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This page provides information on the Follow Path (PhoenixFDFollowPath) component.

Overview

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The Follow Path helper force pushes a fluid along a spline curve.

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The degree of force is controlled by a virtual pipe around the spline.

For points outside the pipe, the force pushes the fluid toward the spline. For points inside the pipe, the force pushes the fluid along the spline, in one direction.

To create balance between predictability and the randomness of natural behavior, two important values are used: terminal velocity and influence.

The terminal velocity is the maximum velocity a particle can reach, and is set by the Follow Speed, Pull Speed, and Rotation Speed parameters.

Meanwhile, the Influence parameter determines the degree to which terminal velocity is used, instead of fluid dynamics.

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When the Influence is set to an intermediate value, it gives the fluid a certain degree of freedom to respond to fluid dynamics, which provides some natural variation, while also maintaining a degree of predictability.

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titleUI Path: ||Phoenix FD|| > Create > Follow Path

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Follow Path Curve

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Spline | spline – Specifies the selection set for the spline object providing the path.

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Remove Object – Removes selected objects from the follow path curve calculation.

 


Parameters

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Follow Speed (units/sec) | axspunits – Specifies the terminal velocity of the fluid moving along the spline. This part of the force is most pronounced inside the pipe. 

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Liquid - affects the Liquid particles in a Liquid simulation.
Splashes - affects the Splash particles in a Liquid simulation.
Foam - affects the Foam particles in a Liquid simulation.
Mist - affects the Mist particles in a Liquid simulation.
Air - affects the space in a Liquid simulation where there are no Liquid particles, when Simulate Air Effects is enabled in the LiquidDynamics rollout. All particles such as Foam, Splash or Mist outside the liquid volume will be influenced.
Temperature - affects the voxels in a Fire/Smoke simulation where the Temperature is different than the default 300 Kelvins. The higher the temperature above 300 or the lower it is below 300, the stronger the effect of the force would be. You can find out more about Phoenix Grid Channel Ranges here.
Smoke - affects the voxels in a Fire/Smoke simulation where there is Smoke. The denser the smoke, the stronger the effect of the force would be.
Fuel - affects the voxels in a Fire/Smoke simulation where there is Fuel. The denser the fuel, the stronger the effect of the force would be.

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