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A Adjust a daemon's falloff section is subdivided into three categories:

Force Field Falloff

Enable Falloff

When ticked, the falloff feature is active.

Display Falloff

Activate the checkbox and you will see a viewport gizmo in the form of two yellow boxes. The space between the boxes determines the falloff area.With different “falloff options” the gizmo will change accordingly to a sphere or plane, but the mode of operation is still the same. 

In order to transform the falloff area change "Falloff Bounds"/"Falloff Objects" or use the manipulator tool from the "Line Falloff" section.

Keep Falloff Parented

Tie the falloff to the daemon's translations.

Transformation Falloff

. The following daemons have a falloff option: Attractor, Gravity, Wind, Vortex, Noise Field, k Volume, k Speed, k Age, k Isolated.

 

Image Added

 

Falloff gizmo

The falloff shape can be transformed independently: just click on the Falloff option below the daemon and start modifying it on 3ds Max viewport.

Active

Enable or disable the falloff effect for the daemon.

Show Falloff

Enable this option to view a representation of the falloff bounds in the viewport. It is not valid for the Object mode.

Falloff Length | Falloff Width | Falloff Height

These parameters are used to scale the falloff volume's viewport gizmo along the XYZ axes individually.

Falloff Percent

This value is used to increase or decrease the falloff area – the inner falloff limit is represented by a dashed cube/spherered volume; the outer limit is the bigger box/sphere:, white volume.

By default the falloff goes from the gizmo's inner box/sphere to the outer box/sphere, but it can be inverted with this option
  • Values should range between 0.0 and 1100.0 (maximum= no falloff).
  • Negative settings are also valid and can be used to extend the falloff area beyond the gizmo's outer limit.
  • The greater the value, the earlier the force falloff starts (= the smaller the inner red volume).
  • With 0.0 the falloff area is 0 as well – the gizmo cubes/spheres have exactly the same size.
Invert Falloff
  • In Object mode the "Falloff Percent" represents the distance from the object surface.
Falloff Bounds

Your options are:

  • "Plane". A red and a white 2D plane appears. "Falloff Height" controls the distance between both planes.
  • “Box”. This is the standard representation and the space between the two cubes defines the falloff area.
  • “Sphere”. Instead of two boxes you will see the two spheres.
  • “Object". Here, an object is used to calculate the falloff's shape. The associated object(s) are specified under "Falloff Objects".
Falloff
Objects

When With Falloff Bounds > Objects is active Object you can choose one or more objects to calculate determine the falloff's shape.

Line Falloff

This is Maya's standard dialogue for curves. Please take a look at Maya's user manual for more information on how to use the graph and its associated parameters and options.

Show Manipulator Tool
When you click on this button a separate window appears where it is possible to adjust a daemon's falloff visually in the viewport. In order to make this tool work correctly, activate "Enable Falloff" and "Display Falloff"
Decay Type

Here you can choose how fast the forces will vanish towards the falloff's outer limit (= white gizmo box). There are five options, while "Cubic" represents the fastest falloff.

Invert Falloff

By default the falloff goes from the gizmo's inner volume to the outer volume, but it can be inverted with this option.

Falloff Parented

Tie the falloff to the daemon's translations.