# BIM Coordination Sandbox Validation Report

Generated: 2026-06-03T20:57:48.410517+00:00

## Portfolio argument

Static CAD/BIM files are not enough for facility digital-twin work; the useful artifact is a reviewable coordination layer where source BIM elements, tool/equipment keepout zones, and validation issues can be inspected together.

This report is the evidence package for that argument: public IFC source metadata, extracted BIM entity/product records, deterministic proxy clearance checks, and an OpenUSD-style coordination layer that can sit beside the Smart Warehouse CAD-to-SimReady scene.

## Claim boundary

This is a portfolio MVP for BIM/VDC coordination workflow proof. It extracts IFC element metadata, assigns deterministic proxy AABBs when native geometry is unavailable, validates representative fab-style equipment clearances, and exports an ASCII USDA-like layer. It is not a production clash signoff model, not a semiconductor fab BIM model, and not a claim of production Revit/Navisworks ownership. The public buildingSMART fixture is generic architecture, so room/space names may appear beside fab-style mockups; that mismatch is intentional test-data framing, not a fab model claim.

## Source

- IFC path: `data/bim/public_fixtures/Building-Architecture.ifc`
- Source type: `public_open_data_download`
- License / boundary: buildingSMART Sample-Test-Files, CC BY 4.0
- URL: https://raw.githubusercontent.com/buildingSMART/Sample-Test-Files/main/IFC%204.0.2.1%20%28IFC%204%29/PCERT-Sample-Scene/Building-Architecture.ifc

## Parsed BIM hierarchy / element metadata

- Parser mode: `regex_step_text_fallback`
- IFC entity types counted: 65
- Product-like elements extracted: 14
- Proxy elements exported/validated: 14

Top IFC entity counts:

| Entity | Count |
|---|---:|
| IFCDIRECTION | 50 |
| IFCCARTESIANPOINT | 36 |
| IFCPROPERTYSINGLEVALUE | 34 |
| IFCAXIS2PLACEMENT3D | 24 |
| IFCLOCALPLACEMENT | 22 |
| IFCRELDEFINESBYPROPERTIES | 19 |
| IFCRELDEFINESBYTYPE | 16 |
| IFCPRODUCTDEFINITIONSHAPE | 14 |
| IFCSHAPEREPRESENTATION | 14 |
| IFCSTYLEDITEM | 14 |
| IFCPROPERTYSET | 13 |
| IFCCARTESIANPOINTLIST3D | 12 |
| IFCTRIANGULATEDFACESET | 12 |
| IFCQUANTITYLENGTH | 11 |
| IFCCOLOURRGB | 10 |
| IFCSURFACESTYLE | 10 |
| IFCSURFACESTYLERENDERING | 10 |
| IFCMATERIAL | 9 |
| IFCRELASSOCIATESMATERIAL | 9 |
| IFCPROPERTYENUMERATEDVALUE | 8 |

## Clearance / clash validation

- Fab equipment mockups: 3
- Issues detected: 12
- Validation basis: deterministic AABB proxies by IFC category. Native BIM geometry can replace this layer later without changing the report schema.

| Issue | Severity | Type | Equipment | BIM element | Distance m |
|---|---|---|---|---|---:|
| ISSUE_001 | high | physical_intersection | FAB_TOOL_EUV_SCANNER_PROXY | floor (IFCSLAB) | 0.0 |
| ISSUE_002 | high | physical_intersection | FAB_TOOL_EUV_SCANNER_PROXY | living room (IFCSPACE) | 0.0 |
| ISSUE_003 | high | physical_intersection | FAB_TOOL_EUV_SCANNER_PROXY | plumbing wall (IFCWALL) | 0.0 |
| ISSUE_004 | high | physical_intersection | FAB_TOOL_EUV_SCANNER_PROXY | house - roof - slab left (IFCSLAB) | 0.0 |
| ISSUE_005 | medium | clearance_keepout_violation | FAB_TOOL_EUV_SCANNER_PROXY | house - roof - slab right (IFCSLAB) | 0.21 |
| ISSUE_006 | medium | clearance_keepout_violation | FAB_TOOL_WET_BENCH_PROXY | floor (IFCSLAB) | 0.88 |
| ISSUE_007 | high | physical_intersection | FAB_TOOL_WET_BENCH_PROXY | living room (IFCSPACE) | 0.0 |
| ISSUE_008 | high | physical_intersection | FAB_TOOL_WET_BENCH_PROXY | Group#18 (IFCBUILDINGELEMENTPROXY) | 0.0 |
| ISSUE_009 | high | physical_intersection | FAB_TOOL_WET_BENCH_PROXY | entry hall (IFCSPACE) | 0.0 |
| ISSUE_010 | high | physical_intersection | FAB_TOOL_WET_BENCH_PROXY | house - roof - slab left (IFCSLAB) | 0.0 |
| ISSUE_011 | high | physical_intersection | FAB_TOOL_WET_BENCH_PROXY | house - roof - slab right (IFCSLAB) | 0.0 |
| ISSUE_012 | high | physical_intersection | AMHS_STOCKER_PROXY | living room (IFCSPACE) | 0.0 |

## Evidence interpretation

- `element_summary.json` is the source/hierarchy evidence: it records the public IFC source, license boundary, parser mode, IFC entity counts, product-like elements, GlobalIds/names, and proxy bounding boxes.
- `clashes.json` is the coordination evidence: it records representative fab equipment envelopes, issue IDs, issue severity/type, affected BIM element, and clearance distance.
- `bim_coordination_layer.usda` is the spatial integration evidence: it carries BIM proxy elements, fab clearance proxies, and issue markers in a layer that can be composed or visualized beside the Smart Warehouse scene.

## OpenUSD / portfolio integration

The generated `bim_coordination_layer.usda` is a lightweight coordination overlay with BIM proxy boxes, fab equipment envelopes, and red issue markers. It can be composed beside the Smart Warehouse CAD-to-SimReady scene as a review layer: CAD/SimReady assets provide high-fidelity equipment visuals, while this BIM layer supplies building context, element identity, and clearance issue metadata.

Suggested portfolio section title: `BIM/VDC Extension: IFC-to-validated facility coordination layer`.

## Next production steps

1. Replace proxy AABBs with ifcopenshell geometry, xbim, or authoring-tool exported bounding boxes.
2. Map IFC storey/space containment into USD collections for review filtering.
3. Attach issue records to USD prim customData and feed BCF-style coordination tickets.
4. Compose with Smart Warehouse CAD-to-SimReady OpenUSD assets for tool installation sequencing.