Extend the export manager to support STL and OBJ formats in addition to
the existing GLB export. Uses Three.js built-in STLExporter and
OBJExporter - no new dependencies.
STL is the standard format for 3D printing. OBJ is widely used in
rendering pipelines and supports basic materials. Both are requested
in the community discussion on #145.
Changes:
- export-manager.tsx: add STLExporter and OBJExporter, accept format param
- settings-panel: three format-specific export buttons (GLB, STL, OBJ)
- use-viewer store: update exportScene type to accept optional format
The format parameter defaults to 'glb', so existing callers (command
palette) continue to work without changes.
Relates to #145
Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
