From 0c98b240c3e0aff6624385ffab8f4cc4af3580cd Mon Sep 17 00:00:00 2001
From: AJ Isaacs <ajisaacs27@gmail.com>
Date: Fri, 13 Mar 2026 10:23:39 -0400
Subject: [PATCH] feat(engine): integrate NFP phase into Fill(groupParts)
 single-drawing path

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 OpenNest.Engine/NestEngine.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/OpenNest.Engine/NestEngine.cs b/OpenNest.Engine/NestEngine.cs
index 2d3e649..8364c70 100644
--- a/OpenNest.Engine/NestEngine.cs
+++ b/OpenNest.Engine/NestEngine.cs
@@ -320,6 +320,18 @@ namespace OpenNest
                         ReportProgress(progress, NestPhase.Pairs, PlateNumber, best, workArea);
                     }
 
+                    token.ThrowIfCancellationRequested();
+
+                    // NFP phase (non-rectangular parts only)
+                    var nfpResult = FillNfpBestFit(nestItem, workArea);
+                    Debug.WriteLine($"[Fill(groupParts,Box)] NFP: {nfpResult?.Count ?? 0} parts");
+
+                    if (IsBetterFill(nfpResult, best, workArea))
+                    {
+                        best = nfpResult;
+                        ReportProgress(progress, NestPhase.Nfp, PlateNumber, best, workArea);
+                    }
+
                     // Try improving by filling the remainder strip separately.
                     var improved = TryRemainderImprovement(nestItem, workArea, best);