aj
df283d15dc
The engine gets 7 parts where manual nesting gets 9, all at the same rotation. The fix is trying more rotations across all fill strategies. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
# Remnant Fill Optimization — Try More Rotations
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## Problem
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`NestEngine.Fill(NestItem, Box)` gets 7 parts in a narrow remnant strip where manual nesting gets 9 — all at the same rotation. The engine simply isn't trying the rotation angle that fits best.
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## Test Case
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Load `C:/Users/AJ/Desktop/N0308-008.zip` — 75 parts on a 36x36 plate. Remnant strip is at `(31.0, 0.8) 4.7x35.0`.
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```
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load_nest("C:/Users/AJ/Desktop/N0308-008.zip")
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fill_remnants(0, "Converto 3 YRD DUMPERSTER HINGE PLATE #2") → gets 7, should get 9
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```
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## Root Cause
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In `NestEngine.Fill(NestItem, Box)` (`OpenNest.Engine/NestEngine.cs:32-105`), the rotation candidates are:
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1. `bestRotation` from `RotationAnalysis.FindBestRotation(item)`
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2. `bestRotation + 90°`
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3. If the strip is narrow relative to the part, a sweep every 5° from 0° to 175°
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The narrow-strip sweep triggers when `workAreaShortSide < partLongestSide`. For this strip (4.7" wide, part is 5.89x3.39), the short side is 4.7 and the part's longest side is 5.89, so the sweep **should** trigger. But the winning rotation may still not be found because:
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- The sweep only runs on the `bestRotation`-normalized part dimensions
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- `FillLinear` may not be optimal for all angles — check if `FillRectangleBestFit` and `FillWithPairs` are also tried at each sweep angle
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## Fix
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Ensure all three fill strategies (FillLinear, FillRectangleBestFit, FillWithPairs) are tried across the full set of rotation candidates, not just FillLinear.
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## Files
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- `OpenNest.Engine/NestEngine.cs:32-105` — `Fill(NestItem, Box)` rotation logic
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- `OpenNest.Engine/BestFit/RotationAnalysis.cs` — `FindBestRotation`
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- `OpenNest.Engine/FillLinear.cs` — linear tiling
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