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This is what I have:

enter image description here

This is what I want to get:

enter image description here

The latter is made with scaling instances, that's not what I want.

I want to be able to reverse-delete the geometry by controlling the point indices with math nodes and such.

So, how to control the indices in order to get to the result I want?

EDIT: I also need 'smoothing' or 'easing' to the beginning and the end of each mini-line, that's a whole another challenge, perhaps.

Here are the nodes of the first example:

enter image description here

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3 Answers 3

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you can maybe try this:

enter image description here

to get this:

enter image description here

this is not exactly what you want - but hopefully it helps.

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    $\begingroup$ Thank you so much! :) Seems to be very close to what I want, actually, yes. This is introducing a very nice way to use 'point' and 'instance' indices, I learned a lot! $\endgroup$
    – Manu Järvinen
    Commented Jun 16, 2023 at 15:59
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And here I refined Chris' answer to include some easing, excellent!

One can easily change the easing in the 'Float Curve' node.

enter image description here

enter image description here

Nodes:

enter image description here

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Alternative answer from Chanfiroly in Twitter, great to have alternative ways of realizing this :)

enter image description here

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