9

Cloth Modifier 599
UB-Curve/VB-Curve—
Resistance to bending as
the fabric folds. The default value of 0 sets the
bend resistance to be constant. A setting of 1
makes the fabric very resistant to b ending as the
angle between tr iang les appro aches 180 deg rees.
You never want two adjacent triangles to pass
through each other , so you can increase this value
to prevent this from happening.
By default, the U B-Curve and V B-Curve
parameters are locked together so that changing
one s ets the other to the same value. You can set
different values for the two only when Anisotropic
is off. It is recommended to do this only for
Garment Maker (page 1–607) objects.
UStretch/VStretch—Resistance to stretching. The
default value of 50.0 is a reasonable value for most
typesofcloth.ALargervaluewillbestiffer,while
a sma ller one w i ll b e stretchy like rubber.
By default, the U Stretch and V Stretch parameters
are locked together so that changing one sets the
other to the same value. You can set different
values for the two only w hen Anisotropic is off. It is
recommended to do this only for Garment Maker
(page 1–607) objects.
Shear—Resistance to shearing. Higher values
result in stiffer cloth fabrics. Shear defines how
much the individual triangles can deform. If you
were to lay the edges of the triangle out in a strait
line this value would represent how long this line
can stretch out to. With a high value this length
will only be the sum of the length of all of the
sides at rest. A low value will allow this length to
be greater then that off all of its sides at rest. This
length of stretched sides is not on a one to one
basis. One side of the polygon may stretch more
then another as long as the total shear value is not
exceeded.
Density —The weight of the cloth per unit area (in
gm/cm2). Higher values mean heavier cloth like
denim. Use smaller values for lig hter cloth like sil k.
Thickness—Defines the virtual thickness of a
fabric for the pur pose of detecting cloth-to-cloth
collisions. This value is irrelevant if cloth-to-cloth
collisions are disabled. Larger values keep the
cloth separated by greater distances. Be careful
not to use too large or small values in this field.
Very large values will interfere with the natural
behavior of the cloth. Very small values will cause
the simulator to take too long to calculate. This
distance is measured in cm (centimeters) and
should be smaller than the size of the triangles that
make up the cloth object. A setting of 0.0 w ill let
Cloth automatically assign a reasonable value for
thickness.
Left: Th e top p iece of cloth with a Thickn ess of 0
Right: Thickness of 9
Repulsion— The amount of force used to repel
other cloth objects. This value is irrelevant
if cloth-to-cloth collisions are disabled. The
simulator will apply a repulsion force scaled by
this value to keep the cloth from coming in con tact
w ith other cloth objects. Increase this value i f there
are a lot of collisions between different parts of
cloth, or if the cloth is tending to interpenetrate.
Dampi ng— The larger this value, is the more
sluggishly the fabric will react. With a lower value,
thefabricwillbehavewithmorespring.Cloth
with more damping will come to rest sooner then
clothwithlessdamping.Highdampingresultsin
cloth that behaves as though it is moving thro ugh
oil. Excessive damping m ay also cause simulation