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perf: optimize best fit computation and plate optimizer

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- Try all valid best fit pairs instead of only the first when qty=2,
  picking the best via IsBetterFill comparer (fixes suboptimal plate
  selection during auto-nesting)
- Pre-compute best fits across all plate sizes once via
  BestFitCache.ComputeForSizes instead of per-size GPU evaluation
- Early exit plate optimizer when all items fit (salvage < 100%)
- Trim slide offset sweep range to 50% overlap to reduce candidates
- Use actual geometry (ray-arc/ray-circle intersection) instead of
  tessellated polygons for slide distance computation — eliminates
  the massive line count from circle/arc tessellation
- Add RayArcDistance and RayCircleDistance to SpatialQuery
- Add PartGeometry.GetOffsetPerimeterEntities for non-tessellated
  perimeter extraction
- Disable GPU slide computer (slower than CPU currently)
- Remove dead SelectBestFitPair virtual method and overrides

Reduces best fit computation from 7+ minutes to ~4 seconds for a
73x25" part with 30+ holes on a 48x96 plate.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-04-06 10:21:44 -04:00
parent 3bdbf21881
commit e93523d7a2
13 changed files with 410 additions and 100 deletions
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17
OpenNest.Engine/BestFit/RotationSlideStrategy.cs
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@@ -36,8 +36,8 @@ namespace OpenNest.Engine.BestFit
var part2Template = Part.CreateAtOrigin(drawing, Part2Rotation);
var halfSpacing = spacing / 2;
var part1Lines = PartGeometry.GetOffsetPartLines(part1, halfSpacing);
var part2TemplateLines = PartGeometry.GetOffsetPartLines(part2Template, halfSpacing);
var part1Entities = PartGeometry.GetOffsetPerimeterEntities(part1, halfSpacing);
var part2Entities = PartGeometry.GetOffsetPerimeterEntities(part2Template, halfSpacing);
var bbox1 = part1.BoundingBox;
var bbox2 = part2Template.BoundingBox;
@@ -48,7 +48,7 @@ namespace OpenNest.Engine.BestFit
return candidates;
var distances = _distanceComputer.ComputeDistances(
part1Lines, part2TemplateLines, offsets);
part1Entities, part2Entities, offsets);
var testNumber = 0;
@@ -90,15 +90,18 @@ namespace OpenNest.Engine.BestFit
if (isHorizontalPush)
{
// Perpendicular sweep along Y → Width; push extent along X → Length
perpMin = -(bbox2.Width + spacing);
perpMax = bbox1.Width + bbox2.Width + spacing;
// Trim to offsets where the parts overlap by at least 50%.
var halfOverlap = bbox2.Width * 0.5;
perpMin = -(halfOverlap - spacing);
perpMax = bbox1.Width + halfOverlap + spacing;
pushStartOffset = bbox1.Length + bbox2.Length + spacing * 2;
}
else
{
// Perpendicular sweep along X → Length; push extent along Y → Width
perpMin = -(bbox2.Length + spacing);
perpMax = bbox1.Length + bbox2.Length + spacing;
var halfOverlap = bbox2.Length * 0.5;
perpMin = -(halfOverlap - spacing);
perpMax = bbox1.Length + halfOverlap + spacing;
pushStartOffset = bbox1.Width + bbox2.Width + spacing * 2;
}