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These two sets of parameters control the fluid behavior of particles when Fluid Motion is enabled.
The Fluid model creates a field of buoyant (upward or downward) and vortex (spiral) forces that move the particles within your form in a manner similar to liquid. There are a couple of factors to keep in mind when working with Fluid forces:
Toggles whether the fluid forces are applied to your particle form.
Defines what type of force is applied to the fluid particles
Apply Force pop up
Determines if the force dictated above is applied Continuously, or only once (At Start) of the effect.
Defines the timeframe in which the fluid forces are applied to the particle form. Lower values equal a shorter timeframe and faster motion, higher values create slower forces and slower motion. If Apply Force is set to Continuously, this determines when the forces are regenerated.
Force Relative Position
A set of X, Y, Z coordinates which determine where in relation to the base form the forces defined above are applied to the particles.
Force Region Size
Determines the size of the area in which fluid forces are generated.
Defines how much upward or downward force is applied to the particles.
Random Swirl X, Y, Z
This controls how turbulent swirling forces are applied along the X, Y, and Z axis of the particles. The higher the number, the stronger the forces and the further the particles travel from their original position.
Adjust the complexity of the swirl patterns; low values provide large swirls, while higher values provide smaller swirls.
Adjusts the integer used to create a random effect. Changing this will help give one fluid particle effect a slight variation from any others you may have in your composition.
Controls the speed of the vortex is spinning, which increases and decreases the strength of its force on the fluid particles, as well as the direction.
Vortex Core Size
Adjusts the diameter of the vortex forces used to spin the fluid particles.
Tilts the vortex forces along the axis of the buoyancy force.
Rotates the vortex forces around the axis of the buoyancy force.
Note that this will only have a noticeable effect when the vortex tilt has been adjusted.
Visualize Relative Density
Control particle appearance with relation to the combined density of the particles and the fluid forces surrounding them:
Left to right: Visualize Density Off, Opacity, and Ligthness
Global Fluid Controls
These controls affect any and all particle systems within your Form effect that are using the Fluid physics model.
Fluid Time Factor
Controls the timeframe in which the forces are applied to the fluid particles. Lower values means the forces are applied more slowly, while higher values means they're applied faster. Note that this number increases exponentially, so if you're looking for finer controls, consider adjusting this value by the tenths-- a shortcut for this is holding down the Alt key while scrubbing the parameter, or you can manually enter in your values.
Defines how sticky your particles are to one another, creating a semi-fluid or thicker appearance.
Controls the complexity of the pattern of forces applied to fluid particles; higher values equal a more granular, micro interactions, while lower values create broader, macro interactions.
Low fidelity (left) versus high fidelity (right), notice the force affecting finer areas of the form on the right than they are on the left.