sindoring
f68e971cce
Work-Package: M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001 Agent: sindo-main-codex Tests: 36 headless regressions, checkpoint dry-run, documentation and coordination gates pass Fidelity: traversal/lifetime extraction only; asset-backed visual parity remains unclaimed
101 lines
4.0 KiB
Markdown
101 lines
4.0 KiB
Markdown
# M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001 — M2 mesh resource extractor
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<!-- OPENWC_CLAIM:M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001:sindo-main-codex:2026-07-20 -->
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## Ownership
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- Target: M03
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- Program: RND
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- Owner/Agent ID: sindo-main-codex
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- Branch: `work/sindo-main-codex/m03-m2-mesh-resource-extractor`
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- Lease expires UTC: 2026-07-20
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- Integrator: M03 milestone integrator
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## Outcome
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Extract first-Mesh selection from loaded M2 Resources and Node subtrees,
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including temporary PackedScene instance cleanup, from `StreamingWorldLoader`.
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## Non-goals
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- Call ResourceLoader or select/request cache paths.
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- Refresh/rebuild materials or load raw M2 data.
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- Own the Mesh cache, missing state, prototypes or MultiMesh materialization.
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- Change traversal order, cache formats, profiles or visible behavior.
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## Paths
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- Exclusive: `src/render/m2/m2_mesh_resource_extractor.gd`,
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`src/tools/verify_m2_mesh_resource_extractor.gd`,
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`docs/modules/m2-mesh-resource-extractor.md`, this claim
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- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`,
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M2 pipeline/cache/material/shutdown verifiers, `docs/modules/world-renderer.md`,
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`docs/modules/README.md`, M2 module specs, `RENDER.md`,
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`targets/03-renderer-facade.md`
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- Generated/ignored: `.godot`, native DLL, generated M2 resources, caches and
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proprietary renderer corpus
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## Contracts and data
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- A direct Mesh Resource returns the same Mesh reference.
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- A PackedScene is instantiated once, searched depth-first in child order and
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its temporary root is freed before return.
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- A Node subtree search returns the first MeshInstance3D Mesh in historical
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depth-first preorder without changing the tree.
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- Null, unsupported Resources and subtrees without a Mesh return null.
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## Dependencies
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- Requires: accepted Mesh resource cache package on master `5e2afbc`
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- Blocks: isolated material refresh/rebuild finalizer extraction
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- External state: none; verification uses synthetic Mesh/Node/PackedScene fixtures
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## Verification
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- Commands: dedicated direct/PackedScene/subtree/order/lifetime/source/timing
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verifier; M2 pipeline/cache/classifier/material/shutdown/build/facade/internal-
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access/manifest, documentation and coordination gates
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- Fixtures: ArrayMesh, MeshInstance3D subtrees and synthetic PackedScene
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- Fidelity evidence: exact traversal order and temporary-node destruction
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- Performance budget: 10,000 synthetic subtree lookups under 1 second
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## Documentation deliverables
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- Inline public API docs
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- Module specification with inputs/outputs, ownership and source map
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- Data-flow, lifecycle/state, sequence and dependency diagrams
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- M2 cache/pipeline, world-renderer, registry and RENDER updates
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## Simplicity and naming
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- Important name introduced: `M2MeshResourceExtractor`
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- Simplest solution: one stateless RefCounted with two explicit extraction APIs
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- Rejected complexity: callback-driven finalizer, generic scene utility,
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cache ownership, signals or visitor framework
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- Unavoidable complexity: temporary PackedScene instance must be freed while
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its referenced Mesh remains borrowed
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- Measured optimization evidence: bounded synthetic depth-first traversal
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## Status
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- State: ready
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- Done: extractor, three loader/test adapters, contract verifier and required documentation
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- Next: integrator merge and post-merge smoke
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- Blocked by:
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## Handoff
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- Commit: `7b0e1ea`
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- Results: extractor passes direct/PackedScene/subtree/order/lifetime contracts
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and 10,000 traversals in 39.243 ms; 36 headless renderer/coordinate
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regressions pass; checkpoint dry-run passes 7/7; documentation and
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coordination gates pass.
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- Remaining risks: synchronous PackedScene instantiation remains behind the
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existing permit; no private M2 corrupt-scene/traversal/leak/p95/p99 or
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original-client comparison; material preparation remains loader-owned.
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- Documentation updated: inline API; `m2-mesh-resource-extractor.md` with
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data-flow, lifecycle, sequence and dependency diagrams; cache/pipeline specs,
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module registry, `world-renderer.md` and `RENDER.md`.
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<!-- OPENWC_HANDOFF:READY:M03-RND-M2-MESH-RESOURCE-EXTRACTOR-001:7b0e1ea -->
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