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I know we can plot equations / functions with the Math Function - XYZ Math Surface Option in Blender and then use a Screw Modifier to make it 3D see image below.

img1

img2

I would like to do this using Geometry Nodes so I can adjust the values / equation dynamically to see how different values will effect the plot. I know Animation Nodes can do this but the goal is to do this in Geometry Nodes. Any thoughts / ideas how this can be accomplished?

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    $\begingroup$ AFAIK this isn’t possible „only“ with GN right now - but of course you could rebuild the math equations with nodes, but if i understood you right - you don’t want that. $\endgroup$
    – Chris
    Commented Jan 2, 2022 at 10:16
  • $\begingroup$ @Chris if I build this with nodes (not sure the difference between nodes and geometry nodes is) will this allow the mesh to be dynamically changed? How can this be done? Any examples to look at to see if it will create what I'm trying to do? $\endgroup$
    – Rick T
    Commented Jan 2, 2022 at 10:37
  • $\begingroup$ i meant math (geometry) nodes of course... ;) $\endgroup$
    – Chris
    Commented Jan 2, 2022 at 11:27
  • $\begingroup$ Another way to add the math nodes. Math Formula addon v1.2.0 youtube.com/watch?v=II_0Ep1z-Ks $\endgroup$
    – Rick T
    Commented Jan 25, 2022 at 19:08

2 Answers 2

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you could e.g. use this node setup:

I basically use index as x value (just multiply/add it so that it looks nicer), and here just a simple x*x function

enter image description here

or a sin - function:

enter image description here

and here an example of a 3d function:

enter image description here

enter image description here

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Well, you can rebuild this equation using a bunch of math nodes:

enter image description here

Build the line and offset Y by this equation

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