A runnable example that displaces a 96×96 grid (9,409 vertices) into a standing wave using
one foreach_get and one foreach_set — the bulk-IO pattern from
use-foreach-set-for-bulk-data and the
mesh-editing-and-bmesh skill — instead of
9,409 individual mesh.vertices[i].co accesses.
What it witnesses: the bulk path is not just faster, it is correct — the check asserts the flat grid gained the expected Z span (the write actually landed) and that every vertex matches the closed-form wave, so a stride or interleave bug in the flat buffer cannot hide behind a lucky probe.
Edge-to-edge field — the displaced sheet fills the frame and crops at the left,
right, and bottom edges so the wave reads as a surface, not an object on a
stage (measured fill 1.000x/0.817y with edge touch on three sides). If wired
to examples/gallery_framing.py, call it with
deviation="edge-to-edge wave field; the fill is the point".
# Cheap correctness check (no render) — the CI check:
blender --background --python wave_displace.py --
# Also render a still (EEVEE on a GPU host; use --engine cycles on GPU-less hosts):
blender --background --python wave_displace.py -- --output wave.png
blender --background --python wave_displace.py -- --output wave.png --engine cyclesIt exits non-zero on failure (span wrong, or any vertex off the closed form). The
blender-smoke workflow runs the check on Blender 4.5 LTS and 5.1.