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I need to animate an abstract visualisation of an expanding network in Blender 2.8, consisting lines that keep on growing until they meet at a junction point (represented by a sphere), where they split up again. As a little example I created a short animation in which, for lack of a more elegant solution, I animated all elements manually:

enter image description here

Is there a better, more time-saving solution how to animate such a scene using the Animation Nodes addon maybe?

Having very little experience in using this addon, I'd be very grateful for any tips!

Thank you very much in advance!

Cheers

Matthias

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Let's have fun with Animation Nodes then !

Teaser :

enter image description here

Teaser 2 :

enter image description here

Get the blend file here :

enter image description here

First, let's create a loop to instantiate the spheres and make them grow to their normal scale depending on a certain falloff : If you want to find a node by name, type CTRL + A and then the name of the node you are looking for.

In the topbar, go to Add > Subprogram > Loop

Add a new iterator of type "Object List" and a new parameter of type "Float" and then put the nodes like the screen after.

Don't forget to click "New Generator output" and choose "Float" to generate a float list which will help us instantiate the growing bars between nodes.

enter image description here

Next up, let's grow the bars. Create a new loop. Add an iterator of type "Edge Indices List", a new parameter of type "Vector List" and a new parameter of type "Float List".

We will be using the evaluation time to make the bars grow between the first node, which is supposed to have already appeared, and the second node, which will appear when its correspond float value reaches 0.

Add a new generator output of type "Spline List" in order to output them from this loop. We only want to add to this spline list the splines where the bar can indeed be visible. Thankfully yhis node has a hidden condition input.

While selecting the "Spline List" generator output node, press N on your keyboard to make the right hand panel appear. go to the item subpanel and check the screen icon on the right of the "Condition input". Illustration :

enter image description here

enter image description here

Now let's finish this with the main loop :

Add a "Viewport input" node which will let you modify values in your node tree directly from the viewport. Add a sphere object in object mode and choose it inside your instancer node. You can create invoke nodes of your subprograms by clicking on the first node and pressing W then choosing "Create invoke node"

Don't forget to set a new material for your spline or else the bars will stay white.

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  • $\begingroup$ That is just what I was looking for. Thank you very much for your quick answer and for the very detailed explanation of your setup! :) $\endgroup$ – Matthias S Mar 11 at 20:17
  • $\begingroup$ @MatthiasS My pleasure, actually I did not explain everything because I did not know how well you would fare with this. If you feel stuck I advise following the user guide animation-nodes-manual.readthedocs.io/en/latest/user_guide/… otherwise don't hesitate to ask for clarification here, I tried to make it straightforward but AN can be daunting at first $\endgroup$ – Gorgious Mar 11 at 20:29
  • $\begingroup$ @Gorgious, do you have a channel in Youtube? Your works with Animmation Nodes are brilliant. $\endgroup$ – Rita Geraghty stands by Monica Mar 12 at 12:51
  • $\begingroup$ @RitaGeraghtystandsbyMonica haha that's flattering but I feel like I only scratched the surface every time I discover something new to play with ! I considered it but I don't have the time nor software / dedication to produce good video quality and content at the moment. However there are very good tutors already there like Chris Prenninger or Zach Hixson for example. Don't hesitate to post questions on BSE though if you have particular ideas, I will most certainly take a look at it and try to crack it. $\endgroup$ – Gorgious Mar 12 at 13:29

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