9

1490 Chapter 16: Material Editor, Materials, and Maps
Inter face
Diff use Level—Increasing this value increases
diffuse brig htness, and decreasing it reduces
diffusebrightnesswithoutaffectingthespecular
highlight. You can increase the diff use level over
and above the diffuse color’s Value (in its HSV
description (page 3–1001)). This parameter can
range f rom 0 to 400. Default=100.
Clickthemapbuttontoassignamaptothediffuse
level parameter. See Diffuse Level Mapping (page
2–1499).Thisbuttonisashortcut:youcanalso
assign diffuse level mapping in the Maps rollout
(page 2–1474).
R oughness
Material Editor > Standard material > Multi-Layer or
Oren-Nayar-Blinn Basic Parameters rollout > Advanced
Diffuse group (unlabeled for Multi-Layer)
Roughness controls how quickly the diffuse
component blends into the ambient component.
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).
Increasing the blending area bet ween diffuse and ambient
with Roughness
Procedure
To adjust the roughness:
• Change the value of Roughness.
Increasing roughness makes the material have a
flatter, more matte appearance.
Interfa ce
Roughness —As you increase this value, the matte
appearance of the material increases. It also
grows d arker and appears more flat. At 0, the
roughness is the same as it is with Blinn shading
(page 2–1480). Default=50.
Clickthemapbuttontoassignamapto
Roughness. This button is a shortcut: you can
also assign Diff use Roughness mapping in the
Maps rollout (page 2–1474).SeeDiffuse Roughness
Mapping (page 2–1500).