I decided to continue this After Effects expression sharing series. Because I feel my first article was welcomed by some animators. I’m not sure how many samples I can share but I’ll share my code as much as possible.
Anyway, I share basic one again, yes it’s Pendulum. I think Pendulum movement is one of simplest but most useful thing. With this code, you can add omni-directional pendulum movement. If you want to animate like below, please check my code and/or download AEP.
I know you already know the simple pendulum expression like below. By the way, I use position property as a sample case.
freq = 1; amp = 50; value + [0, amp * Math.sin(freq * time * 2 * Math.PI)];
freq = 1; amp = 50; waveAngle = 40; //You can adjust the pendulum angle by changing this value. wave = amp * Math.sin(freq * time * 2 * Math.PI); value + [-wave * Math.sin(degreesToRadians(waveAngle)), wave * Math.cos(degreesToRadians(waveAngle))]
In the next sample, the expression calculates the pendulum angle which is vertical to the direction of movement.
freq = 4; amp = 20; waveAngle = radiansToDegrees(Math.atan2(velocity, velocity)); // calculating the angle with position property's velocity. wave = amp * Math.sin(freq * time * 2 * Math.PI); value + [-wave * Math.sin(degreesToRadians(waveAngle)), wave * Math.cos(degreesToRadians(waveAngle))];
Do you enjoy this article? This code might not be useful for every situation. But I hope it helps you out even just a bit to learn AE expressions.