open-wc/coordination/claims/M03-RND-M2-STATIC-BATCH-MATERIALIZER-001.md

M03-RND-M2-STATIC-BATCH-MATERIALIZER-001

Owner

• Agent ID: sindo-main-codex
• Target: M03 Renderer Facade and Safe Extraction
• Branch: work/sindo-main-codex/m03-m2-static-batch-materializer
• Worktree: C:\Users\sindo\open-wc-worktrees\m03-m2-static-batch-materializer

Outcome

Extract main-thread static M2 MultiMesh construction, render-property setup and batch attachment from StreamingWorldLoader.

Non-goals

• Change M2 grouping, batch sizing, build cursors, budgets or retry behavior.
• Change Mesh loading, refresh, cache ownership or missing-model outcomes.
• Own animated M2 instances, Editor persistence or tile cleanup.
• Introduce spatial cells or change transform order, visibility or shadows.

Paths

• Exclusive: src/render/m2/m2_static_batch_materializer.gd, src/tools/verify_m2_static_batch_materializer.gd, docs/modules/m2-static-batch-materializer.md, this claim
• Shared/hotspots: src/scenes/streaming/streaming_world_loader.gd, M2 build/ Mesh-cache/facade/internal-access/manifest verifiers and specs, docs/modules/world-renderer.md, docs/modules/README.md, RENDER.md, targets/03-renderer-facade.md
• Generated/ignored: .godot, native DLL, generated resources/caches and proprietary corpus

Contracts and data

• MultiMesh.TRANSFORM_3D, exact Mesh identity, instance count and transform slice order remain unchanged.
• Batch node name remains model basename plus serial.
• Visibility end/margin and shadow setting remain exact renderer inputs.
• A valid batch attaches once to the supplied M2 parent and returns its node.
• Loader retains Editor-owner assignment, build cursor, budgets and retries.

Dependencies

• Requires: accepted animated materializer package on master 86814de
• Blocks: further M2 build-job orchestration extraction
• External state: Godot MultiMesh and SceneTree mutation remain main-thread APIs

Verification

• Commands: dedicated invalid/name/mesh/count/order/render/attachment/source/timing verifier; M2 build/cache/prototype/animated/shutdown/material/facade/internal- access/manifest regressions; docs/coordination/dry-run gates
• Fixtures: synthetic ArrayMesh and ordered Transform3D slices
• Fidelity evidence: exact existing MultiMesh construction and render settings
• Performance budget: materialize 10,000 transforms under one second

Documentation deliverables

• Inline API docs
• Module spec with inputs/outputs, ownership and source map
• Data-flow, lifecycle/state, sequence and dependency diagrams
• Adjacent build/cache/world-renderer/module-registry/RENDER updates

Simplicity and naming

• Important name introduced: M2StaticBatchMaterializer
• Simplest solution: synchronous main-thread RefCounted returning attached node
• Rejected complexity: signals, async queue, callbacks and generic materializer base
• Unavoidable complexity: MultiMesh is a Godot Resource owned through its node
• Measured optimization evidence: bounded synthetic transform upload

Status

• State: active
• Done: contract and ownership boundary
• Next: implementation, verification and documentation
• Blocked by:

Handoff

• Commit:
• Results:
• Remaining risks:
• Documentation updated: