Per-job temp-file convention

Incident class

Parallel Blender/Python jobs writing the same fixed path (e.g. /tmp/openclinxr_skin_albedo_mixed.png) corrupt outputs. Fix is unique paths per job and per mesh.

Convention

export OPENCLINXR_JOB_TMP="${OPENCLINXR_JOB_TMP:-${TMPDIR:-/tmp}/openclinxr-job-${USER:-u}-$$-${OPENCLINXR_JOB_ID:-$(date +%s%N)}}"
mkdir -p "$OPENCLINXR_JOB_TMP"

# Prefer:
#   $OPENCLINXR_JOB_TMP/<meshId>_<stage>_$$.png
#   mktemp "$OPENCLINXR_JOB_TMP/${MESH_ID}_albedo.XXXXXX.png"

mesh_tmp() {
  local mesh="${1:?mesh id}" stage="${2:?stage}" ext="${3:-png}"
  mktemp "${OPENCLINXR_JOB_TMP}/${mesh}_${stage}_$$.XXXXXX.${ext}"
}

Code / scripts

• Accept OPENCLINXR_JOB_TMP or --job-tmp / --tmp-dir overrides.
• Default temp root = job dir, not bare /tmp.
• Include mesh id + pid + random suffix in every intermediate artifact name.
• Clean up only own job tmp on exit (trap on $OPENCLINXR_JOB_TMP when you created it).

Forbidden

• Hardcoded /tmp/openclinxr_*.png / .exr / .blend shared across workers
• Two meshes writing the same intermediate basename
• Relying on process scheduling order for exclusive /tmp use