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seedRandom expression changes results when duplicating comp

Community Expert ,
Dec 05, 2023 Dec 05, 2023

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Hi, I’m trying to do something with AE Expressions and they’re not behaving the way I expected. Any Expressions gurus who can advise me? The problem is with seedRandom. My expectation is that if I make a duplicate of this comp, the randomness shouldn’t change because I am using seedRandom. But it does change, and I don’t want that. Did I code something wrong?Screenshot 2023-12-05 at 23.32.55.png

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Community Expert , Dec 05, 2023 Dec 05, 2023

I don't think there's a good way to do that. Under the hood, I think the comp id gets factored into the seedRandom calculation. You might be able to use wiggle(), like this, which should give the same result in each duplicate comp:

seedRandom(index,true);
w = rotation.wiggle(0,1)-rotation;
diameter = 2500 + (w/2)*4500;
[diameter,diameter]

 

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LEGEND , Dec 06, 2023 Dec 06, 2023

Not really. The whole setup is designed wrongly from the outset. It would be easy enough to just consistently generate the values in a master comp/ dummy comp and remote-link them to the sub-comps. There is no requirement to convert anything to keyframes.

 

Mylenium

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Community Expert ,
Dec 05, 2023 Dec 05, 2023

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I don't think there's a good way to do that. Under the hood, I think the comp id gets factored into the seedRandom calculation. You might be able to use wiggle(), like this, which should give the same result in each duplicate comp:

seedRandom(index,true);
w = rotation.wiggle(0,1)-rotation;
diameter = 2500 + (w/2)*4500;
[diameter,diameter]

 

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Community Expert ,
Dec 05, 2023 Dec 05, 2023

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Thank you! I have used your expression and I can now duplicate the comp without the randomness changing 🙂

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Community Expert ,
Dec 05, 2023 Dec 05, 2023

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Even though you give the seed a value and change it to Timeliess = true, the random function still generates a random number. You will need to convert the expression to Keyframes using the Keyframe assistant to make duplicate comps that have the same look.

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LEGEND ,
Dec 06, 2023 Dec 06, 2023

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Not really. The whole setup is designed wrongly from the outset. It would be easy enough to just consistently generate the values in a master comp/ dummy comp and remote-link them to the sub-comps. There is no requirement to convert anything to keyframes.

 

Mylenium

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