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Another concept of accessing and looping through an emitter’s particles is the “for for ... in“ method. In this case the currently existing particles are written to a list. With a continuous stream of particles this list grows larger with every frame and allocates more memory. Because of the higher memory demand the “for … in” method is often restricted to a certain number of particles. One of the most common approaches is to detect particles colliding with objects. A loop with “for … in” with an events script may look like this:

emitter       = scene.getEmitter("Circle01")
all_particles = emitter.getParticles() 
 
for single_particle in all_particles:
    do something here

The “allall_particles” particles list contains a 1:1 copy of all currently existing particles in your scene and you can loop through them. But sometimes you will only want to restrict operations to a certain amount of particles, maybe the first 1,000 particles. For this purpose, it is possible to set a certain range with a start, stop and step value:

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Loops are one of the most important methods with RealFlow scripts, especially when you have to deal with particles. There is always a situation where you have to go through all of, or a certain amount of, the particles or objects. For this reason it is highly recommended to become familiar with all different kinds of loops.