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This is the result we'll create: two gears rotating in opposite directions and a degree indicator that continuously follows. Only the large gear has keyframes. Let's get started. Hello, welcome back to the complete Adobe After Effects series from Cerdas Inovasi Digital. Pick Whip expressions are the fastest way to link one property to another property. We don't need to type code, just drag the spiral rope, and After Effects writes the expression for you. Create a composition from a cloudy sky footage and create a 12-point gray star named gerigi besar (large gear).
On rotation, create a keyframe at 0 degrees at second 0 and 360 degrees at second 8, then make the keyframe linear. Create a second smaller star named gerigi kecil (small gear) on the right side. This gear has no keyframes at all. Press R on both layers so that the rotation properties are visible.
Alt-click Stop Walk Rotation Gerigi Kecil. Next to the expression column, there is a spiral icon, which is Pick Whip. Drag the icon to the rotation property of gerigi besar and release it. The expression 'diskom.layergerigibesar.transform.rotation' is automatically written.
The small gear now rotates in the same direction and at the same speed as the large gear. Click at the end of the expression and type times minus 2. The smaller gear now rotates 2 times faster and in the opposite direction, just like real gears that mesh together.
Create a text 0 degrees named penunjuk (indicator). Open the text and Alt-click Stop Walk Source Text, then type mesh point round from the rotation of gerigi besar plus the degree symbol. The text now displays the angle of the large gear and updates on every frame.
Rotate the preview. Parenting links all transforms at once, whereas Pick Whip Expressions only link one property and can be manipulated with formulas. Just change the keyframes of the large gear, and everything linked adjusts accordingly.
Done. We've dragged the Pick Whip Expression, read the expression link property, redirected the link result, displayed the value as text through source text, and compared it with the target. In the next episode, we create a control panel with expression controls. 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 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 a single 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.
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