Moire Effect in Grasshopper

[GDaCas (Guilherme Da Cas)]

Hi everyone!
I’m new to Rhino/Grasshopper and I’m interested in creating a particular kind of moire effect in Grasshopper. I’m finding it terribly hard to find educational material for this purpose, or even software that could help me understand it. Maybe I’m not using the right combination of words to search for it.

I’m particularly interested in a moiré effect with vertical lines that creates what seems to be something like a Fermat’s Spiral distortion effect in the middle.

You start only with vertical lines, and by distorting them in this spiral shape, you start to see the moire effect. Depending of how much you “zoom out” (or add lines), you start to see more of the spiral and other effects all over the image.

Here are some examples I found online of what seems to be similar to what I’m looking for.

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I found this thread from many years ago about Moiré, but the definition with it’s components is not available anymore:

emergent_patterns_point

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Anyone have any idea how to kick off something like this?
Maybe Grid distortion?
Any help would be really appreaciated, even if it’s just a recommendation of a book, software, etc.

Thanks!

[GDaCas (Guilherme Da Cas)]

It seems that I could simulate this effect in Photoshop using the “Twirl Filter”.

Anyone have an idea of how to achieve such distortion on Grasshopper?
Maybe distroting an image in that way. Or controlling nurb curves.

[laurent_delrieu]

Hello
it is not too difficult in GH

You can combine transformations

If odd or even different results

moire_strips.gh (9.6 KB)

And don’t need to double post !

Distoring vertical lines to achieve a double spiral moiré effect

Hi, I am trying to emulate this effect that distorts vertical lines in a way that creates a Moiré effect with a double spiral in the center. Ideally, I should have control over the amount of distortion, and also the “scale” of it, like in the GIF example attached: [vertical_lines_moire_effect_web] I was hoping I could use Vector Fields to emulate this aesthetic, but it doesn’t work because the lines repel or attract in a way that I can’t get a close result. I’ve tried different iterations wit…

[tay.othman (tay.0)]

I’m currently away from my GH but I think you can use fields for it. Also it is possible through kangaroo.

[tay.othman (tay.0)]

How about this?

Maelstrom.gh (9.5 KB)

[GDaCas (Guilherme Da Cas)]

Wow guys!!!
This was exactly what I needed. You are amazing, thank you so much!