Coincident (or sub-ULP-separated) bodies made octree_insert subdivide
forever in the graph-UI 3D layout, calloc-ing one cell per level until
the process crashed (stack overflow) or froze the machine allocating
(the 34GB-swap reports). Guard distilled from #821: octree_insert now
carries a depth and stops at depth 26 or half_size < 1e-4f, folding the
body into the cell as a mass-weighted centroid aggregate
(body_index = -1). octree_repulse already clamps d to 0.01 before the
dx/d division, so folded coincident bodies get exactly zero force and
no NaN.
The default-cap raise bundled in #821 (DEFAULT_MAX_NODES and
GRAPH_RENDER_NODE_LIMIT 2000 -> 60000) is a UX policy change deferred
to its own discussion per review; HARD_MAX_NODES is raised to 200000 so
opt-in CBM_UI_MAX_RENDER_NODES users get the new ceiling.
Guard test layout_coincident_nodes_bounded drives the public layout API
with same-file nodes whose distinct qualified names share one 32-bit
FNV-1a hash (bit-identical coincident positions on every platform), in
a fork+alarm child so the unfixed runaway cannot take down the runner.
Refs #498, #726, #402
Co-authored-by: Ljove02 <135197334+Ljove02@users.noreply.github.com>
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
Two UI config tests (config_corrupt_file, config_missing_fields) used
Unix-only system("mkdir -p") to create test directories. On Windows this
fails with "The syntax of the command is incorrect." — replaced with the
portable cbm_mkdir_p() function already in compat_fs.h.
The /tmp/ → %TEMP%\ translation produces longer paths (~50 chars)
than the original templates (~25 chars). Changed all 68 test
declarations from char tmpdir[] = "..." (sized to literal) to
char tmpdir[256] with snprintf initialization.
- cbm_mkdtemp: _mktemp + _mkdir on Windows
- cbm_setenv/cbm_unsetenv: _putenv_s on Windows
- cbm_pipe: _pipe on Windows
- Replace bare POSIX calls in 12 test files with compat wrappers
- All test files now include compat.h
