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motion trail scale array question
so I have a little cursor and I’ve animated one layer. I duped the layer and added expressions to position and opacity from a tutorial I found online to create a motion trail. I’m trying to add an expression to scale to have the trail slowly taper:
x = thisComp.layer(index-1).transform.scale-10;
y = thisComp.layer(index-1).transform.scale-10;[x,y]
howeve, After Effects keeps giving me this error
After Effects warning: array piece can’t expand to more than one value
Expression disabled.is it the index-1 thats confusing it?
Thanks for any help in advance.
AK
x = thisComp.layer(index-1).transform.scale-10;
y = thisComp.layer(index-1).transform.scale-10;[x,y]
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6 Replies
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Got it to work. It was some kind of syntax thing. Here is the expression that works.
x = thisComp.layer(index-1).transform.scale[0];
[x-10,x-10]
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This should work too:
thisComp.layer(index-1).transform.scale – [10,10];
Dan
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thanks Dan, that makes it a bit clear still.
AK
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Hi guys,
Please forgive the rank noob wading in out of his depth. I am working through Dan’s tutorials in an attempt to learn how to make my own expressions. I have the same setup as Aaron is describing, but I tried using your transform expressions on the scale and it gives me an error:
Bad argument: Layer index 0 out of range.
Both your expressions give me the same error- yet the index function works fine in other expressions I’m using. Does this have something to do with the fact I’m using After Effects 7? I’ve tried looking through the FAQ but can’t find an answer.
thisComp.layer(index-1).transform.scale - [10,10]; -
My guess is that you have applied the expression to Layer 1 (the top layer in the timeline panel) and it’s trying to find the previous layer (index = 0), which doesn’t exist.
Dan
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D’oh! I assumed that as it copied layers above it would be referring below. Thanks for bothering with such a rookie mistake, Dan.
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