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evo-stl-binary-parser

Parses binary STL files using Python's struct module, extracting triangle vertices, normals, and the 2-byte attribute byte count (used as Material ID). Provides filtering by Material ID and density table parsing.

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

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Sep 10, 2026
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# evo-stl-binary-parser

Parses binary STL files and material density tables.

## Key Functions

- `parse_binary_stl(filepath)` - Parse binary STL, returns list of (v1, v2, v3, material_id) tuples
- `parse_material_density_table(filepath)` - Parse markdown density table, returns {id: density} dict
- `filter_facets_by_material_id(triangles, material_id)` - Filter triangles by material
- `detect_material_id(triangles)` - Find dominant material ID (excluding debris ID=1)
- `lookup_density(material_id, density_table=None)` - Look up density from table

## Usage