write-on expression needs dimension 2, not 1.

Question

Hi

I am new to AE and am trying to get an effect where a ball follows a sin curve across a comp leaving a drawn sine wave behind it. I found a helpful tutorial that said use the expression write-on

I add the effect to a new shape layer, alt+click the timer to open the expression space. Then I try to set a variable like 'amp=50' and get - 'expression result must be of dimension 2, not 1'

On the video the guy just typed variables like the one I want above and it was fine. I can't seem to find out what I am doing wrong.

Thanks

E

Mylenium · Answer

Since you haven't offered any link to the tutorial it is impossible to know, but the simple truth likely is that you haven't followed it to the T and need to rewatch it. The warning is pretty clear and of course just typing in a variable won't do much, anyway. I would suggest you actually watch the tutorial in full before prematurely messing around with incomplete code. Other than that the immediate fix would of course be something like

amp=50;

[value[1],amp]

but I doubt that's what you actually want, given that all it would do is produce a static value, not the full animation.

Mylenium

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