101f3138ce
B1 (api-performance): wire hyper_ideal_hessian_block_fd_sym into newton_hyper_ideal instead of the full-FD path — 33×/1166× faster on cathead/brezel, also fixes the FD-step vs Newton-tol accuracy floor (N1 cross-fix). V3 (input-validation): add isfinite check on all vertex coordinates in load_mesh; NaN/Inf now throws runtime_error at the I/O boundary before poisoning the solver. C1 (test-coverage): expose the internal ok flag via an optional bool* parameter on solve_linear_system so double-solver failure is no longer invisible to callers. +5 new tests (LoadMeshThrowsOnNaN/Inf, OkFlag_True*, OkFlag_NullPointerIsSafe). 282/282 tests pass. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
#pragma once
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// Copyright (c) 2024-2026 Tarik Moussa.
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// SPDX-License-Identifier: MIT
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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 <CGAL/boost/graph/helpers.h>
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#include <string>
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#include <stdexcept>
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#include <cmath>
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namespace conformallab {
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/// Read a polygon mesh from `filename` into `mesh` (clears 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 `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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/// Throwing wrapper around `read_mesh`: returns the mesh by value
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/// or throws `std::runtime_error` on read failure.
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///
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/// Also enforces that the mesh is triangulated, because every functional
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/// in this library assumes triangle faces — a quad/polygon mesh would be
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/// read in silently and then mis-handled by the angle/length formulas.
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/// Fail loudly here at the I/O boundary instead.
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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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if (!CGAL::is_triangle_mesh(mesh))
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throw std::runtime_error(
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"conformallab: mesh from " + filename +
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" is not triangulated (functionals require triangle faces)");
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for (auto v : mesh.vertices()) {
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const auto& p = mesh.point(v);
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if (!std::isfinite(p.x()) || !std::isfinite(p.y()) || !std::isfinite(p.z()))
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throw std::runtime_error(
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"conformallab: non-finite vertex coordinate in " + filename);
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}
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return mesh;
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}
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/// Throwing wrapper around `write_mesh`; throws `std::runtime_error` on
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/// write failure.
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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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