters
rollout.
Use the check b ox to turn this map on or off.
Tip: Yo u c a n u s e a n y m a p a s t h e R a y t r a c e
environment, including the
Reflect/Refract
(page 2–1509)
map. Reflect/Refract map is often
adequate for getting the required look, and it
usually renders more quickly than ray tracing the
entire scene, especially if the Raytrace material is
transparent. If you are using Raytrace material just
to get the glass to look right on a car’s headlight or
onalightbulbhanginginthemiddleofaroom,
turn off the raytracer and use an environment map
instead.
Lock button—Locks the Env ironment map to the
Transparency Environment map (found on the
Extended Parameters rollout (page 2–1360) ).
When on, the Transparency Environment map
controls are disabled, and a map applied to the
Raytrace Environment applies to the Transparency
Environment as well. When off, the Transparency
Environment map controls are enabled, and the
Transparency Environment can have a different
map assigned to it. Default=on.
Changing this button’s setting here also changes it
on the
Extended Parameters rollout (page 2–1360)
and the Maps rollout (page 2–1364) .
Bump—This is the same as bump mapping (page
2–1347)
for Standard materials. Click the button
to assign the map. Use the spinner to change the
bump Amount. Use the check box to turn the map
on or off.