# RP2040 Test Board

An Adom Fusion 360 electronics design (RP2040, SC0914) exported to a wiki-grade 3D model, with the
**copper routing made visible**. Drag to orbit, scroll to zoom.

## Why the traces are an overlay (and are real)

A Fusion **STEP** export does NOT contain the copper trace geometry (Fusion's own 3D PCB view does
not show traces either), so a plain STEP -> GLB shows a bare green board. The traces you see here are
the board's **real top-copper gerber layer** (`GTL`): rendered to an image, framed **exactly to the
board outline** (`Profile` gerber, 23 x 10 mm), and overlaid on the board top with the same
texture-registration used for silkscreen. So this is the actual routing, the QFN fan-out, the ground
pour and the pads, in copper, sitting where they really are on the board.

## Pipeline
1. Fusion electronics design -> export **STEP** + **gerbers**.
2. STEP -> optimized GLB via service-step2glb molecule mode (OCCT tessellation, gold pins, join/weld/prune, Draco).
3. Render the **top-copper gerber** to a copper-colored PNG framed to the outline, overlay it on the board top.

## Board
| Property | Value |
|---|---|
| MCU | RP2040 |
| Outline | 23 x 10 mm |
| Traces | real top-copper gerber, overlaid + registered |
| Source | Fusion 360 electronics design (Main project) |