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The loop, listed above, tells RealFlow that only non-daemons should be set to invisible. The "!=" operator means: "If the current node of the list is not (!=) a daemon then hide it to the user."
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The particle tracker script contains a lot of methods and features which are important for your daily scripting tasks. You have to filter out certain node types, define and call global variables, change all kinds of parameters, loop through particles and objects, record data, transfer or manipulate them, set export resources, and rename scene objects. All these fundamental principles are applied within a single script.