CAD-to-Floorplan Parsing

Turning non-standard CAD floorplans into unified structured data.

CAD-to-Floorplan Parsing

An automatic DXF/DWG parsing pipeline that uses existing manually drawn CAD floorplans, resolves inconsistent drawing conventions, and generates a unified floorplan data representation.

DXF/DWGLegacy CADRoom PartitioningDoor & Window RecognitionFloorplan JSON

Problem

Many existing CAD floorplans were manually drawn without a unified standard. Different files use different layer structures, drawing conventions, line types, block definitions, units, and wall/door/window representations. To make use of this accumulated data, the system needs to parse DXF/DWG drawings automatically and convert them into a consistent floorplan format.

Approach

Automatically parse DXF/DWG geometry, layers, linework, blocks, and units into a normalized geometric representation.
Separate indoor and outdoor regions, recover the exterior boundary, and partition the floorplan into room-level regions.
Recognize walls, windows, doors, door blocks, and furniture/noise using geometry, topology, layer cues, and rule-based inference.
Generate a unified floorplan data structure suitable for downstream reconstruction, measurement, editing, and product workflows.

My Contribution

I personally designed the complete algorithm framework and implemented the full CAD-to-floorplan parsing system from scratch.

The main modules I built include:

DXF/DWG parsing and normalization across inconsistent CAD conventions
Automatic layer parsing and geometry cleanup
Indoor/outdoor classification and room partitioning
Door, window, and door-block recognition
Furniture recognition/filtering to reduce drafting noise
Unified floorplan JSON generation

Outcome

The parser converts inconsistent manually drawn CAD floorplans into unified structured floorplan data without requiring manual layer cleanup or a single fixed drafting standard.

CAD-to-floorplan parsing pipeline — Parsing pipeline from DXF to structured floorplan data.

Floorplan region graph — Region graph used for structural inference.

CAD-to-floorplan result for compact rectangular apartment — End-to-end result on a compact rectangular floorplan.

CAD-to-floorplan result for multi-room apartment with curved balcony — Multi-room example with curved balcony geometry.

CAD-to-floorplan result for three-room layout with multiple doors — Three-room layout with multiple door openings.

CAD-to-floorplan result for non-orthogonal exterior walls — Non-orthogonal exterior boundary and angled wall example.