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This page provides information on the Plain Force component.
The Plain Force pushes a fluid according to the helper'= s orientation. It is used to produce a gravity or wind effect.
The dynamics are controlled by two parameters, that balance between pred= ictability and natural behavior: the Strength of the force= (magnitude), and Drag.
Note that the Drag determines how much the fluid=E2=80=99s behavior is suppressed, or h= ow closely it follows just the Plain Force, while also pre= venting the fluid from continuously accelerating forever.
Strength | strength =E2=80=93 S= pecifies the acceleration force measured in scene units/sec^2.
Drag | drag =E2=80=93 Specifies= a value between 0 and 1 to determine= how much of the existing velocity will be negated over a period of 1 secon= d. The higher the drag, the more the fluid behavior is suppressed and = the less the fluid features are pronounced. A value of 1.0 would completely stop the motion of the fluid.
Max Distance | maxdist =E2=80= =93 Allows you to limit the effect of the force to a box centered around th= e helper icon. The box is oriented along the Plain Force's arrow and extend= s infinitely to the sides, while the thickness of the box is represented by= the Max Distance option. In case Apply Force Behind Icon = is enabled, then the box's thickness doubles as the force would be applied = behind the helper icon as well.
Fade Start | fadestart =E2=80=
=93 This is a fraction between 0.0 and 1.0 of the Max Distance option and specifies the relative distance where the=
force starts to gradually decline. If set to 1, the force does no=
t decline at all and just abruptly quits as it reaches the Max Dist=
ance. If set to 0, then the force starts declining right =
from the beginning and gradually stops working as the distance reaches
Affect | affect =E2=80=93 Speci= fies the affected components of the simulation separated by commas. The sup= ported 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 Temperate ch=
annel in a Fire/Smoke simulation.
Smoke - affects=
the Smoke channel in a Fire/Smoke simulation.
Fuel - <=
span>affects the Fuel channel in a Fire/Smoke simulation.
Affect Names are not= case sensitive and any unknown element found in the list is ignored.<= /p>
All Fire/Smoke Channels | unformfiresmoke - When enabled, the Plain Force wi= ll affect the entire Fire/Smoke Simulator.
Note that even if you add all three chann= els: Temperature, Smoke and Fuel, this is not the same as enabling the opti= on to affect the entire Fire/Smoke Simulator. The option will allow the Pla= in Force to create Velocity even in the empty air where there is no Tempera= ture, Smoke and Fuel.
Apply Force Behind Icon | <= em>applyforcebehind =E2=80=93 When enabled, the force will be app= lied behind the helper icon as well. If this is turned off, the force would= be applied to all voxels or particles of the simulation, as long as the vo= xel or particle is in the range of the Max Distance option= .
Terminal velocity =E2=80=93 The velocity at which = the acceleration caused by the force (Strength) is equal t= o the deceleration caused by the drag.