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584 Chapter 8: Modifiers
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 wil l apply a repulsion force sca led 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 v alue of 0 sets the
bend resistance to be constant. A setting of 1
makes the fabric ver y resistant to bending as the
angle between triangles approaches 180 degrees.
You never want two adjacent triang les 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 lo cked together so that changing
one sets 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 1–587) objects.
Air R es.—Resistance to air. This value will
determine how much the air will effect the cloth. A
higher amount of air resistance would be useful for
a tightly woven fabric, while a lower amount would
be suitable for a loose-knit garment.
Dyn. Fric.—Dy namic friction between the cloth
and solid objects. A larger va lue will add more
friction and cause the fabric to slide less across an
object. A lower v alue will allow the fabric to slip off
an object easily, similarly to how silk would react.
UStretch/VStretch—Resistance to stretching. The
default va lue of 50.0 is a reasonable value for most
types of cloth. A Larger value will be stiffer, while
asmalleronewillbestretchylikerubber.
By default, the U Stretch and V Stretch parameters
are locked together so that changing one sets the
other to the same value. You c an set different
values for the two only when
Anisotropic is off.
Itisrecommendedtodothisonlyfor
Garment
Maker (page 1–587)
objects.
Static Fric. —Static frict ion between the cloth and
solid objects. When the cloth is in stationary
position, this v alue wil l control its ability stay
where it is, or slip away.
Self Fric.—Friction between the cloth and itself.
This is similar to dynamic and static friction, but
applies to cloth-to-cloth or self-collisions. A larger
value will cause more friction between the cloth
and itself.
Shear—Resistance to shearing . Higher values
result in stiffer c loth fabrics. Shear defines how
much the individual triangles can deform. If you
were to lay the edges of the triangle out in a st rait
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 w ill 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
Seam Force—Not presently used and
only kept for backward compatibility with older
versions of the former product, called Stitch. This
was a global seam st rength, but seam strength is