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1242 Chapter 14: character studio
perpendicular to the surface of the object to which
the field is applied; if necessary, you can smooth
them out with a blending function. The crowd
members move around the object by traveling
perpendicular to the vectors.
Yo u c a n u s e t h e v e c t o r f i e l d a s a Space Warp
behavior (page 2–1221),asthesourceobjectforan
Avoid behavior (page 2–1211), or both. When used
together, delegates slow down when they approach
a complex object, and then go around it. This
guarantees that delegates will not pass through the
obstacle’s surface.
The vector field includes sett ings for strength,
falloff, and a push/pull effect, as well as options
to display the lattice, the effective range, and the
vectors.
The Vector Field space warp provides these
rollouts:
Create Method Rollout (page 2–1242)
Lattice Parameters Rollout (page 2–1242)
Obstacle Parameters Rollout (page 2–1242)
Create M ethod R ol lout
Create panel > Space Warps > Par ticles & Dynamics >
Object Type rollout > Vector Field > Create M e thod rollout
The Create Method rollout for the Vector Field
space warp lets you specify whether to create the
vectorfieldusingthecubeorboxmethod.
Inter face
Cube—Forces length, w idth, and height to be
equal.
Creating a cube-shaped space warp is a one-step
operation. Starting at the center of the cube,
drag in a viewport to set all three dimensions
simultaneously. You can change the individu al
dimensions in the Lattice Parameters rollout.
Box—Creates a standard box-shaped space war p
from one corner to the diagonally opposite corner,
w ith different sett ing s for leng th, width, and
height.
Lattice Parameters Rollout
Create panel > Space Warps > Particles & Dynamics >
Object Type rollout > Vector Field > Lattice Parameters
rollout
Selec t a Vector Field space warp. > Modify panel > Lattice
Parameters rollout
Use these parameters to specify the Vector Field
lattice size and number of segments.
Interfa ce
Length/Width/Height—Specify the dimensions of
thelattice. Thelatticeshouldbelargerthanthe
Ve c tor F i e l d o b j e c t .
Length Segs/W idth S egs/Height S egs—Specify the
resolution of the Vector Field lattice. The greater
the resolution, the higher the accuracy of the
simulation.
Obsta cl e Pa r ameters R ollout
Create panel > Space Warps > Particles & Dynamics >
Object Type rollout > Vector Field > Obstacle Parameters
rollout
Selec t a Vector Field space warp. > Modify panel >
Obstacle Parameters ro llout
A vector field (page 2–1241), generated around
an obstacle object,allowscrowd (page 2–1187)
members to avoid that object in a scene. The field
consists of a three-dimensional arra y of vectors
which guide delegates or other objects around
theobstacle. Thesettingsinthisrollouthelp
determinehowthevectorsaregeneratedand
displayed, and how they affect other objects.