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ajandClaude Opus 5.5
6867ae2ee4
On a plate packed edge to edge, an overlap left by hand-placing extra parts could not be fixed: straight push chains ran into the edge and the relaxation gave up on pairs that share material, which have no contact normal. The relaxation now pushes such a pair along its shortest straight way out and lets the rest settle, which cleared a 0.92 sq in overlap on a 38-part plate with every part kept square. When moves alone still cannot settle, the relaxation runs again as a rigid one: an off-center push also turns a part, up to 3 degrees, if its drawing is free to rotate. Moves stay first because a tilt turns every part the push reaches. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
56 lines
3.6 KiB
Markdown
56 lines
3.6 KiB
Markdown
# Fix Spacing
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`Plate > Fix Spacing` clears the pairs the overlap check flags (parts sharing material, and
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parts closer than the plate's `PartSpacing`, or than their kerf for common-line partners) with
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the smallest moves it can find. It moves parts by translation, tilts them slightly only as a
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last resort (below), and never changes `PartSpacing` or `EdgeSpacing`. Unlike [Expand Spacing](expand-spacing.md) it needs no
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selection and does not open up the rest of the layout: parts nothing crowds stay where they
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are. With parts selected, only flagged pairs that include a selected part are fixed. The
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engine entry point is `SpacingFixer.Fix`.
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## How a pair is opened
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Pairs are fixed in turn, overlaps first, then the tightest gaps. Gaps are measured on the
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same native contours the overlap check confirms with (`NativeContours`), flattened a little
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coarser for speed; that understates gaps, so a push errs slightly long.
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1. **Straight chains.** One part of the pair is pushed straight away from the other, in each
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of 16 directions, by just enough to reach the spacing plus the check's slack. Any part that
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push brings closer than its floor is pushed the same way by its own shortfall, and so on
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down the chain, so a fix can ripple through rows already locked in at the spacing. A chain
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fails when it would push the pair's other part, a common-line member, or a part past the
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work-area edge or into a clamp. The chain with the least total travel wins.
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2. **Relaxation.** When no straight chain has room (a plate packed edge to edge), each crowded
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pair is pushed apart along the normal between its closest points, the shortfall shared
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between its two parts; a part held by the work-area edge or locked passes its share to the
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other. Passes repeat until every gap holds, so the moves can differ in direction (one part
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right and up, its partner down and left). Parts that share material have no contact normal;
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they are pushed along their shortest straight way out (16 directions) instead. A move under
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0.0001 that the layout does not need is undone.
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3. **Tilt.** When moves alone cannot settle, the relaxation runs again as a rigid one: a push
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at a contact off a part's center also turns it about that center, by up to
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`SpacingFixer.DefaultMaxTilt` (3 degrees) from where it started. Only parts whose drawing is
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free to rotate tilt (no rotation constraints, or a full turn allowed); the rest only move.
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A tilted part's lead-ins turn with it. The status bar names how many parts tilted and by
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how much. Moves are always tried first: tilting turns every part the push reaches.
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A pair's **floor** is its required gap, or its gap before the fix when that is already
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smaller (another flagged pair never gets worse), less 0.00001 of rounding allowance.
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## Validation
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The plan for every pair is checked once with the overlap check. The result is applied only
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when it has fewer findings than before and nothing new: no new pair, edge, clamp or
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unreadable finding. Otherwise the pairs are redone one at a time, each fix kept only when the
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overlap check rates the plate better. A pair with no room is left as it was and counted in the
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status bar ("Fixed 3 of 4 flagged pairs ... - 1 flagged pair left").
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Cut-offs are not obstacles: they are regenerated around the moved parts. Irregular sheet
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outlines are honored through the final overlap check, which reports parts outside them.
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## Desktop
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The command runs on a worker behind the same Cancel window as Expand Spacing, and refuses
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while Auto Nest or a fill is still running on the nest. A canceled run moves nothing. It records
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one undo step, "Fix Spacing", and does not save.
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