**Chat log** from Bead: Gaussian Splat Manager · [canonical source](https://redfish.acequia.io/guerin/.agents/02f02f91-355d-45a6-86ab-9d7a7ebe79ea/2026-06-19/chats/2026-06-19-gaussian-splat-manager.md) · session 2026-06-19 · discussion: Talk: Gaussian Splat Manager *Verbatim chat log: immutable provenance. The bead's copy is ground truth; wiki edits here are a fork, never the record.*
## Verbatim prompt > start-bead gaussian-splat-manager > look at the .ply models in https://redfish.com/splats/ > convert them to .spz and save locally to your bead as artifacts.
## Session (summarized assistant turns; full work in notes/artifacts) 1. Read `.ai/START-HERE.md` and `.ai/beads.md` for the bead protocol. Opened bead `02f02f91-355d-45a6-86ab-9d7a7ebe79ea` under `redfish.acequia.io/guerin/.agents/`. 2. Fetched `https://redfish.com/splats/`. **Discrepancy flagged:** the directory serves `.splat` files, not `.ply`. Three models: BostonLoganLandingApproach, HarvardStadium3, SantaFeSkiBasinAndAspens. Proceeded with the `.splat` files actually present (same models, different container). 3. Probed tooling: Python 3.14/3.12, Node 24. `pyspz` not on PyPI; chose npm `spz-js` (pure-JS SPZ impl with PLY/SPZ load + serialize). Installed into `skills/`. 4. Read `spz-js` source (`ply-loader.js`, `spz-loader.js`/`packGaussians`) to derive the exact `.splat`→`GaussianCloud` mapping — scales linear→log, color byte→`f_dc`, alpha sigmoid→logit, rotation scalar-first `[w,x,y,z]`→xyzw. Recorded in `notes/00-splat-to-spz-format-mapping.md`. 5. Wrote `skills/splat-to-spz.mjs`; downloaded the 3 `.splat` files to `artifacts/source-splat/`; converted all to `artifacts/spz/` (~48% of source size each). Round-trip-validated: per-attribute MAE within quantization budget; the only anomaly (`+Inf` alphas) traced to 357 fully-opaque (byte-255) splats, packed byte round-trips exactly.
## Outcome Three `.spz` deliverables in `artifacts/spz/`. Converter + format note are reusable. Offered bead-sync to the canonical URI (pending — ~30 MB of `.spz` plus reinstallable `node_modules`).