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You can use the Fire Source to emit fire and smoke into Fire/Smoke Simulators. It's not a problem to use it for emitting liquid as well, but you have to understand Grid Channel ranges well.

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 position of the Source icon in the scene does not matter. If you have many Simulators in the scene, by 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.

You can emit any fluid grid channel and you can emit many channels at once. Additionally, you can emit particles from the Source. If you want to emit unevenly only from some areas or volumes of the emitters, you can use a Mask for each of the emission channels. Also, note that if Emit Mode is set to Volume Brush or Volume Inject and the Mask uses Explicit Map Channel or Vertex Color Channel mapping, then the Mask will be applied on the whole volume, based on the closest geometry surface.

Additionally, each channel can have one or many Discharge Modifiers. They allow you to gain more precise procedural control over how the fluid gets emitted. Discharge modifiers vary the emission over different parts of the emitter depending on properties of the emitter - e.g. the direction of its normals, the speed of movement at each point of an animated emitter, etc.

The main purpose of Texture UVW is to provide dynamic UVW coordinates for texture mapping that follow the simulation. If such simulated texture coordinates are not present for mapping, textures assigned to your simulation will appear static, with the simulated content moving through the image. This undesired behavior is often referred to as 'texture swimming'. In Phoenix such textures can be used for mapping the fire or smoke color and opacity of volumetrics, as well as the color and opacity of meshes. Texture can be also used for displacing volumetrics and meshes.

UVW coordinates are generated by simulating an additional Texture UVW Grid Channel which has to be enabled under the Output rollout for the settings below to have any effect.

For additional information on the Texture UVW feature, please check the Dynamics rollout documentation.