User manual APPLE MOTION 5

[. . . ] Your rights to the software are governed by the accompanying software license agreement. The owner or authorized user of a valid copy of Motion software may reproduce this publication for the purpose of learning to use such software. No part of this publication may be reproduced or transmitted for commercial purposes, such as selling copies of this publication or for providing paid for support services. Use of the “keyboard” Apple logo (Shift-Option-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. [. . . ] Select an emitter or cell in the Layers list or Timeline, then choose a Parameter behavior from the Add Behavior pop-up menu in the toolbar. In the Apply To section of the Behaviors Inspector or HUD, choose an option from the Go pop-up menu. In the Emitter or Particle Cell Inspector, Control-click a parameter, then choose a Parameter behavior from the shortcut menu. Using Particles Behaviors The Particles category in the Library contains two behaviors specifically for use with the cells or emitter in a particle system: Scale Over Life This behavior lets you grow or shrink the particles in a system over the duration of each particle’s life. It has one main parameter and three optional parameters that appear depending on the selected Increment Type. Parameters in the Inspector Increment Type: Choose an option from this pop-up menu to determine which method is used to resize particles over their lifetime. There are four options: • Natural Scale: Specifies starting and ending scale percentages used to animate each particle’s size over its lifetime. Natural Scale uses an exponential curve to allow the animation to progress slowly when the scale values are small, and speed up when the values are large. This creates the illusion that the scaling is occurring at a constant speed. When Natural Scale is selected, the Scale At Birth and Scale At Death parameters become available. € Rate: Specifies a steady rate at which particles change size over their entire lifetimes. When Rate is selected, the Scale Rate parameter becomes available. 716 Chapter 14 Working with Particles • Birth and Death Values: Specifies starting and ending scale percentages used to animate each particle’s size over its lifetime. The scale amount generated by this option for a specific particle at a specific time is multiplied by the pre-existing particle Scale (defined in the Cell Controls section of the Emitter Inspector). When this option is selected, the Scale At Birth and Scale At Death parameters become available. € Custom: This mini-curve editor allows you to customize the scale of the particles over their lifetime. Click the disclosure triangle to display the mini-curve editor in the Inspector. For more information on using mini-curve editors, see Mini-Curve Editor. Scale At Birth: Determines the initial size of particles when they are created. This parameter appears when Natural Scale or Birth and Death Values is selected in the Increment Type pop-up menu. Scale At Death: Determines the size of each particle at the end of its lifetime. This parameter appears when Natural Scale or Birth and Death Values is selected in the Increment Type pop-up menu. [. . . ] Playback Control Gestures Use the gestures described in the following table for controlling playback. € To turn looping on or off, press Option. General Navigation Use the gestures in the following table for general navigation, such as zooming the Canvas and displaying the panes in the Motion user interface. gesture Description Zoom in to the Canvas. [. . . ]