2D Layout — Architectural Drawings from Compiled BOM¶
Module:
2D_Layout/(Maven sibling of DAGCompiler) · Source spec:2D_Layout/docs/2D_ARCHITECTURAL_LAYOUT.md
Status: POC complete on Sample House. Java stubs + Python prototype. Floor plan SVG generated.
What It Does¶
Generates professional architectural drawings from the compiled 3D output:
compiled output.db → section cut → SVG floor plan / elevation / section / roof plan
The same output.db that feeds 4D–8D queries also produces 2D architectural drawings. No separate drawing tool. No manual drafting. The 3D model IS the drawing — sliced at the right plane.
Visual Proof — Sample House¶
The 3D compiled model (Bonsai/Blender viewport):
SH compiled from BOM recipe. Glass curtain wall meets pitched roof — the TRIM verb adjusts wall panels at the roof intersection. Every element traces to component_library.db via G5-PROVENANCE.
The 2D floor plan — generated from the same compiled output.db:
Pelan Lantai (Floor Plan): horizontal section cut at 1.2m above floor level. Walls, doors, windows, furniture — all from the compiled BOM. Room labels (Ruang Tamu, Ruang Makan, Bilik) from M_Product_Category names. Grid lines and dimensions from AABB extents. Title block follows JKR/ISO convention.
The 2D roof plan — generated from the same compiled output.db:
Pelan Bumbung (Roof Plan): top-down projection showing ridge lines (Cumbung Sana, Cumbung Sini), slope direction arrows, and drainage layout. Generated from the same BOM tree — the roof is an M_BOM with TILE verb expansion.
The architect's original roof plan — the ground truth we compile against:
The architect's hand-drawn roof plan (scale 1:100). Grid lines A-E, levels 1-5, material hatching, drainage symbols, legend. The compiler-generated version above reproduces the spatial layout from BOM data alone — no manual drafting.
Why It Matters for the ERP Paradigm¶
In construction, 2D drawings are still the legal deliverable — the document the contractor builds from, the regulator stamps, the QS prices. Most BIM tools treat 2D as an afterthought (export to DWG, clean up manually).
Here, 2D drawings are a query on the compiled BOM — the same data that produces 5D cost and 6D carbon also produces the floor plan. One source of truth, multiple views:
| View | Method | What it shows |
|---|---|---|
| Floor plan | Horizontal section cut at 1.0–1.2m above floor level | Walls, doors, windows, furniture |
| Elevation | Orthographic projection onto vertical plane | Exterior appearance, roof profile |
| Section | Vertical section cut through building | Internal structure, wall composition |
| Roof plan | Top-down view | Ridge lines, slopes, drainage |
The Round-Trip Proof¶
1D BOM recipe → 3D compilation → 2D drawing → back to BOM verification
The floor plan and roof plan above were generated from this pipeline. Compare the compiler-generated roof plan against the architect's original — the spatial layout matches. If the 2D drawing reproduces the architect's intent from BOM data alone, the BOM grammar is proven from yet another angle.
This is the Rosetta Stone principle applied to drawings: the architect's original is the stone, the compiler-generated drawing is the translation. Match = proof.
How It Connects¶
| Dimension | Role |
|---|---|
| 3D | Source geometry — compiled element meshes from output.db |
| 2D | Derived views — section cuts, projections, annotations |
| 4D | Construction sequence overlaid on floor plans |
| 5D | QS takeoff reads the same elements the drawing shows |
| 7D | Facility management drawings from the same compiled model |
| AD_PrintFormat | iDempiere's output selection pattern — which elements render, which hide |
Current State¶
| Deliverable | Status | Evidence |
|---|---|---|
| Floor plan (SH) | POC — SVG generated from mesh section cut | See Pelan Lantai above |
| Roof plan (SH) | POC — SVG generated from top-down projection | See Pelan Bumbung above |
| Elevations | Designed — no ceiling overlap, level markers | SVGs in 2D_Layout/archive/ (front, rear, left, right) |
| Sections | Stub — hatching per material pending | — |
| Annotations | Designed — grid lines, dimensions, room labels | Visible in floor plan |
| Java port | 6 stub classes created, Python prototype as reference | 2D_Layout/src/main/java/com/bim/layout/ |
Source¶
Module: 2D_Layout/ in BIMCompiler repository.
See 2D_Layout/docs/2D_ARCHITECTURAL_LAYOUT.md for the full technical spec
(mesh section cut algorithm, annotation overlay, JKR/ISO conventions).
SVG archive: 2D_Layout/archive/ contains generated floor plan, roof plan,
and 4 elevation SVGs for the Sample House.