temp-override-join

Temp-Override Join

A runnable example that joins three unit cubes into a staircase using bpy.context.temp_override, following the prefer-temp-override-over-context-copy rule and the operators skill: operators that need a fabricated active/selection context run under temp_override(**kwargs), not the deprecated bpy.context.copy() dict-pass form removed in Blender 5.x.

What it witnesses: object.join under temp_override actually consumes the sources. The check asserts closed-form topology (verts = 8 × steps, faces = 6 × steps), that exactly one mesh remains, that the sources are gone, and that the local Z span covers all three steps ([-0.5, 2.5]). A no-op override (the 5.x failure mode of the old dict-pass path) leaves only step 0 and the Z span fails.

Run

# Cheap correctness check (no render) — the CI check:
blender --background --python temp_override_join.py --

# Also render a still (EEVEE on a GPU host; use --engine cycles on GPU-less hosts):
blender --background --python temp_override_join.py -- --output join.png
blender --background --python temp_override_join.py -- --output join.png --engine cycles

It exits non-zero on failure (wrong object count, topology mismatch, sources still alive, or incomplete Z span). The blender-smoke workflow runs the check on Blender 4.5 LTS and 5.1.