1 person found this helpful
Add a gradient ramp (Effect>Generate>Ramp) to a solid. Set the ramp to radial and then animate the start and end point.
You can also do the same thing using a Shape Layer filled with a gradient. Just animate the gradient.
This is really basic stuff. Are you a NuBee?
I thought I'd illustrate Rick's method but because I don't know what background you're going to use I also illustrated ways of using a matter choker or feathered masks to make the edges of a white solid or gradient transparent.
A: This is how a shape layer with a radial ramp looks. The edges will be solid on a transperent background, but you can add a matte choker if you'd like to feather the edges.
B: A white solid with an eliptical mask can simply be feathered so the edges are transperent. Draw the circle with the eliptical mask tool while holding the shift key to create a perfectly round circle.
C: This is the same shape layer with a radial ramp as depicted in image A only shown on black a background.
D: This is the same white solid as depicted in image D only with feathered edges on a black background. One upside to doing it this way is you don't have to animate the start and end points of the ramp if you decide to animate the circle's position.
Sweet! That helps a ton.
Uh, thx Rick. I know it's super basic (no need to be condescending). NEver used AE before today. My areas of expertise are photoshop, illustrator, indesign, and modo for still images. Just trying to help a friend out with a bit of simple animation.