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I'm currently trying to create a wavy pattern with shader nodes, each with two opposing wavy lines running diagonally across a square area.

However, I want the curves to end up with a seamless pattern so that this can be applied to a larger mesh.

seamless diagonal wavy pattern with opposing waves

Nodes are not new to me, but I am just learning how to use shader nodes.

My first patchy attempt at least got me as far as creating a wavy line, which unfortunately isn't much yet:

What I have achieved so far - Result What I have achieved so far - Nodes

I honestly have no idea which direction to go further in here, however I was thinking of mirroring this pattern, then multiplying it, then rotating it $45°$.

opposing waves

I'm pretty sure that's probably the wrong way to go though.

Does anyone have any ideas or tips on how I can create such a pattern?

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Maybe this?

enter image description here

I made the $45°$ rotation via the mapping node. The waves are generated by $\sin+\cos$.

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    $\begingroup$ Wow, Chris, thank you, that helps tremendously! Once again I learned something from you! Now that I see it, it seems absolutely logical to solve it this way and I was obviously completely wrong with the Wave Texture. However, I'm still struggling to get it 100% seamless. I'm not quite sure what parameters this is based on yet, and I'm still experimenting with it. Any ideas on this? $\endgroup$
    – quellenform ♦
    Commented May 27, 2023 at 16:50
  • $\begingroup$ btw: Using a Greater Than node or setting Linear to Constant in the ColorRamp creates the contrast I was looking for. $\endgroup$
    – quellenform ♦
    Commented May 27, 2023 at 16:57
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    $\begingroup$ @quellenform "still struggling to get it 100% seamless" - if you just want to render a seamless pattern in Blender, the setup should suffice, because you're not (or you shouldn't be) creating a piece of a pattern and then tile the pattern, you're just passing the coordinates to sin/cos which are (seamlessly) periodic functions. However if you want to create a tile to e.g. create a seamless texture, you either need to derive dimensions from sin/cos or derive angle from tangens. Most combinations of angle, width and height just cannot be seamless. $\endgroup$
    – Markus von Broady
    Commented May 27, 2023 at 17:24
  • $\begingroup$ @MarkusvonBroady "If you want to create a tile to e.g. create a seamless texture, you either need to derive dimensions from sin/cos or derive angle from tangens." ...thank you, this hint has been missing! $\endgroup$
    – quellenform ♦
    Commented May 27, 2023 at 19:09

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