8

Diffuse R oughness Mapping 1341
rollout. When the Amount is 0 percent, the map
isn’t used at all.
Procedure
To ma p the diff use level v al ue:
1.
Click the Map button for Diffuse Level.
The
Material/Map Browser (page 2–1291) is
displayed.
2. Choose from the list of map types, and then
click OK.
TheMaterialEditorisnowatthemaplevel,and
displays controls for the map parameters.
3. Use the map controls to set up the map.
Diffuse R oughness Ma pping
Material Editor > Standard material > Shader Basic
Parameters rollout > Oren -Nayar-Blinn or Multi-Level
shader > Maps rollout > Diff. Roughness button
Yo u c a n s e l e c t a b i t m a p f i l e o r procedural map
(page 3–1091)
to control the Roughness parameter
on the Basic Pa rameters rollout. White pixels
in the map increase roughness. Black pixels
reduce roughness to 0. Intermediate values adjust
roughness accordingly.
Note: The Roughness parameter is available only
w ith the
Oren-Nayar-Blinn (page 2–1323) and
Multi-Level (page 2–1323) shaders.
Reducing the Amount of the Diffuse Roughness
map reduces the map’s effect, and increases
the effect of the Roughness value on the Basic
Parameters rollout. When the Amount is 0
percent, the map isn’ t used at all.
Procedure
To map the r oughness va lue:
1.
Click the Map button for Diffuse Roughness
(Diff. Roughness).
The
Material/Map Browser (page 2–1291) is
displayed.
2. Choose from the list of map types, and then
click OK.
TheMaterialEditorisnowatthemaplevel,and
displays controls for the map parameters.
3. Usethemapcontrolstosetupthemap.
Specular Color Mapping
Material Editor > Standard material > Maps rollout >
Specular button
Mapping the specular highlight
Yo u c a n s e l e c t a b i t m a p f i l e o r procedural map
(page 3–1091)
to apply an image to the material’s
specular color component (page 3–1108) .The
map’simageappearsonlyinthespecularhighlight
areas.
When the amount spinner is at 100, all specular
color is provided by the map.
Specular mapping is used primarily for special
effectssuchasplacinganimageinareflection.
The important thing to remember is that, unlike
Specular Level or Glossiness mapping, which alter
the
intensity and location of specular highlights,
specular mapping alters the
color of specular
highlights.