After effects Linear Expression Tutorial - Automate Ball Bounce Squash & Stretch

Опубликовано: 04 Апрель 2026
на канале: After Effects Tech Desk

174

In this video I cover a setup I rigged in Adobe After Effects to control squash and stretch on a bouncing ball without plug-ins, and no puppet pins.

Just good clean code using the super-useful and versatile linear() function.
Here's the code from the video:

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Basic Format of Linear Expression:

linear(input, inputLow, inputHigh, outputLow, outputHigh);

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Code used in Video:

t=transform.yPosition;

inLow=thisComp.layer("Scale_Controls").effect("y_limit_lower")("Slider");
inHigh=thisComp.layer("Scale_Controls").effect("y_limit_upper")("Slider");

outLowX=thisComp.layer("Scale_Controls").effect("scaleX_limit_lower")("Slider");
outHighX=thisComp.layer("Scale_Controls").effect("scaleX_limit_upper")("Slider");

outLowY=thisComp.layer("Scale_Controls").effect("scaleY_limit_lower")("Slider");
outHighY=thisComp.layer("Scale_Controls").effect("scaleY_limit_upper")("Slider");

sx=linear(t,inLow, inHigh, outLowX, outHighX);
sy=linear(t,inLow, inHigh, outLowY, outHighY);

[sx,sy]; ----

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