Daemons - k Speed

This is a very versatile daemon and can be used to not only delete standard particles (though its usage is restricted to particles), but also to relax fluids, or keep certain states. Similar to "k Age", there is a function for splitting and spawning particles to simulate spray, for example. The emitter's "Statistics" panel is your source for speed information.



Min speed

Use this field to define the minimum speed. Particles with velocities lower than this value will be deleted. If “Limit & Keep” is activated, a particle’s velocity will be limited to the adjusted speed value. The unit is metres per second [m/s].

Max Speed

All particles with velocities above this limit will be removed. As with "Min speed", the unit is metres per second [m/s], too.

Limit & Keep

You can choose between “No” and “Yes”, and by default this action is deactivated. By switching to “Yes”, RealFlow will use “Max speed” to limit all particles with greater velocities to this particular value and keep this speed. This is helpful if you do not want the particles to become faster and faster over time. Another field of application is the relaxation of fluids. With this technique it is possible to withdraw energy from the particles over time, making the fluid rest and remove sloshing. From such a relaxed fluid it is possible to make an initial state and continue with a fresh simulation.


Particles will not be deleted when they reach the defined speed limits, but new ones will be created. In this case, "k Speed" splits up the particles and creates a certain number of new particles. This number is specified under “@ # child”. The amount of particles can rapidly grow when this option is active. If simulation times drastically increase, we recommend using the “Dumb” particle type instead of “Liquid”. Dumb particles are simulated much faster, because they do not interact with each other. This is why they are perfectly suited to all kinds of foam, spray or additional splashes.

@ # child

Here you can define the number of child particles to be created if “Split” is set to “Yes” and the adjusted speed has been reached.


Here you can determine whether the daemon scope should be bounded or not, and the two possible settings are “Yes” and “No”. To change the dimensions of the boundary, it is necessary to enter new scale values in the "Node" panel. The values for X, Y and Z can be controlled independently. The bounding sphere is displayed in the viewport as three circles. The daemon's bounding sphere can be distorted with the “Shear” parameter under “Node”, but this only affects the visual representation in the viewport. The daemon's scope is not affected.