Chris & Trish Meyer
CMG Keyframes is a repository for columns, articles, and videos created by Trish & Chris Meyer of the subject of creating motion graphics using Adobe After Effects and other related programs. It also contains articles on typography, audio, and 3D, as well as links to relevant articles Chris & Trish have published elsewhere.
Trish & Chris Meyer are the founders of Crish Design (formerly known as CyberMotion), an award-winning motion graphic design studio that has recently relocated from Los Angeles to the Albuquerque area. Their design and animation work has appeared on shows and promos for CBS, NBC, ABC, Fox, HBO, PBS, and TLC; in opening titles for several movies including Cold Mountain and The Talented Mr. Ripley; at trade shows and press events for corporate clients ranging from Apple to Xerox; and in special venues encompassing IMAX, CircleVision, the NBC AstroVision sign in Times Square, and the four-block-long Fremont Street Experience in Las Vegas.
In addition to their motion graphics work, Trish and Chris were among the original users of After Effects, and have written numerous books including "Creating Motion Graphics with After Effects" and "After Effects Apprentice" (both published by Focal Press). They speak regularly at conferences around the country, and perform custom training for studios. Both have backgrounds as musicians, and a close relationship between sound and picture informs much of their work.
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Sunday, July 04, 2010
Learning how to craft if/then/else statements plus do/while loops will open the door to a wide range of advanced techniques.
As your expressions become more complex, you will want to start making decisions in the middle of them – for example, if the current value is less than a certain number, do one thing; if it is greater than that number, do something different. Other decisions include “wait until the current time is past the next marker – then do this animation” or even “don’t freak out and give me an error message if you can’t find the marker, keyframe, or other layer you’re looking for.”
These sorts of decisions are often referred to as conditional statements, and expressions in After Effects supports them. The most common type of conditional is know it as an if/then or if/then/else statement. If you are not familiar with JavaScript, their format may be a bit different from what you expect, but they are easy to learn.
A variation on this theme is a do/while loop, which is an essential tool for overcoming expressions’ inability to remember what happened beforehand: You can use these loops to walk through every frame of the animation – accumulating information – until you get to the current frame.
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