acdream/docs/research/2026-07-24-slice-b-full-bake-report.md

Slice B full-bake report

Date: 2026-07-24
Measured binary: 90bf6bbf455654dd1cfe1749b19bfd36b769939c
Result: pass, zero extraction failures

Slice B replaces the failed 865 GB per-cell bake with a deterministic, content-identity package. The client does not consume this package yet; this is the offline prepared-content foundation for Slice C.

Full installed-DAT result

Measure	Result
GfxObj keys	15,318
Setup keys	5,935
EnvCell keys	729,888
Unique EnvCell geometries	17,117
EnvCell aliases	712,771
EnvCell deduplication	42.6×
Physical blobs	38,370
Total TOC keys	751,141
Failures	0
Extract + write	81.2 seconds
Validate + atomic publish total	81.4 seconds
Artifact size	29,561,864,760 bytes (28,192.4 MiB)
Peak working set	5,073.7 MiB
Peak private bytes	4,507.3 MiB

The memory figures belong to the short-lived offline bake process while it constructs and serializes 28.2 GiB of immutable payloads. They are not expected client residency: the later runtime source memory-maps the package and deserializes only demanded assets. Sixteen-result extraction batches and immediate rejection of already-written side-staged meshes keep live bake graphs bounded; 13,284 redundant particle-preload results were discarded without retention.

The header carries format version 1, bake-tool version 2, and source DAT iterations portal 2072, cell 982, high-res 497, language 994. Validation opened the completed temporary package, checked those values, strict TOC ordering, all 751,141 physical ranges, and then published with a same-volume atomic overwrite move. No temporary artifact remained.

Identity correction discovered by the gate

The first guarded full catalog stopped on a real collision in WorldBuilder’s 31× polynomial:

• Cell 0x00030175: environment 0x277, structure 0, surfaces 0x013B, 0x0034.
• Cell 0x01BC0105: environment 0x276, structure 0, surfaces 0x04FC, 0x0034.
• Both legacy identities: 0x00000002020E8C13.

Those cells have different vertices and polygons. Silently aliasing them would render the wrong room. Runtime and bake now share a namespaced FNV-1a identity over the complete typed tuple, while the catalog still compares full tuples and fails loudly on any future collision. The legacy calculation remains as a conformance test proving this exact installed-DAT case.

Alias and determinism gates

A sampled physical receipt at offset 16170873792 is shared by 25 EnvCell keys across multiple landblocks. Eight of those keys were baked independently with one and eight workers. Each output contained eight keys backed by one physical blob, and both files were byte-identical:

C8187761ED30CE9412C9081F52067159AECA5B02EB316E73DA29DC88D4339642

The generated full pak remains an untracked machine artifact and is deleted after final verification. The machine-readable, path-free evidence is 2026-07-24-slice-b-full-bake-report.json.

Release build passed with 17 pre-existing test-source warnings. The complete Release suite passed 8,059 tests with five skips and zero failures. The generated full and filtered pak artifacts were then deleted as required.