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Force Field panel

Force Fields offer a way to add extra movement to dynamic systems like Particles, Soft Bodies, Rigid Bodies and Cloth objects.

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Force Fields panel

Force Fields offer a way to add extra movement to dynamic systems like Particles, Soft Bodies, Rigid Bodies and Cloth objects.

Note that when you work with particles, softbody or cloth system and change one of the force fields parameters, then you need to recalculate the particles, softbody or cloth systems.

Type

There are several force field types available.

Boid

Creates a force that acts as a boid's predator or target.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Charge

Special force field based on the charge of particles. Charge force fields just affects other charge force fields.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Curve Guide

Creates a force along a curve object. There is no way to add a curve here though.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Drag

Create a force that dampens motion.

Entry	What it does
Linear	Drag component proportional to velocity.
Quadratic	Drag component proportional to square velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Fluid Flow

Create a force field based on fluid simulation velocities.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Force

Radial field towards the center of an object.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.

Affect

Entry	What it does
Location	Affect the location of the particles.
Rotation	Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Gravitation	Multiply force by 1 divided through the distance in square.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Harmonic

The source of this force field is the zero point of a harmonic oscillator.

Entry	What it does
Strength	The strength of the force.
Damping	Damping of the harmonic force.
Rest Length	The rest length of the harmonic force.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Multiple Springs	Every point is effected by multiple springs.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Lennard Jones

Force field based on the lennard jones potential. The Lennard-Jones potential describes the interactions of two neutral particles using a relatively simple mathematical model.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Magnetic

Force field depends of the speed of the particles.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Texture

Force field based on a texture. There is no way to add a texture here though.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Turbulence

Create turbulence with a noise field.

Entry	What it does
Strength	The strength of the force.
Size	The size of the turbulence.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Global	Use global coordinates for the turbulence.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Vortex

Spiraling force that twists the force object's local Z axis.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	—

Wind

Constant force along the Z axis.

Entry	What it does
Strength	The strength of the force.
Flow	Convert effector force into air force velocity.
Affect	Location: Affect the location of the particles. · Rotation: Affect the rotation of the particles.
Noise Amount	Amount of noise for the force effect.
Seed	The random seed for the noise amount.
Absorption	Force gets absorbed by collision objects.
Wind Factor	How much the force is reduced when acting parallel to a surface. Like a cloth.

Falloff Subpanel

Shape

Sphere

Falloff is uniform in all directions, as in a sphere.

Tube

Fall off results in a tube shaped force field. The Field’s Radial falloff can be adjusted, as well as the Minimum and Maximum distances of the field.

Cone

Fall off results in a cone shaped force field. Additional options are the same as those of Tube options.

Z Direction

Fall-off can be set to apply only in the direction of the positive Z Axis, negative Z Axis, or both.

Entry	What it does
Power (Power)	How the power of the force field changes with the distance from the force field. If r is the distance from the center of the object, the force changes with 1/rPower. A Fall-off of 2 changes the force field with 1/r2, which is the falloff of gravitational pull.
Min Distance	The distance from the object center, up to where the force field is effective with full strength. If you have a Fall-off of 0 this parameter does nothing, because the field is effective with full strength up to Max Dist (or the infinity). Shown by an additional circle around the object.
Max Distance	Makes the force field only take effect within a specified maximum radius (shown by an additional circle around the object).

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