8

Roughness 1331
Adjusting diffuse level
Procedure
To adjust the diffuse level:
• ChangethevalueofDiffuseLevel.
The material grows lighter or darker. Lowering
the Diffuse Level dims the material’s diffuse
color without affecting the sp ecular highlight.
Diffuse Level is intended pr imar i ly so you can
create a
map (page 2–1340) that makes portions
of the material very dark.
Inter face
Diff use Level—Increasing this value increases
diffuse brightness, and decreasing it reduces
diffusebrightnesswithoutaffectingthespecular
highlight. You can increase the diffuse level over
and above the diff use color’s Value (in its
HSV
description (page 3–1095)
). This parameter can
range from 0 to 400. Default=100.
Clickthemapbuttontoassignamaptothediffuse
level p ar ameter. See
Diffuse Level Mapping (page
2–1340)
.Thisbuttonisashortcut:youcanalso
assign diffuse level mapping i n the
Maps rollout
(page 2–1315)
.
R oughness
Material Editor > Standard material > Multi-Layer or
Oren-Nayar-Blinn Basic Parameters rollout > Advanced
Diffuse group (unlabeled for Multi-Layer)
Roughnesscontrolshowquicklythediffuse
component blends into the ambient component.
Note: Only the Multi-L ayer (page 2–1323) and
Oren-Nayar-Blinn (page 2–1323) shaders h ave
roughness.
Increasing the blending area between 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 m aterial increases. It a lso g rows
darker and appears more flat. At 0, the roughness
isthesameasitiswith
Blinn shading (page
2–1321)
. Default=50.