You can generate a
force field from your nParticle object that either pushes or pulls
nCloth objects or other nParticle objects away from or toward your nParticles.
Positive Point Field Magnitude values
produce a force that pushes Nucleus objects away, while negative Point
Field Magnitude values generate a force that pulls objects
towards the nParticles. The active area or region of the force field
is defined by a Point Field Distance attribute.
You can use the Point Field Scale ramp to control
how Point Field Magnitude is distributed along
the area defined by Point Field Distance.
nParticle objects can
also generate a Self Attract force. By adjusting Self Attract,
an nParticle object’s individual particles can be made to attract
or repel each other.
To generate a force field for an nParticle
object
- Select the nParticle object that you
want to generate force fields.
- In the Attribute Editor,
select the nParticle object’s nParticleShape tab.
- In the Point Field Generation section,
turn on force fields by selecting one of the following from the Point
Force Field list:
- ThicknessRelative:
Generates a Point Force Field that is relative
to the radius of the nParticle object. See
Radius.
- World Space:
Generates a Point Force Field that is relative
to world space.
- Adjust Point Field Magnitude to
increase or decrease the Point Force Field strength.
- Adjust Point Field Distance to
specify how far from the nParticles’ center the force field will
be active.
Nucleus objects located
in the area specified by the Point Field Distance are
affected by the nParticle’s Point Force Field.
Controlling a Point
Force Field using the Point Field Scale ramp
You can use the Point
Field Scale ramp to provide additional control of your nParticle
object’s Point Force Field. For example,
you can define a Point Field Scale curve that
varies Point Field Magnitude along
the area defined by Point Field Distance.
For information about
nParticle attribute ramps, see
nParticle internal ramps and per-particle attributes.
To control a Point Force Field using
the Point Field Scale ramp
- Select the nParticle object that you
want to generate point force fields, and in the Attribute
Editor, adjust the object’s Point Force Field attributes.
See
To generate a force field for an nParticle object.
- In the Point Field Scale section
of the Attribute Editor, set the ramp options
by doing the following:
- Create the Point Field Scale curve
by setting values for Selected Position and Selected
Value. For more information, see
Set nParticle internal ramps.
- Set an Interpolation method
to determine how Point Field Magnitude blends
between each position on the ramp. See
Interpolation.
- Set Point Field Scale Input to
determine which attribute is used as the input attribute for the Point
Field Scale ramp.
- Set Input Max to
define the range of the Point Field Scale ramp.
See
Input Max.
Setting Point Field
Dropoff
You can use the Point
Field Dropoff ramp to specify how much the Point Field
Magnitude drops off nParticle’s center and the edge of
the area defined by Point Field Distance.
For information about
nParticle attribute ramps, see
Set nParticle internal ramps.
To set the Point Field Dropoff
- Select the nParticle object that you
want to generate point force fields, and in the Attribute
Editor, adjust the object’s Point Force Field and Point
Field Scale attributes.
- In the Point Field Dropoff section
of the Attribute Editor, set the ramp options
by doing the following:
- Create the Point Field Curve curve
by setting values for Selected Position and Selected
Value. See
Set nParticle internal ramps.
- Set an Interpolation method
to determine how Point Field Dropoff blends between
each position on the ramp. See
Interpolation.
