# Electronics library manager

Building and maintaining Fusion Electronics libraries: symbols, footprints, and real 3D packages,
generated rather than hand-drawn.

## What a library part needs

A usable Adom part is three things that must agree with each other:

1. a **symbol** (schematic)
2. a **footprint** (the pads the part solders to)
3. a **3D package** (what it looks like on the board)

Get the third one misaligned and the board renders wrong; get the second wrong and it does not
solder.

## Opening and inspecting

```bash
adom-desktop fusion_open_lbr '{"lbrPath":"C:/tmp/AdomBasicParts.lbr"}'
```

`.lbr` is the EAGLE library format Fusion Electronics uses.

## Generating packages

```bash
adom-desktop fusion_generate_package '{"package":"R_4k7", ...}'
```

`fusion_generate_package` builds a parametric IPC package, including laser-etched markings, rather
than drawing pads by hand. IPC-derived geometry is what keeps footprints consistent across a
library.

## 3D packages

```bash
adom-desktop fusion_make_3d_package   '{...}'      # build one
adom-desktop fusion_attach_3d_package '{...}'      # bind it to a footprint
adom-desktop fusion_build_library_3d  '{"lbrPath":"C:/tmp/newlib/AdomBasicParts2.lbr",
                                        "parts":[{"package":"R_4k7",
                                                  "lbrPath":"C:/tmp/newlib/R_4k7.lbr",
                                                  "modelPath":"C:/tmp/newlib/R_4k7.step"}]}'
adom-desktop fusion_capture_library_views '{...}'  # render views for a wiki page
```

`fusion_build_library_3d` is the batch path: hand it a list of parts with their STEP models and it
binds 3D to each package in one pass, returning per-part success plus screenshots.

### The auto-orient rule

Auto-orient used to rotate the **smallest** bounding-box dimension to Z. That is correct for a flat
SMD chip and badly wrong for a tall through-hole machine pin, which ended up lying on its side.

Tall parts now stay vertical: if `dz` is already the largest dimension, the part is left alone and
only flat SMD parts get tipped. If you are adding a part type with unusual proportions, check the
3D orientation before committing it to a library.

## Verifying a part before you commit it

A part that is subtly wrong is worse than a missing one, because it silently produces bad boards.
Check:

- **Pin 1** is where the footprint says it is.
- The **seat plane** is at z=0, so the part sits on the board rather than floating or sinking.
- The 3D body's footprint **matches the pad geometry**.

The `adom-chipfit` tool exists for exactly this and validates a 3D chip GLB against its
`.kicad_mod`: pin-1 alignment, package-family guard, seat-plane delta-z and size match.

## Publish the whole part

When a component gets a wiki page, publish everything: symbol, footprint, 3D model, the source
`.lbr`, and the STEP. Someone else's board depends on being able to use the part, not just look at
it.

## Related

- [3D board view and export](3d-viewer-and-export.md) for the GLB pipeline these models feed.
- [2D board layout](board-layout-2d.md) for how footprints become manufacturing output.