9
Blinn, Oren-Nayar-Blinn, and Phong Highlights 1493
(page 2–1502). This button is a shortcut: you can
also assign specular level mapping in the Maps
rollout (page 2–1474).
Anisotropy —Controls the anisotropy, or shape, of
the h ighlight. At 0, the highlight is round. At 100,
the h ighlight is extremely narrow. One axis of the
Highlight g raph changes to show changes in this
parameter. Default=50.
Orientation—Changes the orientation of the
highlight. The sample slot shows changes in
orientation. This is a value in degrees that can
range f rom 0 to 9,999. Default=0.
Highli ght gra ph—These two intersecting curves
showtheeffectofadjustingthevaluesofSpecular
Level, Glossiness, and Anisotropy. As you decrease
Glossiness, the curves grow wider; as you increase
Specular Level, the curves grow ta l ler. As you
adjust Anisotropy, the white curve changes to
show how wide or narrow the highlight is.
B linn, Or en-Nay ar -Bl inn, a nd
Phong Highlights
Material Editor > S tanda rd mate r ial > Bl inn,
Oren-Nayar-Blinn, or Phong Basic Parameters rollout >
Specular Highlight group
Material Editor > Raytrace m aterial > Raytrace Basic
Parameters rollout > Shading: Blinn, Oren-Nayar-Blinn, or
Phong > Specular Highlight group
The Blinn (page 2–1480), Oren-Nayar-Blinn (page
2–1482),andPhong (page 2–1482) shaders all have
circular highlights and share the same h ighlight
controls. Blinn and Oren-Nayar-Blinn hig hlights
are somewhat softer and rounder than P hong
high lights.
Note: For the Raytrace material (page 2–1512),the
Specular Color component appears in the Specular
Highlight group. Also, highlight controls that don’t
pertain to the current shader are labeled “N/A.”
Procedures
To increa se or decrease the s trengt h of a hi ghlight:
• Change the value of Specular Level.
The intensity of the Highlight curve and the
highlight in the preview change. At 0% specular
level, there is no highlight. At 100% specular
level, the curve is at its maximum height w ith no
overloading. At values g reater than 100%, the
curve is overloaded: it grows wider, and a wider
area is at the maximum highlight intensity.
TheshapeoftheHighlightcurveaffectsthe
blending between the specular and diffuse color
regions of the material. The steeper the curve,
the less blend ing there is and the sharper the
edge of the specular highlig ht.
To increase or decrease the size of a highlight:
• Change the Glossiness value.
The width of the Highlight curve and t he
highlight in the preview change. At 0%
glossiness, the curve is at its max imum width.
At 100% glossiness, the curve is extremely
narrow.
Interfa ce
Specular Level—Affects the intensity of the specular
highlight. As you increase the value, the highlight
grows brighter. Default=5.
Clickthemapbuttontoassignamaptothe
specular level component. See Specular Level
Mapping (page 2–1502).Thisbuttonisashortcut:
you c an a lso assign specular level mapping in the
Maps rollout (page 2–1474).
Glossines s—Affe cts t he size of the specu lar
highlight. As you increase the value, the highlight