Export Pipeline (3MF / OBJ / Presets)

Status: placeholder — content pending. Fill freely in English or 中文.

Scope

From painted labels to slicer-ready files:

flowchart TD
    LC["region labels + palette colours"] --> Q["colour quantize<br/>(≤256 for OBJ)"]
    Q --> X1["3MF<br/>XML · Materials & Colors extension<br/>machine_settings_1.config · ZIP"]
    Q --> X2["OBJ + MTL<br/>usemtl groups = per-face colour"]
    PR["resources/presets/snapmaker_u1.json<br/>(include_str, generated by extract_orca_presets.py)"] --> X1
    X1 --> SL["Snapmaker Orca / OrcaSlicer<br/>multi-filament import"]
    X2 --> SL

Topics to cover: the 3MF XML anatomy (object/model, colour attributes, embedded machine settings so slicers show Snapmaker U1 (0.4 nozzle) without vendor profiles installed); preset generation (tools/extract_orca_presets.py — whitelisted vendors + inherits chain flattening, compiled in via include_str!); the export dialog (machine → nozzle → process → filament slots → target slicer, multi-region selection + apply-all, persisted last selection); OBJ per-face colours as MTL groups quantized to ≤256 colours; verification record in ../04 P0-4 (Snapmaker Orca, 2026-08-27).

Code pointers

• src-tauri/src/export/{threemf,obj,presets,quantize,paint_color,project_config}.rs
• src-tauri/src/commands/export.rs
• src/components/ExportDialog/
• tools/extract_orca_presets.py · tools/verify_3mf.py

TODO

• 3MF XML anatomy (namespaces, colour attributes) with a real sample
• Quantization strategy (when 256 colours is / isn't enough)
• Preset regeneration workflow (extract_orca_presets.py)