e70689d29f
Phase 4a — newton_solver.hpp:
- newton_euclidean(): SimplicialLDLT on H (PSD); solves H·Δx = −G
- newton_spherical(): SimplicialLDLT on −H (NSD→PSD); solves (−H)·Δx = G
- Backtracking line search (halving α up to 20×) for global convergence
- NewtonResult struct: x, iterations, grad_inf_norm, converged
- 7 tests: 4 spherical (convergence, few iters, large perturbation,
field consistency) + 3 Euclidean (triangle pinned, quad pinned,
mixed pinned — all with natural-theta equilibrium at x=0)
Phase 4b — mesh_io.hpp:
- read_mesh() / write_mesh(): CGAL::IO::read/write_polygon_mesh wrappers
- load_mesh() / save_mesh(): throwing convenience versions
- Supports OFF, OBJ, PLY (format detected by file extension)
- 6 tests: OFF round-trip (tet + quad), OBJ round-trip, missing-file throw,
vertex-position preservation, save/load convenience wrappers
All 75 cgal tests pass (3 skipped as before).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
#pragma once
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// mesh_io.hpp
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//
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// Phase 4b — CGAL::IO wrappers for ConformalMesh.
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//
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// Reads and writes ConformalMesh (CGAL::Surface_mesh) in standard polygon-mesh
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// formats using the CGAL Polygon Mesh I/O utilities (CGAL 5.4+).
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//
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// Supported formats (detected by file extension):
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// .off — Object File Format (read + write)
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// .obj — Wavefront OBJ (read + write)
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// .ply — Polygon File Format (read + write)
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//
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// Usage:
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// ConformalMesh mesh;
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// if (!read_mesh("input.off", mesh)) throw std::runtime_error("read failed");
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// // ... process mesh ...
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// write_mesh("output.off", mesh);
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//
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// Note: property maps (lambda0, v_idx, etc.) are NOT serialised — they must
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// be re-initialised with setup_*_maps() + compute_lambda0_from_mesh() after
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// reading a file.
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#include "conformal_mesh.hpp"
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#include <CGAL/IO/polygon_mesh_io.h>
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#include <string>
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#include <stdexcept>
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namespace conformallab {
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// ── Read ──────────────────────────────────────────────────────────────────────
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//
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// Reads a polygon mesh from file into `mesh` (clears any existing content).
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// Returns true on success, false on failure.
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inline bool read_mesh(const std::string& filename, ConformalMesh& mesh)
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{
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mesh.clear();
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return CGAL::IO::read_polygon_mesh(filename, mesh);
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}
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// ── Write ─────────────────────────────────────────────────────────────────────
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//
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// Writes `mesh` to `filename`. Returns true on success.
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inline bool write_mesh(const std::string& filename, const ConformalMesh& mesh)
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{
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return CGAL::IO::write_polygon_mesh(filename, mesh);
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}
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// ── Convenience: throwing wrappers ────────────────────────────────────────────
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inline ConformalMesh load_mesh(const std::string& filename)
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{
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ConformalMesh mesh;
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if (!read_mesh(filename, mesh))
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throw std::runtime_error("conformallab: failed to read mesh from " + filename);
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return mesh;
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}
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inline void save_mesh(const std::string& filename, const ConformalMesh& mesh)
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{
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if (!write_mesh(filename, mesh))
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throw std::runtime_error("conformallab: failed to write mesh to " + filename);
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}
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} // namespace conformallab
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