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1500 Chapter 16: Material Editor, Materials, and Maps
rollout. When the Amount is 0 percent, the map
isn’t used at all.
Procedure
To ma p the di ff use lev el va lue:
1.
Click the Map button for Diffuse Level.
The Material/Map Browser (page 2–1447) is
displayed.
2. Choose from the list of map types, and then
click OK.
TheMaterialEditorisnowatthemaplevel,and
displays controls for t he m ap parameters.
3. Use the map controls to set up the map.
Diffuse R oughness Mapping
Material Editor > Standard material > Shader Basic
Parameters rollout > Oren-Nayar-Blinn or Multi-Level
shader > Maps rollout > D iff. 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 3–997) to control the Roughness parameter
on the Basic Parameters 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 O ren-Nayar-Blinn (page 2–1482) and
Multi-Level (page 2–1481) shaders, and with
the Arch & Design material (mental ray) (page
2–1549).
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 ma p the roughness val ue:
1.
Click the Map button for Diffuse Roughness
(Diff. Roughness).
The Material/Map Browser (page 2–1447) is
displayed.
2. Choose f rom the list of map types, and then
click OK.
TheMaterialEditorisnowatthemaplevel,and
displays controls for the map parameters.
3. Usethemapcontrolstosetupthemap.
Specular Color Mapping
Material Editor > Stand ard 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 3–997) to apply an image to the material’s
specular color component (page 3–1014).Themap’s
image appears only in the specular highlig ht areas.
When the amount spinner is at 100, al l specular
color is provided by the map.
Specular mapping is used primarily for special
effectssuchasplacinganimageinareflection.
The important thing to remember is that, unlike