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Raytrace Material 1353
mapping of an editable mesh can cause problems
because of the way the underlying mesh is
tessellated. (These problems don’t occur when
you apply displacement mapping to a NURBS
surface.) When this happens, smoothing does not
work properly and you can see the underlying
wireframemeshinthesurfaceitself.Tocorrect
this problem, use these techniques:
• Avoid applying displacement mapping to large
areas of a single color. Map the diffuse color
and use a small amount of var iation, such as
slight amount of noise, in the map y ou use for
the diffuse color.
• Add a small amount of noise to the map you
use for displacement. This can complicate the
tessellation enough to ease the problem.
• Add detail to the mesh. The more initial faces,
and the smoother the mesh curvature, the more
even the displacement mapping will be.
Pr ocedur es
To apply a displacement map to a NURBS surface,
editable mesh, or patch:
1.
In a material’s Maps rollout, click the map
button for Displacement.
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.
To a pply a dis pla cement ma p to other k inds of
obj ects :
1.
Select the object. Go to the Modif y panel
and choose Disp Approx from the Modifiers
drop-down list.
You can adjust the Disp Approx modifie rs
parameters, or you can leave them at their
default settings.
2. Go to the Material Editor.
3. In a material’s Maps rollout, click the map
button for Displacement.
The
Material/Map Browser (page 2–1291) is
displayed.
4. Choose from the list of map types, and then
click OK.
TheMaterialEditorisnowatthemaplevel,and
displays controls for the map parameters.
5. Usethemapcontrolstosetupthemap.
For example, if you chose Bitmap as the map
type, you now need to select the bitmap file
to use.
Raytrace Material
Material Editor > Type button > Material/Map Browser >
Raytrace
Balls using raytrace material to reflect each other
Raytrace material is an advanced surface shading
material. Itsupportsthesamekindsofdiffuse