This is one of those effects that can be done with multiple approaches, but here’s one. I’ll assume you know how to create and animate the line. Create your text on two layers, one for above the line and one for below. Make the animated line the top layer of your composition.
Next create a solid(cntl + Y), place it above the top layer of text. Using the mask tool, cut the solid layer in half at the animated line. Now for the top layer of text change it’s track matte to “Alpha Matte”. Now just animate the position keyframes of the top layer of text.
Duplicate the solid, change the bottom text track matte to “Alpha Matte Inverted” and animate it’s position keyframes.
Here’s a sample project illustrating this technique: 6693_textanimation.aep.zip
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.