Effects --> Generate --> Ramp or Effects --> Transition --> Linear Wipe followed by Effects --> Distort --> Polar Coordinates or Effects --> Generate --> Circle followed by Effects --> Transition --> Radial Wipe. Oldest trick in town...
I wish it would be that simple.
But I am stuck at animating it.
The colored circles have grow out of nowhere, draw a full circle and continue looping for at least five times.
I have managed to make one loop:
It could be that it is impossible to animate this effect using only 'Start' and 'End' parameters of a circle.
Any ideas how may I go around this problem?
So, anything new on this?
Create a shape layer with a linear black to white gradient. Apply Polar coordinates 100% rectangular to polar. Call this comp gradient.
In a new comp create a stroked circle shape layer and apply Gradient Wipe. Add your gradient comp to use as the gradient.
Animate Transition Completion and transision softness.
Add the circle comp to a new comp, set it as a 3D layer and adjust the rotation and orientation. You're done.
This is only one solution. None of them are one effect on one layer solutions but none are difficult.
Project file here.
What a nice result! Thank you so much Rick!