Add 3D noise(vec3) support to p5.strands

[LalitNarayanYadav]

Summary

This PR adds noise(x, y, z) support to p5.strands using a GLSL-based 3D noise implementation.

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Changes Included

• New GLSL File: noise3DGLSL.glsl

  • Implements fractal noise in 3D using vec3 input.
  • Based on public domain / MIT-licensed noise code.

• Updated: ShaderGenerator.js

  • fn.noise now supports noise(x, y, z) in shader context via vec3.
  • Graceful fallback to default p5.js noise when not in shader mode.
  • Handles both 2D and 3D noise internally.

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Usage Example

modify(() => {
  let n = noise(x, y, time); // 3D noise support
  stroke(n);
});

PR Checklist

• npm run lint passes
• [Inline reference] is included / updated
• [Unit tests] are included / updated

[Inline reference]: https://p5js.org/contribute/contributing_to_the p5js_reference/
[Unit tests]: https://github.com/processing/p5.js/tree/main/contributor_docs#unit-tests

[LalitNarayanYadav]

fixes #7897

[LalitNarayanYadav]

Hi @davepagurek! I've opened a PR that adds noise(vec3) support in p5.strands using a 3D GLSL noise implementation. It falls back gracefully to the original noise() outside shader mode and includes both 2D and 3D support within the same function. Let me know if you'd like any refinements or if there's a preferred way to handle noiseDetail() in the future .

[lukeplowden]

Thank you Lalit, great work! I will review this later on today.