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“Circle” is an area emitter. Emitters define the point of particle creation in 3D space, while the particles are part of the "Fluid" container. Emitters can be scaled, rotated, and translated like objects; an arrow indicates the direction of emission.



RealFlow Scene

In RealFlow | Cinema 4D it is possible to use multiple "Scene" trees in the same project:

  • To link the emitter to a different scene tree dragging the appropriate "Scene" node to this field 
  • Furthermore you have direct access to the selected "Scene" tree's → "Solver", → "Cache", and → "Display" tabs. For descriptions of these parameters follow the links.

To link the emitter to a "Fluid" drag the appropriate "Fluid" node(s) to this field.

To learn more about how to link RealFlow scene elements and make them interact take a look at the → "Manual Linking" page with examples.

Emitter Type

Toggle the emitter type with this drop-down menu. The following parameters and the viewport representation will be updated according to your selection. Bear in mind that type changes will change the emitter's and fluid's behaviour completely.


This feature creates a defined volume of particles. The size of this volume is defined by the emission area and the value entered here. Another way of creating a volume is to go the emitter's viewport gizmo and drag the middle handle up and down. This action will change the volume interactively and update the parameter accordingly.


Here the particles' initial speed is defined in metres per second. Higher values will generate more particles per frame. The number of emitted particles also depends on the fluid's “Resolution” settings. A value of 0.0 stops the emission of particles.

Vertical Random

To avoid regular emission, it is possible to randomly displace the particles. The parameter accepts any positive value and 0.

Horizontal Random

To avoid regular emission, it is possible to randomly displace the particles. The parameter accepts any positive value and 0.

Side Emission

Normally the particles are poured out along the emission axis, but it is possible to emit the particles from the emitter's edge. Then, the circle’s inner area remains empty.

Ring Ratio

You are able to define a ring from where the particles will be emitted. Small values create a larger emission area, higher settings are responsible for thin rings. The value's range is between 0 and 1.

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