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Introduction
This is the result we will create, a spinning star that never stops, gliding slowly, and emerging from transparency. Everything without a single keyframe, just with a few expression words. Let's start. Hello, welcome back to the complete Adobe After Effects series from Cerdas Inovasi Digital. Module 9 discusses expressions, which are small pieces of code that calculate property values on every frame. Don't worry, we start with the simplest expression. Time.
Step 1: Preparing the Star
Create a composition from a cloudy sky footage. Press F2, select the Start Tool with a yellow fill, then drag the star in the center of the screen. Rename the layer to 'star' and move it to the left of the screen by typing position 480.
Step 2: Opening the Expression Column
Press R to show rotation. Hold Alt and click Stop Walk Rotation. A expression column appears in the timeline with the text transform point rotation, and the rotation number changes to red, the value sign is now calculated by the expression.
Step 3: Time Expression
Replace the text with time x 90. Time is the composition time in seconds. At one second the result is 9,0 degrees, at two seconds 180, and so on. The star spins a quarter turn per second, continuously, without keyframes.
Step 4: Value Plus Time
Press P then Alt click Stop Walk Position. Type value plus parenthesis time x 150,0. Value is the original property value. So the star moves to the right 150 pixels per second from its current position, with constant speed.
Step 5: Expression on Opacity
Press T then Alt click Stop Walk Opacity. Type time x 30. At zero seconds opacity is 0, then rises 30% per second and automatically stops at 100, because opacity cannot be more than 100%. Click the expression graph button to see the straight line result of time in the keyframe area.
Step 6: Graph and Disabling the Expression
The icon is the same as in the expression column and can be clicked to temporarily disable the expression. Rotate the preview, stars appear, spin, and smoothly slide.
Done!
Done. We have opened the expression column with Alt-click Stop Walk. Using time for continuous rotation, value plus time for constant motion, expression on opacity, and the result graph of the expression. In the next episode, we will learn the favorite animator expression, Wiggle. Need a promotional video, logo animation, motion graphics for social media, or visual effects for short films? Cerdas Inovasi Digital provides motion graphics and visual effects services, as well as opens After Effects courses from beginner to advanced. Want to master the entire series? 104 episodes from the interface to the final project? All episodes, complete with PDF step-by-step guides, source footage, and project scripts, are available for premium tutorial subscribers. Subscribe starting at Rp69.000 per month, save 28% with the 12-month package, or pay once Rp999.000 for lifetime access. Want just one class? Buy a single class with lifetime access. Subscribe now at the premium page cerdasinovasidigital.com Contact us via WhatsApp, or visit cerdasinovasidigital.com Thank you for watching, see you in the next episode. Thank you for watching, see you in the next episode.
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Cerdas Inovasi Digital Team
Software developers, BIM & 3D engineers, and AI practitioners
53 video classes1,279 episodes
We build software, BIM models, games and AI automations for clients every day, and turn that hands-on work into step-by-step classes: every step is shown on screen and comes with a PDF guide you can keep.
