How do I scale an object in only one direction?

I am animating a volume meter, and have done the "tricky bit" of getting the volume value. Now I want to apply the volume value to a mask , so that as the music moves, the mask is exposed in time to the beat. I have tried two ways, the first by scaling the mask. However, I can't get it to scale in one direction only (i.e. it scales around a center point.) Even if I move the pan anchor it still doesn't pin the base of the shape. The other way I tried was using a linear wipe. However, this was no good either, as the whole wipe effect is completed at 38% (i.e. if I move the slider the object vanishes totally at 38%, not 100% as I would expect.) Is there a better way to do this? Seems simple, but has me stumped.

asked Apr 16, 2015 at 9:20 195 1 1 gold badge 2 2 silver badges 9 9 bronze badges

1 Answer 1

Set the Anchor Point to the bottom of the asset by using the Anchor Point tool ( Y ) Tool icon in CC versionsTool icon in versions pre CC
Disable proportional scaling of that layer and set the desired keyframes

Demo in AE 22.0.0

Notes

The shape also can be used as track matte, just set the layer below to Alpha .
Consider to add a slider control
As alternative you could use a trim path on a shape layer as track matte, see this answer: https://graphicdesign.stackexchange.com/questions/49643/how-to-use-after-effects-trim-path-with-an-illustrator-path/49975#49975

answered Apr 16, 2015 at 10:53 2,324 4 4 gold badges 19 19 silver badges 36 36 bronze badges This doesn't work on v.17.1.1, apparently. Commented Jan 14, 2021 at 16:50 Still works the same way in AE 22.0.0 @LeeDean See the edit. Commented Nov 9, 2021 at 18:55

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How do I scale an object in only one direction?

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