Resolves #8645

Changes:

1. Don't use a uniform to pass time in strands examples in p5.strands.js, material.js. Instead use millis() built-in.

2. In the example of how to pass a uniform for modify(), don't pass time as this now is not motivating. Instead, use an example where we'd NEED to use a uniform. (I chose a count of mouse movements - is there a simpler, easily demonstrated value that is not also covered by a built-in?)

3. Snuck in a couple of minor tidy-ups of other strands examples:
   3.1. removed old <div><code> element wrappers around examples in getTexture and smoothstep (the final remnants in the code-base).
   3.2 had smoothstep examples use buildFilterShader instead of baseFilterShader().modify

Changes per file and URL:

p5.strands.js

one replacement in each of the following:

• ✅ worldInputs: /reference/p5/worldInputs/
• ✅ smoothstep: /reference/p5/smoothstep/
• ✅ pixelInputs: /reference/p5/pixelInputs/
• ✅ objectInputs: /reference/p5/objectInputs/
• ✅ cameraInputs: /reference/p5/cameraInputs/

material.js

• ✅ createShader: /reference/p5/createShader/
  • ✅ near text: "Make a version of the shader with a hook overridden"
• buildFilterShader: /reference/p5/buildFilterShader/
  • ✅ near text: generate a color for each pixel
  • ✅ near text: You can also animate your filters over time using the
• buildMaterialShader: /reference/p5/buildMaterialShader/
  • ✅ near text: One thing you can do with a material shader is animate the positions of vertices
• loadMaterialShader:
  • ✅ near text: Inside your shader file, you can call
• buildNormalShader: /reference/p5/buildNormalShader/
  • ✅ near text: One thing you may want to do is update the position of all the vertices in an object over time
• loadNormalShader: /reference/p5/loadNormalShader/
  • ✅ near text: might use the finalColor hook to change
• buildColorShader: /reference/p5/buildColorShader/
  • ✅ near text: One thing you might want to do is modify the position
• loadColorShader: /reference/p5/loadColorShader/
  • ✅ near text: Since this function loads data from another file
• buildStrokeShader: /reference/p5/buildStrokeShader/
  • ✅ near text: You might also want to update some properties per vertex

what I searched for

• \*.*uniformFloat\(
• \*.*setUniform\(
• \*.*millis\(\)

PR Checklist

• npm run lint passes
• [Inline reference] is included / updated
• [Unit tests] are included / updated -
  some unrelated unit test failures (mostly time-outs): noise, shape modes, typography.
• - Checked each modified example was still working

AI Usage

No AI was used in this PR or this write-up