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Clifford GarwoodandClaude Opus 4.8
90e8ff7cee
Follow-up to the cross-gantry mirror axis change, from an adversarial review of it.
GCodeViewer builds its own copy of the zone grid to place the sequential-preview
carriage markers, and it must reproduce PartPlate::calc_imex_zones exactly or the
markers drift away from the ghosts they are meant to track. It did not, in two ways,
because sizing the grid and placing a cell answer different questions:
- Sizing: calc_imex_zones counts every Copy/Mirror tool's OWN column, including the
non-representatives of an aggregated (Span) gantry -- they still donate a column.
GCodeViewer only ever saw the representative, so on an aggregated gantry it could
count fewer columns than the plate and lay its markers out against wider strips.
- Placement: calc_imex_zones PINS an aggregated cell to the primary's column, because
that row-strip spans the full bed and has no column of its own. GCodeViewer used the
representative's own column, which put the marker a strip away from the ghost
whenever the representative was not column-paired with the primary.
Track the two sets separately: grid_tool_ids sizes the grid from own columns, eff_col_of
pins only aggregated tools when placing. Out-of-grid tool indices are deliberately left
unfiltered -- calc_imex_zones drops them while calc_imex_ghosts keeps them, so no policy
here can agree with both, and a comment says so rather than pretending otherwise.
Also:
- The mirror-axis rule lived in three copies (two PartPlate lambdas plus an inline
re-derivation here). Hoist it to imex_mirror_axis_for() so the ghosts and the markers
cannot drift apart, and unit-test it, including degenerate tools_per_gantry.
- Drop imex_head_transform's mirror_axis default. A defaulted axis silently hands a
forgetful caller the X reflection, which is wrong for every cross-gantry tool and
fails silently -- exactly how a stale test kept certifying the old rule.
- Replace that stale test: it asserted a diagonal mirror "flips X only", the rule this
work overturned, and stayed green only because of the default.
- A secondary sharing the primary's gantry now takes the primary's Y box facing. The
box shows the side a tool could be hit from, and two tools on one beam can only be
hit by the same other gantry. No-op on the rear-* layouts, where the hardcoded value
already matched; on front-* layouts it pointed the box away from the only tools that
could reach it.
- Correct two comments that described the aggregated X-frame substitution as a
reflection plane. It is not one: it exists to zero gantry_offset.x, and removing it
would push aggregated ghosts a column off their strip.
Verified: 385/385 tests; CLI slice of the IMEX regression project is byte-identical to
the previous commit's G-code apart from the timestamp, confirming this is
visualization-only and cannot affect sliced output.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>