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506 Chapter 8: Modifiers

shadows will cast shadows from rendered hair.

ForHair’sbufferrendertoconsideronlycertain

spot lights for lighting the hair, select t he lights

you’d l ike Hair to use, and then go to the Hair and

Fur render effect, tur n off “Use all lig hts at render

time” and then click “Add Hair Properties.” This

causes only the designated spot lights to illuminate

the hair. It also adds a

Hair Light Attr rollout (page

2–1196)

to each of the lights that lets you set hair

attributes for the light.

Forbestresults,useaspotlighttoilluminatethe

hair, set the light to cast shadow-mapped shadows,

and m inimize the angle of coverage. If you see

shadowartifactssuchasaliasingandsizzlingin

cast shadows, decrease the spot light angle of

coverage (preferable) or increase the resolution.

This doesn’t mean you can’t ray trace your scene

(unless you’re using mental ray or polygons), but

anything that’s not a spotlight won’t get integrated

into Hair’s buffer render ca lculations.

Loadi ng a nd S avi ng

TheHairdatainyoursceneisautomaticallysaved

when you save your MAX scene file. The state data

for the hair can consume quite a bit of space, so

yourscenefilewillprobablybesignificantlylarger

than it was before you applied hair.

Animating Hair

WhiletheStyledialogletsyoumovehairguides

around, you cannot keyframe this movement. You

can, of course, keyframe Modif y panel parameters

to simulate special effects such as hair growing. But

to animate hair motion, you can take advantage

of the internal Hair > Frizz Anim parameters,

use dynamics (including gravity), apply external

forces, or employ any combination of the three.

To a n i m a te f r i z z , u s e t h e

Frizz Anim

, Anim Speed,

and Frizz Anim Dir p arameters. It’s not necessary

to keyfra me these to create animation; just set

them to values other than the defaults.

The remaining animation solutions are available

on the

Dynamics rollout (page 1–522)

.Youcan

find a procedure that shows basic dynamics hair

simulation

here (page 1–508)

Hai r and Fur M odifier

Modify panel > Make a selection. > Modifier List >

World-Space Modifiers > Hair and Fur

The Hair a nd Fur mod ifier is t he hear t of the Hair

and Fur system. You apply it to any object that

you want to grow hair from; either a mesh object

or a spline object. If it’s a mesh object, the hair

growsfromtheentiresurfaceunlessyoumakea

sub-object selection. If applied to a spline object,

the hair grows between the splines.

With splines, it’s important to ma ke sure that the

splines are in sequential numerical order, because

that’s the order Hair uses to determine adjacent

guides. To check the numerical order, go to the

Editable Spline level of the modifier stack and

access the Spline sub-object level. Then click each

spline in turn and check its ID number at the

bottom of the Selection rollout. Also, make sure

that each spline’s first vertex is where the hair roots

should be.

Note: To select a Hair and Fur-modified object,

click the object. The hair itself as displayed in the

viewportsisnotselectable.