[AlexZ005]

Five animated background presets for core's new Configure Scene ▸ Background (core roadmap 65 M2, core PR into feat/65 from feat/65-visuals).

File	Preset
backgrounds/mesh-gradient.json	Mesh gradient — four drifting colours; the first leans towards the pointer
backgrounds/silk-gradient.json	Silk gradient — a warped two-tone gradient
backgrounds/noise-flow.json	Noise flow — domain-warped fBm, liquid / marble
backgrounds/metaballs.json	Metaballs — soft blobs, one follows the pointer
backgrounds/grain-dither.json	Grain & dither — gradient + film grain + ordered dither
backgrounds/index.json	the list core reads (PACKS_BASE/backgrounds/index.json)

• Each file is an ordinary background-domain shader graph document (format: 1, domain: "background", plus layer defaults). Core copies the graph into the scene when one is picked, so peers receive the document, never a CDN path.
• Generated by tools/backgrounds/build.cjs. node tools/backgrounds/build.cjs --check fails if the committed files are stale.
• CC0, our own work. Nothing was copied from WebGL-Fluid-Simulation or any other project.
• Not added to the root index.json: these are not Explorer packs.

Proof (core lane):

• tests/e2e/background-presets.test.cjs (node only): every file loads through core's loader and compiles. The GLSL passes glslangValidator at both budget tiers (octave cap 8 and 2).
• tests/e2e/background-layer.test.cjs serves these exact files to the app through a route on PACKS_BASE/backgrounds/. In the browser, each preset compiles, draws full screen and changes >50 % of the view. A held clock gives a still frame, and the pointer moves it.
• tests/e2e/visuals-xr-iwer.test.cjs covers the emulated Quest 3: the sphere at the low tier.

After merge (integrator): retag format-1 onto the merge commit and purge jsDelivr for backgrounds/*, then check each file's content. Until then core falls back to its one built-in preset and shows a Retry line.

🤖 Generated with Claude Code