# LANE C — GLB validation report (round 3) → for Lane E + Fable

*PROCITY-C, 2026-07-14. Round-3 task "GLB path visual validation" (ROUND3_INSTRUCTIONS §Lane C).
Validated Lane E's 9 fitting GLBs from `pipeline/_normalized/` in real interior rooms via the
`interiors/glb.js` upgrade path (`useGLB` on). Verdict below; the 5 "good" assets are live.*

## How validated
- Served the 9 `procity_fit_*.glb` locally (`web/assets/_local_glb/`, copied from `pipeline/_normalized/`)
  and pointed `glb.js` at them via a new `manifest.localBase` (loads before/without the depot, per the
  round-3 instruction). Production still uses `depot:<file>` unchanged.
- Toggle **GLB props** on the interior test page (`web/interior_test.html`) rebuilds every shop type
  with the GLBs and re-renders once they load; a headless sweep+soak checks throws/leaks/perf.
- Convention followed: `glb_law` (metres, +Y up, base at origin) ✓ every asset measured `minY≈0`;
  `facing` ("Lane B/C rotate directional props") — Lane C now applies per-kind yaw in `glb.js`.

## Result — soak with `useGLB` on (50 rooms, all types)
`throws 0 · pathFail 0 · determinismFail 0 · leakGeo 0 · leakTex 0 · worst build 10.5ms (<50) ·
256 GLB upgrades applied`. **GLB textures/geometries dispose leak-free on room exit** (loader-cached
+ clone-shared; baseline taken after warmup). Acceptance met.

## ✅ Good — live now (5 assets)
| id / file | native (x·y·z m) | notes |
|---|---|---|
| `wire_shelf` · procity_fit_wire_shelf_01.glb | 1.17 · 1.8 · 0.44 | clean, full height, faces right (yaw 0) |
| `clothes_rack` · procity_fit_clothes_rack_01.glb | 1.34 · 1.5 · 0.43 | garments hang correctly, casters read well |
| `bookshelf` · procity_fit_bookshelf_01.glb | 0.2 · 2.0 · 1.02 | **needs +90° yaw** — modelled wide along Z; Lane C rotates it. Then spines face the aisle ✓ |
| `work_table` · procity_fit_work_table_01.glb | 0.44 · 0.75 · 1.04 | **needs +90° yaw** (Z-major); goods sit on top ✓ |
| `cube_shelf_wide` · procity_fit_cube_shelf_wide_01.glb | 0.75 · 1.1 · 1.24 | **needs +90° yaw**. ⚠ 1.24 wide → in narrow (2-col ≈0.84m) cube slots it clamps to ~0.75m tall. Fine in wide slots. Optional: a ~0.8m-wide cube variant. |

Lane C applies the +90° yaw for the three Z-major assets (per the `facing` convention — no action needed
from Lane E unless you want to re-bake them Z-forward). All plant on the floor; no z-fighting with the
procedural stock/decor that rides on top.

## ⚠ Mismatches to fix (2 assets)
1. **`procity_fit_record_crate_01.glb` — BROKEN, will not load.**
   `GLTFLoader.loadAsync` throws `TypeError: Cannot read properties of undefined (reading 'uri')`.
   The file has valid glTF magic and is 858 KB, but references an undefined `uri` (missing embedded
   image/buffer, or an extension the shipping bare `core/loaders.js` GLTFLoader can't resolve — it is
   the **only one of the 16 that fails** that loader; the other 8 fittings + street furniture load fine).
   Impact: record bins/crates fall back to primitives (fail-soft, no crash). **Please re-export** (and if
   it uses KTX2/meshopt, flag it — the core loader has no KTX2/meshopt/Draco decoder configured).
2. **`procity_fit_counter_01.glb` — too large for the interior counter slot; no till.**
   It's a real **4.02 m-long × 1.1 m** counter. Interior counter slots are ~1.4–2.2 m, so fitting to the
   slot squashes it to ~0.6 m tall, and it has no till/register modelled. Lane C therefore **keeps the
   counter primitive** (correct height + till + keeper stand). If you want a GLB counter for interiors,
   a **~2 m-long counter with a till** would drop straight in (re-add `counter` to `KIND_TO_GLB`).

## Notes for Lane E's local-depot mode (your round-3 §2)
When `?localdepot=1` / `core/loaders.js` resolves `depot:<file>` → local, Lane C needs **no change**:
`glb.js` uses `depot:<file>` by default and only used `localBase` as a standalone validation shim. Point
your local resolver at `pipeline/_normalized/` and my `useGLB` path works through it as-is.

Screenshot evidence: [`docs/shots/laneC/glb_validation_grid.jpg`](../shots/laneC/glb_validation_grid.jpg).