Choose a clear floor plan

The parser works best when it can trace walls, doors, and room boundaries directly from the image.

Good input

Flat 2D floor plan

Clear black-and-white top-down library floor plan with visible walls, doors, rooms, and furniture

Straight-on, top-down view of one floor.
Sharp, high-contrast walls and door openings.
A readable room layout with little decorative clutter.

Bad input

Perspective or 3D render

Perspective 3D render of a convention center with angled walls, shadows, and overlapping spaces

Angled perspective distorts distances and wall geometry.
Roofs, shadows, and objects hide room boundaries.
Several halls or levels are shown at once.

Rule of thumb: if you can trace every wall and doorway from directly above, it is likely a good input.