9

Hair and Fur Render Effect 221
Inter face
Hair R en d erin g Options group
Hair s—Sets the method to be used for rendering
hair:
•
buf f er —(The default.) Procedural hair
generatedbyHairatrendertimebasedonthe
modifier parameters. Buffer hair is generated
by a special renderer within Hair and offers the
benefit of being able to create millions of hairs
with minimal memory requirements. Only one
hair is in memory at a time. Also, using Buffer
render offers a variety of compositing options
(described below).
•
geome try—Creates act ual geometr y for the
rendered hair at render time. This geometry is
assigned the material ID set by the Hair And
Furmodifier>Geom Mat ID parameter.
Note: “Geometry” hair derives its texture from
the grow t h object, not from any maps applied
via the Material Parameters rollout.
Compositing options aren’t available with
“geometry” hair.
The “geometry” option works with both the
defaultscanlinerendererandthementalray
renderer.
•
mr prim —Hair is generated by a procedural
mental ray shader that generates mental ray
curve primitives directly into the mental ray
rendering stream at render time.
Choose this option only when you are rendering
hair with the mental ray renderer (page 3–78).
mr V oxel Reso l ut io n—Available only for the
“geometry” and “mr prim” Hairs options. At
render time, hair boundaries are subdivided into
volumecubesor“voxels.”3dsMaxcalculates
which hairs are in each voxel, and w hen a ray enters
avoxel,itcalculatesforthosehairs.Thisallows
unneeded voxels to be removed from memory
during calculation.
With “geometry” rendering, voxels are used only
for calculating instanced hairs.
This value gives the resolution of the subdivision.
Forexample,avalueof3subdividesthevolume
into3x3x3voxels,foratotalof27.Thehigher
this value, the more efficient calculations can be.
Default=5.
Lighting—
• native—(The default.) Uses standard 3ds Max
calculations for lig ht fal loff.
•
emul a t ion —Per forms a simpler interna l
calculation for light falloff within the buff er
render. It applies only to the buffer hair