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fix(solver+io): B1 block-FD Hessian, V3 NaN/Inf guard, C1 ok-flag (audit quick-wins)

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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>
This commit is contained in:
Tarik Moussa
2026-05-31 14:03:45 +02:00
parent 505dd4b0a5
commit 101f3138ce
4 changed files with 134 additions and 5 deletions
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40
code/tests/cgal/test_mesh_io.cpp
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@@ -18,6 +18,7 @@
#include <cmath>
#include <cstdio>
#include <filesystem>
#include <fstream>
#include <stdexcept>
using namespace conformallab;
@@ -171,3 +172,42 @@ TEST(MeshIO, SaveLoadConvenienceWrappers)
rm(path);
}
// ════════════════════════════════════════════════════════════════════════════
// V3: load_mesh throws on non-finite vertex coordinate (NaN / Inf)
//
// A mesh file containing NaN or Inf vertex coordinates must be rejected at
// the I/O boundary — before the coordinates can silently poison the solver.
// ════════════════════════════════════════════════════════════════════════════
TEST(MeshIO, LoadMeshThrowsOnNaNCoordinate)
{
// Write a minimal OFF triangle with a NaN in the first vertex.
auto path = tmp_path("nan.off");
{
std::ofstream ofs(path);
ofs << "OFF\n3 1 0\n"
<< "nan 0.0 0.0\n"
<< "1.0 0.0 0.0\n"
<< "0.0 1.0 0.0\n"
<< "3 0 1 2\n";
}
EXPECT_THROW(load_mesh(path), std::runtime_error);
rm(path);
}
TEST(MeshIO, LoadMeshThrowsOnInfCoordinate)
{
// Write a minimal OFF triangle with Inf in the y-coordinate.
auto path = tmp_path("inf.off");
{
std::ofstream ofs(path);
ofs << "OFF\n3 1 0\n"
<< "0.0 0.0 0.0\n"
<< "1.0 inf 0.0\n"
<< "0.0 1.0 0.0\n"
<< "3 0 1 2\n";
}
EXPECT_THROW(load_mesh(path), std::runtime_error);
rm(path);
}