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Lesson 5. Particles and Parameter Behavi... > Adding a Splash of Color - Pg. 129

Particles and Parameter Behaviors NOTE 129 When a particle system has only one particle cell (as in our example), Motion conven- iently combines the parameters for the emitter and the particle cell into the Emitter tab of the Inspector. If you were to add more particle cells, you would see only a few master controls specific to the emitter; the rest of the controls would then be found in the In- spector for each particle cell object. The first thing we want to do is make sure that older butterflies are drawn on top of newer ones to give the appearance that the butterflies are coming toward the camera. Toward the top of the Emitter tab of the Inspector, go to the Render Order pop-up menu and choose Oldest Last. 3. The older particles are now rendered after all the other particles and therefore appear in front. Adding a Splash of Color Now it's time to keep the butterflies from popping onto the screen. We can also vary their colors at the same time. TIP If you've fallen behind, feel free to open the project B.AddingColor to catch up. 1. From the Color Mode pop-up menu located about halfway down the Cell Controls parameters in the Emitter tab of the Inspector, choose Pick From Range. You'll see a color gradient appear, labeled Color Range. This allows us to indicate a range of colors for the butterflies. In this mode, Motion randomly selects a color from the chosen range each time a particle is generated. Notice the other options in the Color Mode menu; one of the most useful is Over Life. In this mode, particles start their life tinted the color at the left side of the range gradient, and by the end of their life they're the same color as the gradient on the right. That's great for things like flame particles, which might start their lives "hot" and cool off as they move away from the explosion. Click the disclosure triangle to the left of the Color Range label to reveal the gradient edit con- trols. 2.