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This page provides information on the Follow Path component.
The Follow Path helper force pushes a fluid along a spl= ine curve.
The degree of force is controlled by a vi= rtual pipe around the spline.
For points outside the pipe, the force = pushes the fluid toward the spline. For points inside the pipe, the force p= ushes the fluid along the spline, in one direction.
To create balance between predictability and the randomness of natural b= ehavior, 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, a= nd Rotation Speed parameters.
Meanwhile, the Influence parameter determines the degre= e to which terminal velocity is used, instead of fluid dynamics.
Spline | spline =E2=80=93 Specifies = the spline object providing the path.
Follow Speed | axsp =E2=80=93 S= pecifies the terminal velocity of the fluid moving along the spline. This p= art of the force is most pronounced inside the pipe.
Pull Speed | radsp =E2=80=93 Sp= ecifies the terminal velocity of the fluid moving toward the spline. This p= art of the force is most pronounced outside the pipe.
Rotation Speed | orbsp =E2=80= =93 Specifies the terminal velocity of the fluid that flows around the spli= ne.
Influence | strength =E2=80=93 = When a fluid's velocity is being calculated, there are two calculations in = play: the terminal velocity specified by the speed parameters on this rollo= ut, and the simulator's calculation of fluid velocity based on fluid dynami= cs. The Influence parameter determines the degre= e to which terminal velocity is used instead of fluid dynamics when calcula= ting speed and direction. A value of 0 relies entirely on fluid dynamics wh= ile a value of 1 means the fluid's velocity is set immediately to terminal = velocity. Intermediate values give the fluid a certain degree of freedom to= respond to fluid dynamics, which provides some natural variation while giv= ing a degree of predictability.
To simulate liquid that is constant= ly accelerating (such as free-falling liquid reacting to gravity), use a hi= gh terminal velocity and a very low Influence va= lue.
Sub Segments | subsegments =E2= =80=93 Breaks the spline into several parts of equal size. Each sub segment= influences the simulation separately, allowing the force effect to accumul= ate over areas with multiple segments nearby.
Max Distance | maxdist =E2=80= =93 Specifies the distance from the spline at which the force no longer aff= ects the fluid.
Fade Start | fadestart =E2=80= =93 Specifies the relative distance (as part of the Max Distan= ce) where the force starts to decline, expressed as a decimal frac= tion.
Pipe Radius | radius =E2=80=93 = The radius of the virtual pipe used to determine where the Fol= low Speed is replaced with the Pull Speed= strong>.
Affect | affect =E2=80=93 Speci= fies the affected components of the simulation separated by commas. Any unk= nown element found in the list is ignored. The supported elements are:=
Liquid - affects th=
e Liquid particles in a Liquid simulation.
Splashes - affects the Splash particles in a Liquid simulation.
Mist - affects the Mist partic=
les in a Liquid simulation.
Air -&nbs=
p;affects the space in a Liquid simulation where there are no Liquid partic=
les, when Simulate Air Effects is enabled in the=
Dynamics rollou=
t. All particles such as Foam, Splash or Mist outside the liquid volume wil=
l be influenced.
Temperature - affects the voxels =
in a Fire/Smoke simulation where the Temperature is different than the defa=
ult 300 Kelvins. The higher the temperature above 300 or the lower it is be=
low 300, the stronger the effect of the force would be. You can find o=
ut more about Phoenix Grid Channel Ranges here.
Smoke - affects the=
voxels in a Fire/Smoke simulation where there is Smoke. The denser the smo=
ke, the stronger the effect of the force would be.Fuel - affects the voxels in a Fire/Smoke simula=
tion where there is Fuel. The denser the fuel, the stronger the effect of t=
he force would be.
Affect Names are <= em>not case sensitive and any unknown element found in the list is ign= ored.