SimReady Conform FET-001 Minimal

Purpose

Use this workflow skill after FET000CORE passes and the next profile validation gate is FET001BASE_NEUTRAL. It brings an existing USD asset toward the Minimal/Base Neutral feature contract while preserving visual scale, hierarchy intent, and source traceability.

This is an authoring and repair skill, not the final validator. Work on a staged copy under the requested output directory, rerun the same validation gate after each repair stage, and stop at the first remaining failing FET001 validation gate.

Prerequisites

Read the source-of-truth files named below before editing. Work on staged outputs where the skill requires them, and keep validation evidence with the result.

Source of Truth

Before changing an asset, load the exact FET001 manifest selected by the profile:

• nvcore/srspecs/docs/features/FET001base_neutral-0.1.0-minimal.json
• nvcore/srspecs/docs/features/FET001base_neutral-1.0.0-minimal.json
• nvcore/srspecs/docs/features/FET_001-minimal.md

Some profiles select FET001BASE[email protected], while newer profiles may select 1.0.0. Treat the JSON manifest requirement list as authoritative for the selected profile/version.

For per-requirement repair details, read references/fet001-requirements.md when a FET001 validation report or inspection identifies matching failures.

Inputs

Collect these before editing:

Instructions

Use this checklist when changing the repository:

1. Confirm the input asset exists and that FET000_CORE is already passing on the same staged asset. If Core still fails, hand back to simready-foundation-conform-fet-000-core first.
2. Parse the validation report and filter to FET001BASENEUTRAL failures. Do not repair later profile features in this skill.
3. Load the selected FET001 manifest version and the requirement repair map.
4. Create a staged output folder under output_root; do not mutate the source unless the user explicitly asks for in-place repair.
5. Run or inspect minimum USD metadata: stage openability, default prim, root prims, upAxis, metersPerUnit, composed bounds, mesh/geometry counts, authored references, and used layers.
6. Apply deterministic fixes in this order:

- Atomic asset/file fixes for AA.001 and AA.002. - Hierarchy fixes for HI.001, HI.003, and HI.004. - Unit and orientation fixes for UN.001, UN.002, UN.006, and UN.007. - Minimal visual geometry fixes for VG.001 or VG.MESH.001. - Mesh quality fixes for VG.002, VG.014, VG.027, VG.028, and VG.029. - Origin placement fixes for VG.025 only when the asset placement convention is clear.

1. Rerun the same profile validation gate, or the narrowest available FET001 validation gate.
2. Summarize the stage as passed, failed, skipped, or blocked. Stop when FET001 passes or the next FET001 failure requires upstream conversion, source geometry, or user intent.

Unit Repair Policy

Treat UN.007 with extra care. Setting metersPerUnit = 1.0 without adjusting authored coordinates can change the apparent physical size of an asset.

Default policy:

• Preserve physical size.
• Record the original metersPerUnit, composed bounds, default prim, and root transforms before editing.
• If the asset uses millimeters, such as metersPerUnit = 0.001, normalize to meter units by scaling authored linear data by 0.001 or by applying an equivalent root-scale normalization in the same staged USD file.
• Recompute authored extents after any geometry-space rescale.
• Validate that the composed bounds in meters are unchanged within a small tolerance.

Prefer these approaches in order:

For any asset with metersPerUnit = 0.001, a size-preserving single-file repair can set metersPerUnit = 1.0 and author root op xformOp:scale:meter_normalization = (0.001, 0.001, 0.001), assuming the root transform is otherwise safe to modify.

Examples

Example request:

Repair FET001_BASE_NEUTRAL minimal stage failures on a staged USD asset.

Expected result summary:

staged_asset: repaired copy or output directory
validation: selected feature/profile gate and report path
remaining_failures: next failing requirement IDs, if any

Repair Policy

Make automatic repairs only when the result is mechanical and locally verifiable:

• Set missing upAxis to Z when the asset is already visually Z-up or when the selected profile requires Z-up.
• Set defaultPrim to the single root prim when there is exactly one valid root.
• Wrap multiple roots under a new Xform only when all asset content can be moved or referenced without breaking paths.
• Convert search paths to anchored relative paths only after the dependency is inside the staged asset root.
• Author extents using USD-computed bounds for local editable meshes.
• Normalize or generate mesh normals only when the intended smoothing can be inferred or the converter already produced enough topology to compute them deterministically.
• If adding a root-scale normalization, check for existing root xform ops first. If the root already has meaningful transform ops, preserve order and semantics or use data-space rescaling instead.

Block and report instead of guessing when:

• The feature failure comes from missing or non-mesh geometry that requires upstream conversion.
• Unsupported file types require lossy texture/audio/geometry conversion.
• Winding, normal direction, or origin placement cannot be inferred from local geometry.
• Rescaling would require editing external layers that are not staged with the asset.
• A unit wrapper or payload layout causes FET000_CORE or AA.001 to regress.

Validation Handoff

Preserve reports under the staged output directory. If the Physical AI Skill Hub validation commands are available, use:

uv run --python 3.12 validate-usd-minimum <staged-usd> \
  --report <output-root>/minimum-usd-after-fet001.json

uv run --python 3.12 validate-simready-profile <staged-usd> \
  --profile <profile> \
  --profile-version <version> \
  --foundation-root <simready-foundation-root> \
  --foundation-spec-root <simready-foundation-root>/nv_core/sr_specs/docs \
  --report <output-root>/simready-profile-after-fet001.json

Count this skill as successful when FET001BASENEUTRAL passes, even if the full profile still fails on later features such as rigid bodies, multibody physics, or grasp vectors. Report those remaining failures as handoff work for their own skills.

Limitations

• Do not silently mutate the source asset; work on the requested staged output.
• Do not hide later profile failures after the selected feature gate passes or fails.
• Do not invent geometry, metadata, or runtime behavior that conflicts with the asset intent.

Troubleshooting

• Error: validation tooling is unavailable. Solution: run the narrowest available USD or static check and report the gap.
• Error: a repair would change asset intent. Solution: stop and ask for direction or stage the smallest reversible edit.
• Error: later profile gates still fail. Solution: report the next failing feature and hand off to the matching conformance skill.

Resources

• assets/openai.yaml preserves optional UI metadata for clients that read skill display hints. It is not required for the workflow.
• references/ contains detailed requirement notes; load only the files needed for the active validation failure.

Summary Format

Report:

Keep the user-facing summary short: what was fixed, whether the asset scale was preserved, what FET001 result validation reported, and the first remaining validation gate.