8

514 Chapter 8: Modifiers
themapwhosegrayvalueis50%willreducethe
amount of hair grown in that area by 50%. To
change t he overall hair count, use t he Hair Count
value (see above).
Tip: For optimal efficiency, use the Hair Count
valuetosettheactualnumberofhairs,leave
Density at 100.0, and use the mapping facility to
create uneven hair distr ibution if necessary. Simply
loweringtheDensityvaluewithoutspecifyinga
map causes hairs to be created and then discarded,
increasing rendering time unnecessarily.
Scale—Sets the overall scaling for the hairs.
Default=100.0. Range=0.0 to 100.0.
At the default value of 100.0, the hairs are full size.
Reduce this value to make the hairs smaller. To
make the hairs larger, use the
styling tools (page
1–524)
. Default=100.0. Range=0.0 to 100.0.
Scale value ramped from 0.0 (lef t ) to 100.0 (ri ght) using a
linear gradient map
Note: Thedefaultsizeofthehairsdependsonthe
sizeoftheobjecttowhichthemodifierisapplied.
Thelargertheobject,thegreatertheinitialsize.
Cut LengthThe numeric value sets the overall
hair length as a percentage multiplier of t he Scale
value. Default=100.0. Range=0.0 to 100.0.
Thisattributeisalsomappableviathemapbutton
to the rig ht of the spinner. It al lows you to add a
texture map to control the length of the hair . An
areaofthemapwhosegrayvalueis50%willcut
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 . I ts really more
useful as an animated effec t for growing hair (for
example, creating a wolfman character).
Rand ScaleIntroduces random sca ling into the
rendered hairs. D efault=40.0. Range=0.0 to 100.0.
Rand 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 the hairs
are sca led down randomly by varying amounts. At
0.0, no random scaling is introduced.
Root Thi ck—Controls the thickness of the hair at its
root. With instanced hai r, this controls the overall
thicknessasamultiplieroftheoriginalobjects
dimensions on the X and Y axes in object space.
This s etting affects both native hair and inst anced
hair. With instanced hair, Root thick controls the
overall thick ness of the hair, not just at the root.
Tip Thick—Controls the thick ness 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.