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536 Chapter 8: Modifiers
Note:
Thedefaultsizeofthehairsdependsonthe
sizeoftheobjecttowhichthemodifierisapplied.
Thelargertheobject,thegreatertheinitialsize.
Cut Length—The numeric va lue sets the overall
hair leng th as a percentage multiplier of the Scale
value. D efault=100.0. Range=0.0 to 100.0.
Thisattributeisalsomappableviathemapbutton
totherightofthespinner. Mappingallowsyou
to add a texture map to control the length of the
hair. An area of the map whose gray value is 50%
w ill cut the hair grown in that area to 50% of its
original length, with no shape change.
This parameter is more computationally
expensive than a density map, since each curve
is re-parameterized on the fly, and should not
be confused with a density map. It’s really more
useful as an animated effect for g rowing hair (for
example, creating a wolfman character).
Rand. Scale—Introduces random scaling into the
rendered hairs. Default=40.0. Range=0.0 to 100.0.
Random Scale value ramped from 0.0 (left) to 100.0 (right)
using a linear gradient map
At the default value of 40.0, 40 percent of t he hairs
are scaled down randomly by varying amounts. At
0.0, no random scaling is introduced.
Root Thick —Cont rols the thickness of the hair at its
root. With insta nced hair, this controls the overall
thickness as a multiplier of the original object’s
dimensions on the X and Y axes in object space.
This setting affects both native hair and instanced
hair. With instanced hair, Root thick controls the
overall thickness of the hair, not just at the root.
Tip Thick —Controls the thickness of the hair at its
tip.
This setting affects native hair only, not instanced
hair. To create tapering in instanced hair, apply the
tapering when modeling the object to be instanced
within Hair.
Top: Root Thick=10.0, Tip Thick=0.0
Bottom: Tip Thick=10.0, Root Thick=0.0
Hair is translucent if its width is less than one pixel.
Thin hair that rendered as opaque in previous
versions of the software might give unexpected
results when rendered in this version. On the other
hand, setting Root Thick and Tip Thick to small
values (close to or less than 1.0) can be a good way
to obtain translucent hair.
Displa cement—Displacesthehairrootsfrom
the sur face of t he grow th object. Default=0.0.
Range=–999999.0 to 999999.0.
When you render an object w ith a high polygon
count, but use a low-polygon proxy object to grow
the hair, adjusting Displacement can help make the
hair seem to grow from the high-polygon object,
rather than floating above it.
Anotheruseforthissettingcanbeanimatingthe
hair falling onto or moving away from the growth
object.
Interpolate—When on, hair growth is interpolated
among the guide hairs, and the surface is fu lly
populated with hair according to the General
Parameters settings. When off, Hair generates
only one hair per triangular face on the growth