After Effects: Using previousKey and nextKey expressions

Demo summary
Shows how to use the new 'previousKey' and 'nextKey' expressions to reference specific keyframe values based on time.
Step-by-step
- Select a layer property and add at least one keyframe
- Alt-click (or Option-click) the stopwatch icon to add an expression
- Type 'previousKey()' or 'nextKey()' into the expression field
- Enter a time value in seconds within the parentheses to reference a specific point in time
Options
- Use 'previousKey' to find the value of the keyframe before a specific time
- Use 'nextKey' to find the value of the keyframe after a specific time
Watch out for
- The time value inside the parentheses must be measured in seconds
- Applying this expression as a static value will override existing animation between keyframes
Tips
- Use these expressions to measure specific keys and link them into more complex expression rigs
Highlights
“that's the basics of how this expression works”
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