...
To edit the control points it is necessary to switch to RealFlow’s “Move” mode by pressing the W key or select the appropriate icon. It is only possible to edit the points with this mode, rotation and scale have no effect. The standard spline emitter shows three control points, surrounded by yellow circles. These circles represent the zones of influence of the various forces. Each of these zones can be adjusted individually and it is also possible to add or remove control points, but you cannot delete the three default control points.
The daemon’s height (up-down direction) can be adjusted with Node > Scale, while scale changes in horizontal direction have no effect. Height changes always depend on your preferences – some programs use the Y axis, others Z.
...
D. The dots at the beginning and the end of the spline are tangent control points.
Affect
Particles can be affected in two ways: either by “Force” or “Velocity”. The first option applies an external force, resulting in an acceleration, while the second one only modifies the velocities of the particles without introducing an additional acceleration. “Velocity” is not available for rigid bodies.
...
The yellow circles around each control point indicate the zone of influence. The radius of , given in metres [m], of these circles can be increased or reduced with this parameter. The new radius will be automatically updated and displayed in the viewport.
...