Animating a perfect circle
Here’s a handy expression to animate an element travelling around the circumference of a circle without having to manually trace a path. This expression uses the sin and cos trigonometric functions. In Action, add the following expression to the Position X animation channel:
sin(frame/10) * 100
and this to the Position Y channel:
cos(frame/10) * 100
The multiplier at the end is the radius of the circle. The animation channels should have two oscillating curves, like so:
But let’s say we’d like the animation to happen in a spiral. Simplicity itself. Add another axis and animate a curve to go from 0 to say 100. Then replace the multiplier in the expressions above with the curve, like so:
sin(frame/10) * axis2.position.x
cos(frame/10) * axis2.position.x
And this is what you get:
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