9
1504 Chapter 16: Material Editor, Materials, and Maps
The filter, or transmissive color, is the
color transmitted through transparent or
semi-transparent materials such as glass.
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 map the filter color component.
This map applies a transparent-color effect based
on the intensity of the map’s pixels.
You can combine a mapped filter color w ith
volumetr ic lighting (page 3–288) to create effects
such as colored light through a stained-glass
window. Ray-traced shadows (page 3–1000) cast
by tr ansparent objects are tinted by the filter color.
(In version 1 and 2, you specified the filter color
on the Basic Parameters rollout (page 2–1470).As
of version 3, the filter color is specified on the
Extended Parameters rollout (page 2–1471).)
Procedure
To map the filter color:
1.
Click the Map button for Filter color.
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.
Anisotropy Mapping
Material Editor > Sta ndard material > Shader Basic
Parameters rollout > Anisotropic or Multi-Level s hader >
Maps rollout > Anisotropy button
Mapping anisotropy. The stretch of the highlight depends on
the level of gray in the map.
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 Anisotropy parameter.
Themapcontrolstheshapeoftheanisotropic
highlight, roughly (but not necessarily) w ithin the
area specified by the glossiness parameter. Black
and white va lues have little effect. Maps with a
good deal of grayscale values, such as Noise (page
2–1674) or Falloff (page 2–1670),canbevery
effective.
The anisotropy parameter is available with the
Anisotropic (page 2–1480) and Multi-Level (page
2–1481) shaders.
The effect of mapping anisotropy is not very
apparent unless the specular level is fairly high and
glossiness is fairly low.
Reducing the Amount of the anisotropy map
reduces the map’s effect, and increases the effect
of the Anisotropy value on the Basic Parameters
rollout. When the Amount is 0 percent, the map
isn’tusedatall.