8
Hair and Fur Modifier 523
Hair adds a four-digit frame number (with leading
zeroes)andthefilenameextension“.stat”tothe
name you provide (e.g.,
hair_test0001.stat
).
Delete all files—Deletesanystatfileswiththeprefix
you defined from the target directory.
Tip: You can stil l u se stat files even if you move
them to another location. Follow this procedure:
1. Open the MAX file used to generate the stat
files.
2. On the Modify panel > Dynamics rollout, click
the ... [ellipsis] button.
3. Use the Save As dialog to navigate to the
directory with t he stat files, and then click any
stat file. Its name appears in the File Name field.
4. EdittheFileNamefieldtodeletethefour-digit
extension after the stat file name. For example,
if the stat file name is
test0033.stat
,deletethe
“0033” so that it reads
test.stat
.
5. Click the Save button. The new stat f ile path
appearsintheStatFilesfield.
Now,whenyouplayorrendertheanimation,Hair
uses the stat files as original ly generated.
Simulation group
Determines the extent of t he simulation, and lets
you run it. The controls become available only
after setting Stat Files (see above). Set Start and
Endtotheframesatwhichtobeginandendthe
simulation, and then click the Run button. The
software then computes the dynamics and saves
the stat files.
Start—The first frame to consider in calculating
the simulation.
End—The final frame to consider in calculating
the simulation.
Run—Activates the simulation and generates the
stat files within the frame r ange indicated by Start
and End.
To abort a simulation while it ’s running, click
Cancel on the status bar.
Dynamics Params group
Grav ity —Lets you specify a force that moves hair
ver t ically in world space. Negative values pull hair
upwhilepositivevaluespullitdown.Tocausehair
not to be affected by gr avity, set the v alue to 0.0.
Default=1.0. Range=-999.0 to 999.0.
Stiffness—Controls the magnitude of the effect of
dynamics. If you set Stiffness to 1.0, the dynamics
will have no effect. Default=0.4. Range=0.0 to 1.0.
Root Hol d—Comparable to stiffness, but affects the
hair only at the roots. Default=1.0. Range=0.0 to
1.0.
Dampen—Dynamic hair carries velocity forward
to the next frame. Increasing dampening
increases the amount by which these velocities are
diminished. Thus, a higher Dampen va lue means
that hair dynamics will b e less active (the hair can
also start to get “floaty”). Default=0.0. Range=0.0
to 1.0.
Collisions group
Use these sett ings to determine which objects hair
collides with during a dynamic simulation and the
method by which collision is calculated.
[collision method]—
• None: Collisions are not considered during the
dynamic simulation. T his can cause the hair
to penetrate its g row th object as well as other
objectsitcomesintocontactwith.
• Sph ere : Hair uses a spherical bounding box
to calculate collisions. This metho d is faster
because it requires less computation, but can
cause inaccurate results. It’s most effective
when the hair is seen from a distance.