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604 Chapter 8: Modifiers
nottousetoolargeorsmallvaluesinthisfield.
Very large values w ill interfere w ith 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 will let
Cloth automatically assign a reasonable value for
thickness.
Left:ThetoppieceofclothwithaThicknessof0
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 contact
w ith other cloth objects. Increase this value if there
are a lot of collisions between different parts of
cloth, or if the cloth is tending to interpenetrate.
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.
Air Res.—Resistance to air. This value will
determinehowmuchtheairwilleffectthecloth.A
higher amount of air resistance would be useful for
a tightly woven fabric, while a lower amoun t would
be suitable for a loose-knit garment.
Dyn. Fric.—Dy namic friction between the cloth
and solid objects. A larger value will add more
friction and cause the fabric to slide less across an
object. A lower value will allow the fabric to slip off
an object easily, similarly to how silk would react.
UStretch/VStretch—Resistance to stretching. The
default value of 50.0 is a reasonable value for most
types of cloth. A Larger value will be stiffer, w hi le
asmalleronewillbestretchylikerubber.
By default, the U Stretch and V Stretch parameters
are locked together so that changing one sets the
other to t he same value. You can set different
values for the two only when Anisotropic is off. It is
recommendedtodothisonlyforGarment Maker
(page 1–607) objects.
Static Fric.—Static friction be tween the cloth and
solid objects. When the cloth is in stationary
position, this value will control its ability stay
where it is, or slip away.
Self Fric.—Friction between the cloth and itself.
This is simila r to dynamic and static friction , but
applies to cloth-to-cloth or self-collisions. A larger
value will cause more friction b etween the cloth
and itself.
Shear—Resistance to shearing. Hig her 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 s trait
line this value would represent how long this line
canstretchoutto.Withahighvaluethislengthwill
only be the sum of the length of all of the sides at
rest. A low value will allow this length to be g reater
then that off all of its s ides at rest. This length of