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You can emit fluid from geometry or from particles. The fluid can be emitted from the surface, or from the entire volume of emitting geometry. Particles can emit from a spherical shape, or from instanced geometry shapes. Note that the viewport gizmo of the Source does not emit fluid itself - you have to first pick the geometry or particles you would use as emitters in the Source's list.

The Liquid Source interacts by default with all simulators position of the Source icon in the scene does not matter. If you have many simulators Simulators in the scene, you can restrict the source from emitting only into certain simulators using the Include/Exclude lists of the Simulatorsby default each Simulator will interact with a Source's Emitter Nodes as long as they are inside this Simulator. You can exclude Sources or Emitters from a Simulator's Scene Interaction rollout. If you use Include mode, you have to pick both the Source and its Emitter Nodes in the  Interaction List.

The Source can emit in 3 different Emit Modes - Surface Force mode creates fluid only at the surface of emitters, Volume Brush fills the entire volume of the emitters, and Volume Inject also fills the emitter's volume and adds pressure for an explosive effect.

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