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I am trying to move points on a plane in a sine wave pattern but only a specific vertex group. I have no clue where to even start in the geometry nodes panel.

So far I have created my plane and assigned the selected points to a vertex group. Let's call the group my_points for this example.

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Now that I have the plane and vertex group, how do I apply a sine wave to those points in geometry nodes? Ultimately I want to do more such as tie the phase of the wave to the frame number, but for now, I just need a nudge in the right direction to get started by getting those points into play in the nodes editor.

THANKS!

UPDATING MY QUESTION

I tried the nodes from the first answer. I don't get anything even similar. Can you spot what I have done wrong?

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Here are the results I end up with...

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1 Answer 1

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You can use trigonometry with Math nodes. To get access to the vertex group, simply add a new input, connect it to the selection input of a Set Position node.

Go into the modifiers tab, click on the Input Attribute Toggle (enter image description here) and choose your vertex group in the field.

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Here's the setup :

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  • $\begingroup$ I must be doing something wrong. I think I replicated your exact set of nodes and I don't get anything even close to your results. I am using Blender 3.1. I will add screenshots to my original post. Maybe you can spot what I have done wrong. $\endgroup$
    – Glenn J. Schworak
    Commented Mar 25, 2022 at 22:47
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    $\begingroup$ you need a sine node -not a sign one- to do the wave thing... same math node but a different function $\endgroup$
    – alambre
    Commented Mar 26, 2022 at 2:53
  • $\begingroup$ OMG! What a bone headed mistake... I looked and looked and simply didn't realize I picked the wrong node type. THANK YOU! $\endgroup$
    – Glenn J. Schworak
    Commented Mar 26, 2022 at 11:02

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