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Let's talk about working with operators. The file on screen is named PFlow operators and it represents the carryover from our last video. Opening up the Particle view we can take a look at the structure of our current flow system. Now we can do that either clicking on the Particle view button on the right or simply using the keyboard shortcut, the number 6. Each entry currently displayed is an operator. Simply put, an operator provides a set of parameters that control a single component of a particle system. Those parameters can many times be animated, which allows a particle to change behavior even within a single event.
Clicking on the name of any operator opens its settings and controls on the top right side of the Particle view. That right side section being officially referred to as the Parameters panel. Behind each operator's name in the event, in parentheses, is that operator's most important or most typically adjusted parameter. With Birth, that would be the particle emission times, both stop and start and the total number of particles. The Rotation operator listing the direction the particles travel, while the Shape operator gives us an indication of the actual shape of the particles being emitted.
Using the resources in the Depot, an additional action can easily be worked into the current PFlow layout. You may remember that the word "action" simply serves as a general term that can be used to describe either an operator or a test. To add something to the existing particle flow structure you'd simply drag it from the Depot over into the Event display. Still holding down your mouse that action could then be either added to the event or used for the purpose of replacing an already existing action, which of those ways you go is determined by how and where you drop the action into the event.
Let's go into the Depot and select the Scale operator. Now holding down your mouse we'll drag it into our second or lower event. Notice that you see either a red or blue line. If when you drop the event a blue line shows up, you'll be adding that action into the existing event, in between the actions above and below where the blue line shows. Let's try that. So you can see now the Scale operator has been positioned between the Speed operator and the Rotation operator.
Now any time you want to delete an action you can simply select it and hit the Delete key on your keyboard. If you instead let go of your mouse, basically dropping it into the event when a red line shows, the existing action, the one your mouse is over, will be deleted and replaced by the action that you are dropping in. As you see the Scale operator has now replaced the Speed operator. Let's take things back to the way they were using the Ctrl+Z, Undo shortcut. Now, when dragging and dropping for the Depot, you actually have a third option.
If you instead take your action and drop it into an empty area of the event display you'll be creating a brand new event. Let's try that. With that, we would now have a third event that we could wire into our particle system. For our example, let's select that newevent, its labeled Event 002, and then hit Delete. By the way, any eent can be turned off by merely clicking on the light bulb to the right of its name. An action can be disabled within an event by simply clicking on its icon.
And you can easily change the layout of your particle events by merely grabbing their name, holding the mouse, and moving it around the screen. So that will give you a few things regarding working with operators. Next step, we will check out how you go about adding tests into an Event.
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