From the course: After Effects Apprentice: 09 Expressions

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Quizzler 1 solution: Touching wheels

Quizzler 1 solution: Touching wheels - After Effects Tutorial

From the course: After Effects Apprentice: 09 Expressions

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Quizzler 1 solution: Touching wheels

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Your first Quizzler challenge was how to hook up these various pulleys to make them rotate as if they were actually all physically touching. I'll show the quick-and-dirty way to make this happen and then a trickier way of making it happen. The first thing I need to know is what is the relative size of these different pulleys? Since they all started from the same source layer, the clue is, how are they scaled? I'm going to type Shift+S to review Scale for pulley 1. It is scaled to 100%. Select pulleys 2 and 3, press S, they're scaled to 50% and 25%. Well, the rule with things like gears and pulleys and tires all this other stuff is that the relationship between your sizes exactly equals the relationships between their speeds. Smaller ones will rotate faster; bigger ones will rotate slower. Now you could copy and paste keyframes and manually edit values, but we showed you earlier in this lesson why that's a bad idea. Let's use expressions. Now before we hook up expressions, we need to…

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