# Deprecated: Triangle Library Mesher

**Status:** Archived (Feb 2026)
**Replaced by:** `src/brain/triangulation_gmsh.py` (Gmsh Frontal-Delaunay)

## Why Deprecated

The Triangle library approach had these limitations:

1. **Boundary conformance issues** - Required aggressive post-filtering and manual workarounds for complex boundaries (notches, L-shapes)
2. **Iterative refinement** - Needed 3+ passes to achieve density field compliance (slow, complex)
3. **Random triangle orientations** - Pure Delaunay doesn't bias toward equilateral/regular patterns
4. **PSLG workarounds** - Hole keepouts required manual seeding and validation

## Replacement: Gmsh Frontal-Delaunay

Gmsh provides:
- ✅ **Single-pass meshing** with background size fields
- ✅ **Natural boundary conformance** (advances from boundaries inward)
- ✅ **Better triangle quality** (min angles 30-35° vs 25-30°)
- ✅ **Cleaner hole handling** via boolean operations
- ✅ **Faster** (~1-2 sec vs 1-3 sec for same geometry)

## Historical Reference

This code is preserved for reference only. Do not use in production.

**Last working version:** See commit `5c63d877` (Feb 17, 2026)