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evo-3d-scan-calc

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Complete pipeline for binary STL parsing, connected component extraction, volume computation, material density lookup, and mass calculation with JSON output.

tasks-evolved/3d-scan-calc/environment/skills/evo-3d-scan-calc/SKILL.md

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Sep 10, 2026
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Apache-2.0

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# evo-3d-scan-calc

End-to-end skill for computing the mass of a 3D printed part from a binary STL scan file.

## Pipeline Overview

1. **Parse binary STL** — Decode 80-byte header, 4-byte triangle count, and 50-byte facet records. Extract vertices and Material ID (uint16 attribute field) per triangle.
2. **Find connected components** — Build vertex-based adjacency (triangles sharing any vertex are connected) using vertices quantized to **4 decimal places**. BFS to find all components.
3. **Select main part** — Compute volume for each component. The **largest by volume** is the main part.
4. **Extract Material ID** — Use the attribute from the **first triangle** of the largest component.
5. **Lookup density** — Reference the material density table: `{1: 0.10, 10: 7.85, 25: 2.70, 42: 5.55, 99: 11.34}`.
6. **Calculate mass** — `mass = volume * density`. **No unit conversion needed** (density table matches mesh coordinate units).
7. **Write report** — Save JSON with `main_part_mass` and `material_id`.