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1331

Anisotropic Shader 1321

over. Generally, sliding friction is lower than

static friction due to surface tension effects. For

example, once steel starts sliding over brass (a

value of static friction that might run from 0.05 to

0.2), the sliding frict ion drops to a sig nificantly

lower value, on the order of .01 to 0.1. For some

materials, such as specific friction materials like

brake linings, sliding fr iction is just as high as static

friction because it is used in conjunction with

a nearly f rict ionless m aterial such as harde ned

polished steel.

Basic Material Shaders

Anisotropic Shader

Material Editor > Standard material > Shader Basic

Parameters rollout > Anisotropic shader > Anisotropic

Basic Parameters rollout

TheAnisotropicshadercreatessurfaceswith

elliptical, "anisotropic" highlights. These

highlights are good for modeling hair, glass, or

brushed metal. The basic parameters are similar to

those for

Blinn or Phong shading (page 2–1321)

except for the Specular Highlight parameters,

and Diffuse Level controls such as those for

Oren-Nayar-Blinn shading (page 2–1323)

Anisotropic highlig hts are elliptical, with differing U and V

dimensions.

Anisotropy measures the difference between sizes

of the highlight as seen from two perpendicular

directions. When anisotropy is 0, there is no

difference at all. The hig hlight is circular, as in

Blinn or Phong shading. When anisotropy is 100,

thedifferenceisatitsmaximum.Inonedirection

the highlight is very sharp; in the other direction it

is controlled solely by Glossiness.

For more complex high lights, see the

Multi-Layer

shader (page 2–1323)