Wow Thank you Dan ! it solved the error.

I did a small change to add a gap on the Y otherwise they stack over each other:

numBooks = thisProperty.propertyGroup(3).numProperties;
bottomPos = thisProperty.propertyGroup(3)(numBooks).transform.position;
dIndex = numBooks - thisProperty.propertyGroup(2).propertyIndex;
bottomPos.valueAtTime(time -…

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Hi Dan,

I tried to added but I get an error on the bottomPos :

" Error : TypeError: ThisProperty.propertyGroup(...).property is not a function ".

I wrote the expression like this :

thisProperty.propertyGroup(2).index;
numBooks = thisProperty.propertyGroup(3).numProperties;
bottomPos =…

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Yes it’s that :).

Thank you again (never enough), I’m trying your solution now.

Hi Dan,

Thank you so much for your help,

sorry for the miscommunication, I attached a txt with the layer structure…is that the kind of infos you need?.

I will wrap my head around your solution, thank you so much for your time.

I will get back to you.

Ben.

Hi Dan,

Thank you for replying, I will try to explain a bit better.

So I’m trying to create a pile of falling books from the sky,

the idea is to animate the first book (the one who will touch the ground first), so a Position from let say 100(sky) > 800 (floor) on the Y axis with an ease, and a small rotation.

Than I’m trying to link the next books…

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Hi Everyone,

I wanted to say thank you in advance for all the knowledge you guys are sharing here.

I’m trying to index the Position (only Y axis) from a previous shape layer Group and apply that expression on all the other shape group Position so I only have to animate one layer once.

What I try to achieve is a pile of book falling on the ground, the…

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