Reuse a set of elements and manage them from one place.Precomping prevents a composition from containing too many layers to manage in one timeline, but it also lets you do the following: Two options appear (the second option grayed out if multiple layers have been selected): to leave attributes (effects, transforms, masks, paint, blending modes) in place or transfer them into the new composition. Typically, precomping is done by selecting the layers of a composition that can sensibly be grouped together, and choosing Precompose from the Layer menu (keyboard shortcut Ctrl+Shift+C/ Cmd+Shift+C). Closely related to this is composition nesting, the act of placing one already created composition inside of another. Precomping is the action of selecting a set of layers in a master composition and assigning it to a new subcomp, which becomes a layer in the master comp. Yet precomping is both an effective way to organize the timeline and a key to problem solving and optimization in After Effects. Artists may sometimes let a composition become unwieldy, with dozens of layers, rather than bite the bullet and send a set of those layers into a precomp. Precomping is often regarded as the major downside of working in After Effects, because vital information is hidden from the current comp's timeline in a nested comp. These tips are especially useful if you're someone who understands compositing but sometimes finds After Effects disorienting. shortcuts to help maintain orientation within the project as a whole.how to keep a complex, multiple-composition pipeline organized.how and why to work with some kind of project template.It's easy to lose track of stuff when projects get complicated. You may find the After Effects experience closer to what you might consider "real time." This type of efficient rendering depends not only on optimized software and a speedy workstation, but on well-organized compositions and the ability to plan for bottlenecks and other complications. know when to precomp (and when it's safe to avoid it).understand how to use multiple compositions.This chapter helps you both artistically and technically (as if it's possible to separate the two). At other times, you're more like a programmer, isolating and debugging elements of a project, even creating controlled tests to figure out how things are working. Sometimes you take the attitude of a master chef-you know what can be prepped and considered "done" before the guests are in the restaurant and it's time to assemble the pièce de résistance. Build a system that even a fool can use and only a fool will want to use it.
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