fix(engine): default FillContext.Policy to avoid null-deref in ReportProgress

FillContext.ReportProgress dereferences Policy.Comparer, so any caller
that forgot to set Policy hit a NullReferenceException. Default to
FillPolicy(DefaultFillComparer) so tests and ad-hoc callers work without
boilerplate.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest.Core/CNC/Program.cs

@@ -128,6 +128,12 @@ namespace OpenNest.CNC
             {
                 var code = Codes[i];
 
+                if (code is SubProgramCall subpgm)
+                {
+                    subpgm.Offset = new Geometry.Vector(
+                        subpgm.Offset.X + x, subpgm.Offset.Y + y);
+                }
+
                 if (code is Motion == false)
                     continue;
 
@@ -150,6 +156,12 @@ namespace OpenNest.CNC
             {
                 var code = Codes[i];
 
+                if (code is SubProgramCall subpgm)
+                {
+                    subpgm.Offset = new Geometry.Vector(
+                        subpgm.Offset.X + voffset.X, subpgm.Offset.Y + voffset.Y);
+                }
+
                 if (code is Motion == false)
                     continue;
 

OpenNest.Core/IMaterialProvidingPostProcessor.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace OpenNest
+{
+    public interface IMaterialProvidingPostProcessor
+    {
+        IEnumerable<string> GetMaterialNames();
+    }
+}

OpenNest.Core/IPostProcessorNestAware.cs

@@ -0,0 +1,7 @@
+namespace OpenNest
+{
+    public interface IPostProcessorNestAware
+    {
+        void PrepareForNest(Nest nest);
+    }
+}

OpenNest.Engine/Strategies/FillContext.cs

@@ -15,7 +15,7 @@ namespace OpenNest.Engine.Strategies
         public int PlateNumber { get; init; }
         public CancellationToken Token { get; init; }
         public IProgress<NestProgress> Progress { get; init; }
-        public FillPolicy Policy { get; init; }
+        public FillPolicy Policy { get; init; } = new FillPolicy(new DefaultFillComparer());
         public int MaxQuantity { get; init; }
         public PartType PartType { get; set; }
 

OpenNest.Posts.Cincinnati/CincinnatiPartSubprogramWriter.cs

@@ -16,11 +16,16 @@ public sealed class CincinnatiPartSubprogramWriter
 {
     private readonly CincinnatiPostConfig _config;
     private readonly CincinnatiFeatureWriter _featureWriter;
+    private readonly CoordinateFormatter _fmt;
+    private readonly Dictionary<int, int> _holeSubprograms;
 
-    public CincinnatiPartSubprogramWriter(CincinnatiPostConfig config)
+    public CincinnatiPartSubprogramWriter(CincinnatiPostConfig config,
+        Dictionary<int, int> holeSubprograms = null)
     {
         _config = config;
         _featureWriter = new CincinnatiFeatureWriter(config);
+        _fmt = new CoordinateFormatter(config.PostedAccuracy);
+        _holeSubprograms = holeSubprograms;
     }
 
     /// <summary>
@@ -44,6 +49,15 @@ public sealed class CincinnatiPartSubprogramWriter
         for (var i = 0; i < ordered.Count; i++)
         {
             var (codes, isEtch) = ordered[i];
+            var isLastFeature = i == ordered.Count - 1;
+
+            // SubProgramCall features are emitted as M98 hole calls
+            if (codes.Count == 1 && codes[0] is SubProgramCall holeCall)
+            {
+                WriteHoleSubprogramCall(w, holeCall, i, isLastFeature);
+                continue;
+            }
+
             var featureNumber = i == 0
                 ? _config.FeatureLineNumberStart
                 : 1000 + i + 1;
@@ -55,7 +69,7 @@ public sealed class CincinnatiPartSubprogramWriter
                 FeatureNumber = featureNumber,
                 PartName = drawingName,
                 IsFirstFeatureOfPart = false,
-                IsLastFeatureOnSheet = i == ordered.Count - 1,
+                IsLastFeatureOnSheet = isLastFeature,
                 IsSafetyHeadraise = false,
                 IsExteriorFeature = false,
                 IsEtch = isEtch,
@@ -70,6 +84,30 @@ public sealed class CincinnatiPartSubprogramWriter
         w.WriteLine($"M99 (END OF {drawingName})");
     }
 
+    private void WriteHoleSubprogramCall(TextWriter w, SubProgramCall call,
+        int featureIndex, bool isLastFeature)
+    {
+        var postSubNum = _holeSubprograms != null && _holeSubprograms.TryGetValue(call.Id, out var num)
+            ? num : call.Id;
+
+        var featureNumber = featureIndex == 0
+            ? _config.FeatureLineNumberStart
+            : 1000 + featureIndex + 1;
+
+        var sb = new StringBuilder();
+        if (_config.UseLineNumbers)
+            sb.Append($"N{featureNumber} ");
+        sb.Append($"G52 X{_fmt.FormatCoord(call.Offset.X)} Y{_fmt.FormatCoord(call.Offset.Y)}");
+        w.WriteLine(sb.ToString());
+
+        w.WriteLine($"M98 P{postSubNum}");
+
+        w.WriteLine("G52 X0 Y0");
+
+        if (!isLastFeature)
+            w.WriteLine("M47");
+    }
+
     /// <summary>
     /// If the program has no leading rapid, inserts a synthetic rapid at the
     /// last motion endpoint (the contour return point). This ensures the feature

OpenNest.Posts.Cincinnati/CincinnatiPostConfig.cs

@@ -1,5 +1,7 @@
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Linq;
 
 namespace OpenNest.Posts.Cincinnati
 {
@@ -277,6 +279,24 @@ namespace OpenNest.Posts.Cincinnati
         [DisplayName("Etch Libraries")]
         [Description("Gas-to-library mapping for etch operations.")]
         public List<EtchLibraryEntry> EtchLibraries { get; set; } = new();
+
+        [Category("B. Libraries")]
+        [DisplayName("Selected Library")]
+        [Description("Overrides Material/Thickness/Gas auto-resolution. Pick an existing entry from Material Libraries, or leave blank to auto-resolve.")]
+        [TypeConverter(typeof(MaterialLibraryNameConverter))]
+        public string SelectedLibrary { get; set; } = "";
+
+        public string FindBestLibrary(string materialName, double thickness)
+        {
+            if (MaterialLibraries == null || string.IsNullOrEmpty(materialName))
+                return "";
+
+            return MaterialLibraries
+                .Where(e => string.Equals(e.Material, materialName, StringComparison.OrdinalIgnoreCase))
+                .OrderBy(e => System.Math.Abs(e.Thickness - thickness))
+                .Select(e => e.Library)
+                .FirstOrDefault() ?? "";
+        }
     }
 
     public class MaterialLibraryEntry

OpenNest.Posts.Cincinnati/CincinnatiPostProcessor.cs

@@ -9,7 +9,7 @@ using OpenNest.CNC;
 
 namespace OpenNest.Posts.Cincinnati
 {
-    public sealed class CincinnatiPostProcessor : IConfigurablePostProcessor
+    public sealed class CincinnatiPostProcessor : IConfigurablePostProcessor, IPostProcessorNestAware, IMaterialProvidingPostProcessor
     {
         private static readonly JsonSerializerOptions JsonOptions = new()
         {
@@ -25,6 +25,23 @@ namespace OpenNest.Posts.Cincinnati
 
         object IConfigurablePostProcessor.Config => Config;
 
+        public IEnumerable<string> GetMaterialNames()
+        {
+            if (Config?.MaterialLibraries == null)
+                return System.Array.Empty<string>();
+
+            return Config.MaterialLibraries
+                .Select(e => e.Material)
+                .Where(s => !string.IsNullOrWhiteSpace(s));
+        }
+
+        public void PrepareForNest(Nest nest)
+        {
+            var materialName = nest?.Material?.Name ?? "";
+            var thickness = nest?.Thickness ?? 0.0;
+            Config.SelectedLibrary = Config.FindBestLibrary(materialName, thickness);
+        }
+
         public CincinnatiPostProcessor()
         {
             var configPath = GetConfigPath();
@@ -128,7 +145,8 @@ namespace OpenNest.Posts.Cincinnati
             // Part sub-programs (if enabled)
             if (subprogramEntries != null)
             {
-                var partSubWriter = new CincinnatiPartSubprogramWriter(Config);
+                var partSubWriter = new CincinnatiPartSubprogramWriter(Config,
+                    holeMapping.Count > 0 ? holeMapping : null);
                 var sheetDiagonal = firstPlate != null
                     ? System.Math.Sqrt(firstPlate.Size.Width * firstPlate.Size.Width
                         + firstPlate.Size.Length * firstPlate.Size.Length)

OpenNest.Posts.Cincinnati/MaterialLibraryNameConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+
+namespace OpenNest.Posts.Cincinnati
+{
+    public sealed class MaterialLibraryNameConverter : StringConverter
+    {
+        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) => true;
+
+        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) => false;
+
+        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
+        {
+            var config = context?.Instance as CincinnatiPostConfig;
+            var names = new List<string> { "" };
+
+            if (config?.MaterialLibraries != null)
+            {
+                names.AddRange(config.MaterialLibraries
+                    .Select(e => e.Library)
+                    .Where(s => !string.IsNullOrWhiteSpace(s))
+                    .Distinct(StringComparer.OrdinalIgnoreCase)
+                    .OrderBy(s => s, StringComparer.OrdinalIgnoreCase));
+            }
+
+            return new StandardValuesCollection(names);
+        }
+    }
+}

OpenNest.Posts.Cincinnati/MaterialLibraryResolver.cs

@@ -10,15 +10,20 @@ public sealed class MaterialLibraryResolver
 
     private readonly List<MaterialLibraryEntry> _materialLibraries;
     private readonly List<EtchLibraryEntry> _etchLibraries;
+    private readonly string _selectedLibrary;
 
     public MaterialLibraryResolver(CincinnatiPostConfig config)
     {
         _materialLibraries = config.MaterialLibraries ?? new List<MaterialLibraryEntry>();
         _etchLibraries = config.EtchLibraries ?? new List<EtchLibraryEntry>();
+        _selectedLibrary = config.SelectedLibrary ?? "";
     }
 
     public string ResolveCutLibrary(string materialName, double thickness, string gas)
     {
+        if (!string.IsNullOrEmpty(_selectedLibrary))
+            return EnsureLibExtension(_selectedLibrary);
+
         var entry = _materialLibraries.FirstOrDefault(e =>
             string.Equals(e.Material, materialName, StringComparison.OrdinalIgnoreCase) &&
             System.Math.Abs(e.Thickness - thickness) <= ThicknessTolerance &&

OpenNest.Posts.Cincinnati/OpenNest.Posts.Cincinnati.csproj

@@ -6,11 +6,19 @@
   <ItemGroup>
     <ProjectReference Include="..\OpenNest.Core\OpenNest.Core.csproj" />
   </ItemGroup>
+  <ItemGroup>
+    <None Update="OpenNest.Posts.Cincinnati.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
   <Target Name="CopyToPostsDir" AfterTargets="Build">
     <PropertyGroup>
       <PostsDir>..\OpenNest\bin\$(Configuration)\$(TargetFramework)\Posts\</PostsDir>
+      <ConfigJson>$(MSBuildProjectDirectory)\OpenNest.Posts.Cincinnati.json</ConfigJson>
+      <DeployedConfigJson>$(PostsDir)OpenNest.Posts.Cincinnati.json</DeployedConfigJson>
     </PropertyGroup>
     <MakeDir Directories="$(PostsDir)" />
     <Copy SourceFiles="$(TargetPath)" DestinationFolder="$(PostsDir)" SkipUnchangedFiles="true" ContinueOnError="true" />
+    <Copy SourceFiles="$(ConfigJson)" DestinationFolder="$(PostsDir)" SkipUnchangedFiles="true" ContinueOnError="true" Condition="!Exists('$(DeployedConfigJson)')" />
   </Target>
 </Project>

OpenNest.Posts.Cincinnati/OpenNest.Posts.Cincinnati.json

@@ -0,0 +1,163 @@
+{
+  "ConfigurationName": "CL940",
+  "PostedUnits": "Inches",
+  "PostedAccuracy": 4,
+  "UseLineNumbers": true,
+  "FeatureLineNumberStart": 1,
+  "UseSheetSubprograms": true,
+  "SheetSubprogramStart": 101,
+  "UsePartSubprograms": false,
+  "PartSubprogramStart": 200,
+  "VariableDeclarationSubprogram": 100,
+  "CoordModeBetweenParts": "G92",
+  "ProcessParameterMode": "LibraryFile",
+  "DefaultAssistGas": "O2",
+  "DefaultEtchGas": "N2",
+  "UseExactStopMode": false,
+  "UseSpeedGas": false,
+  "UseAntiDive": true,
+  "UseSmartRapids": false,
+  "KerfCompensation": "ControllerSide",
+  "DefaultKerfSide": "Left",
+  "InteriorM47": "Always",
+  "ExteriorM47": "Always",
+  "M47OverrideDistanceThreshold": null,
+  "SafetyHeadraiseDistance": 2000,
+  "PalletExchange": "EndOfSheet",
+  "LeadInFeedratePercent": 0.5,
+  "LeadInArcLine2FeedratePercent": 0.5,
+  "LeadOutFeedratePercent": 0.5,
+  "CircleFeedrateMultiplier": 0.8,
+  "ArcFeedrate": "None",
+  "ArcFeedrateRanges": [
+    { "MaxRadius": 0.125, "FeedratePercent": 0.25, "VariableNumber": 123 },
+    { "MaxRadius": 0.75, "FeedratePercent": 0.5, "VariableNumber": 124 },
+    { "MaxRadius": 4.5, "FeedratePercent": 0.8, "VariableNumber": 125 }
+  ],
+  "UserVariableStart": 200,
+  "SheetWidthVariable": 110,
+  "SheetLengthVariable": 111,
+  "MaterialLibraries": [
+    { "Material": "Aluminum", "Thickness": 0.032, "Gas": "AIR", "Library": "AL032AIR" },
+    { "Material": "Aluminum", "Thickness": 0.032, "Gas": "N2", "Library": "AL032N2" },
+    { "Material": "Aluminum", "Thickness": 0.032, "Gas": "O2", "Library": "AL032O2" },
+    { "Material": "Aluminum", "Thickness": 0.050, "Gas": "AIR", "Library": "AL050AIR" },
+    { "Material": "Aluminum", "Thickness": 0.050, "Gas": "N2", "Library": "AL050N2" },
+    { "Material": "Aluminum", "Thickness": 0.050, "Gas": "O2", "Library": "AL050O2" },
+    { "Material": "Aluminum", "Thickness": 0.063, "Gas": "AIR", "Library": "AL063AIR" },
+    { "Material": "Aluminum", "Thickness": 0.063, "Gas": "N2", "Library": "AL063N2" },
+    { "Material": "Aluminum", "Thickness": 0.063, "Gas": "O2", "Library": "AL063O2" },
+    { "Material": "Aluminum", "Thickness": 0.080, "Gas": "AIR", "Library": "AL080AIR" },
+    { "Material": "Aluminum", "Thickness": 0.080, "Gas": "N2", "Library": "AL080N2" },
+    { "Material": "Aluminum", "Thickness": 0.080, "Gas": "O2", "Library": "AL080O2" },
+    { "Material": "Aluminum", "Thickness": 0.090, "Gas": "AIR", "Library": "AL090AIR" },
+    { "Material": "Aluminum", "Thickness": 0.090, "Gas": "N2", "Library": "AL090N2" },
+    { "Material": "Aluminum", "Thickness": 0.090, "Gas": "O2", "Library": "AL090O2" },
+    { "Material": "Aluminum", "Thickness": 0.100, "Gas": "AIR", "Library": "AL100AIR" },
+    { "Material": "Aluminum", "Thickness": 0.100, "Gas": "N2", "Library": "AL100N2" },
+    { "Material": "Aluminum", "Thickness": 0.100, "Gas": "O2", "Library": "AL100O2" },
+    { "Material": "Aluminum", "Thickness": 0.125, "Gas": "AIR", "Library": "AL125AIR" },
+    { "Material": "Aluminum", "Thickness": 0.125, "Gas": "N2", "Library": "AL125N2" },
+    { "Material": "Aluminum", "Thickness": 0.125, "Gas": "O2", "Library": "AL125O2" },
+    { "Material": "Aluminum", "Thickness": 0.190, "Gas": "AIR", "Library": "AL190AIR" },
+    { "Material": "Aluminum", "Thickness": 0.190, "Gas": "N2", "Library": "AL190N2" },
+    { "Material": "Aluminum", "Thickness": 0.190, "Gas": "O2", "Library": "AL190O2" },
+    { "Material": "Aluminum", "Thickness": 0.250, "Gas": "AIR", "Library": "AL250AIR" },
+    { "Material": "Aluminum", "Thickness": 0.250, "Gas": "N2", "Library": "AL250N2" },
+    { "Material": "Aluminum", "Thickness": 0.250, "Gas": "O2", "Library": "AL250O2" },
+    { "Material": "Aluminum", "Thickness": 0.375, "Gas": "AIR", "Library": "AL375AIR" },
+    { "Material": "Aluminum", "Thickness": 0.375, "Gas": "N2", "Library": "AL375N2" },
+    { "Material": "Aluminum", "Thickness": 0.375, "Gas": "O2", "Library": "AL375O2" },
+    { "Material": "Aluminum", "Thickness": 0.500, "Gas": "AIR", "Library": "AL500AIR" },
+    { "Material": "Aluminum", "Thickness": 0.500, "Gas": "N2", "Library": "AL500N2" },
+    { "Material": "Aluminum", "Thickness": 0.500, "Gas": "O2", "Library": "AL500O2" },
+    { "Material": "Aluminum", "Thickness": 0.625, "Gas": "N2", "Library": "AL625N2" },
+    { "Material": "Aluminum", "Thickness": 0.750, "Gas": "AIR", "Library": "AL750AIR" },
+    { "Material": "Aluminum", "Thickness": 0.750, "Gas": "N2", "Library": "AL750N2" },
+    { "Material": "Aluminum", "Thickness": 0.750, "Gas": "O2", "Library": "AL750O2" },
+    { "Material": "Aluminum", "Thickness": 1.000, "Gas": "AIR", "Library": "AL1000AIR" },
+    { "Material": "Aluminum", "Thickness": 1.000, "Gas": "N2", "Library": "AL1000N2" },
+
+    { "Material": "Galvanized Steel", "Thickness": 0.135, "Gas": "N2", "Library": "GALV135N2" },
+    { "Material": "Galvanized Steel", "Thickness": 0.188, "Gas": "N2", "Library": "GALV188N2" },
+
+    { "Material": "Carbon Steel", "Thickness": 0.036, "Gas": "AIR", "Library": "MS036AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.036, "Gas": "N2", "Library": "MS036N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.048, "Gas": "AIR", "Library": "MS048AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.048, "Gas": "N2", "Library": "MS048N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.060, "Gas": "AIR", "Library": "MS060AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.060, "Gas": "N2", "Library": "MS060N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.075, "Gas": "AIR", "Library": "MS075AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.075, "Gas": "N2", "Library": "MS075N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.075, "Gas": "N2", "Library": "MS075N2FE" },
+    { "Material": "Carbon Steel", "Thickness": 0.090, "Gas": "N2", "Library": "MS090N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.105, "Gas": "AIR", "Library": "MS105AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.105, "Gas": "N2", "Library": "MS105N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.120, "Gas": "AIR", "Library": "MS120AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.120, "Gas": "N2", "Library": "MS120N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.120, "Gas": "N2", "Library": "MS120N2FE" },
+    { "Material": "Carbon Steel", "Thickness": 0.135, "Gas": "AIR", "Library": "MS135AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.135, "Gas": "N2", "Library": "MS135N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.135, "Gas": "N2", "Library": "MS135N2FE" },
+    { "Material": "Carbon Steel", "Thickness": 0.135, "Gas": "N2", "Library": "MS135N2Panel" },
+    { "Material": "Carbon Steel", "Thickness": 0.188, "Gas": "AIR", "Library": "MS188AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.188, "Gas": "N2", "Library": "MS188N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.188, "Gas": "N2", "Library": "MS188N2FLOORPLATE" },
+    { "Material": "Carbon Steel", "Thickness": 0.188, "Gas": "O2", "Library": "MS188O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.250, "Gas": "AIR", "Library": "MS250AIR" },
+    { "Material": "Carbon Steel", "Thickness": 0.250, "Gas": "N2", "Library": "MS250N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.250, "Gas": "N2", "Library": "MS250N2FLOORPLATE" },
+    { "Material": "Carbon Steel", "Thickness": 0.250, "Gas": "O2", "Library": "MS250O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.313, "Gas": "O2", "Library": "MS313O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.375, "Gas": "O2", "Library": "MS375O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.500, "Gas": "N2", "Library": "MS500N2" },
+    { "Material": "Carbon Steel", "Thickness": 0.500, "Gas": "O2", "Library": "MS500O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.625, "Gas": "O2", "Library": "MS625O2" },
+    { "Material": "Carbon Steel", "Thickness": 0.750, "Gas": "O2", "Library": "MS750O2" },
+    { "Material": "Carbon Steel", "Thickness": 1.000, "Gas": "O2", "Library": "MS1000O2" },
+
+    { "Material": "Stainless Steel", "Thickness": 0.036, "Gas": "AIR", "Library": "SS036AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.036, "Gas": "N2", "Library": "SS036N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.048, "Gas": "AIR", "Library": "SS048AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.048, "Gas": "N2", "Library": "SS048N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.060, "Gas": "AIR", "Library": "SS060AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.060, "Gas": "N2", "Library": "SS060N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.075, "Gas": "AIR", "Library": "SS075AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.075, "Gas": "N2", "Library": "SS075N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.075, "Gas": "N2", "Library": "SS075N2FE" },
+    { "Material": "Stainless Steel", "Thickness": 0.105, "Gas": "AIR", "Library": "SS105AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.105, "Gas": "N2", "Library": "SS105N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.105, "Gas": "N2", "Library": "SS105N2FE" },
+    { "Material": "Stainless Steel", "Thickness": 0.120, "Gas": "AIR", "Library": "SS120AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.120, "Gas": "N2", "Library": "SS120N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.120, "Gas": "N2", "Library": "SS120N2FE" },
+    { "Material": "Stainless Steel", "Thickness": 0.135, "Gas": "AIR", "Library": "SS135AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.135, "Gas": "N2", "Library": "SS135N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.135, "Gas": "N2", "Library": "SS135N2FE" },
+    { "Material": "Stainless Steel", "Thickness": 0.188, "Gas": "AIR", "Library": "SS188AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.188, "Gas": "N2", "Library": "SS188N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.250, "Gas": "AIR", "Library": "SS250AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.250, "Gas": "N2", "Library": "SS250N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.313, "Gas": "N2", "Library": "SS313N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.375, "Gas": "AIR", "Library": "SS375AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.375, "Gas": "N2", "Library": "SS375N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.500, "Gas": "AIR", "Library": "SS500AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.500, "Gas": "N2", "Library": "SS500N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.625, "Gas": "N2", "Library": "SS625N2" },
+    { "Material": "Stainless Steel", "Thickness": 0.750, "Gas": "AIR", "Library": "SS750AIR" },
+    { "Material": "Stainless Steel", "Thickness": 0.750, "Gas": "N2", "Library": "SS750N2" },
+    { "Material": "Stainless Steel", "Thickness": 1.000, "Gas": "AIR", "Library": "SS1000AIR" },
+    { "Material": "Stainless Steel", "Thickness": 1.000, "Gas": "N2", "Library": "SS1000N2" },
+
+    { "Material": "Phenolic", "Thickness": 0.0, "Gas": "", "Library": "Phenolic" },
+    { "Material": "Gasket", "Thickness": 0.250, "Gas": "N2", "Library": "GASKET250N2" }
+  ],
+  "EtchLibraries": [
+    { "Gas": "AIR", "Library": "EtchAIR" },
+    { "Gas": "N2", "Library": "EtchN2" },
+    { "Gas": "N2", "Library": "EtchN2_fast" },
+    { "Gas": "N2", "Library": "Etchn2_no_mark_pvc" },
+    { "Gas": "O2", "Library": "EtchO2" },
+    { "Gas": "O2", "Library": "ETCHO2FINE" }
+  ]
+}

OpenNest/Forms/EditNestForm.Designer.cs

@@ -81,8 +81,8 @@
             // 
             // tabControl1
             // 
-            tabControl1.Controls.Add(tabPage1);
             tabControl1.Controls.Add(tabPage2);
+            tabControl1.Controls.Add(tabPage1);
             tabControl1.Dock = System.Windows.Forms.DockStyle.Fill;
             tabControl1.ItemSize = new System.Drawing.Size(100, 22);
             tabControl1.Location = new System.Drawing.Point(0, 0);

OpenNest/Forms/EditNestInfoForm.Designer.cs

@@ -63,7 +63,7 @@
             this.textBox2 = new System.Windows.Forms.TextBox();
             this.label5 = new System.Windows.Forms.Label();
             this.labelMaterial = new System.Windows.Forms.Label();
-            this.materialBox = new System.Windows.Forms.TextBox();
+            this.materialBox = new System.Windows.Forms.ComboBox();
             this.tabPage2 = new System.Windows.Forms.TabPage();
             this.tabPage3 = new System.Windows.Forms.TabPage();
             this.notesBox = new System.Windows.Forms.TextBox();
@@ -516,9 +516,10 @@
             // materialBox
             //
             this.materialBox.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
+            this.materialBox.FormattingEnabled = true;
             this.materialBox.Location = new System.Drawing.Point(135, 159);
             this.materialBox.Name = "materialBox";
-            this.materialBox.Size = new System.Drawing.Size(224, 22);
+            this.materialBox.Size = new System.Drawing.Size(224, 24);
             this.materialBox.TabIndex = 11;
             //
             // label3
@@ -729,6 +730,6 @@
         private System.Windows.Forms.RadioButton radioButton2;
         private System.Windows.Forms.Label label5;
         private System.Windows.Forms.Label labelMaterial;
-        private System.Windows.Forms.TextBox materialBox;
+        private System.Windows.Forms.ComboBox materialBox;
     }
 }

OpenNest/Forms/EditNestInfoForm.cs

@@ -15,6 +15,9 @@ namespace OpenNest.Forms
         {
             InitializeComponent();
 
+            foreach (var name in PostProcessorMaterials.Names)
+                materialBox.Items.Add(name);
+
             timer = new Timer
             {
                 SynchronizingObject = this,

OpenNest/Forms/MainForm.cs

@@ -351,6 +351,9 @@ namespace OpenNest.Forms
                         postProcessorMenuItem.Tag = postProcessor;
                         postProcessorMenuItem.Click += PostProcessor_Click;
                         mnuNestPost.DropDownItems.Add(postProcessorMenuItem);
+
+                        if (postProcessor is IMaterialProvidingPostProcessor materialProvider)
+                            PostProcessorMaterials.AddFrom(materialProvider);
                     }
                 }
             }
@@ -1157,6 +1160,9 @@ namespace OpenNest.Forms
             if (postProcessor == null)
                 return;
 
+            if (postProcessor is IPostProcessorNestAware nestAware)
+                nestAware.PrepareForNest(activeForm.Nest);
+
             if (postProcessor is IConfigurablePostProcessor configurable)
             {
                 using var configForm = new PostProcessorConfigForm(configurable);

OpenNest/PostProcessorMaterials.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace OpenNest
+{
+    public static class PostProcessorMaterials
+    {
+        private static readonly List<string> materials = new();
+
+        public static IReadOnlyList<string> Names => materials;
+
+        public static void AddFrom(IMaterialProvidingPostProcessor provider)
+        {
+            if (provider == null)
+                return;
+
+            foreach (var name in provider.GetMaterialNames())
+            {
+                if (!string.IsNullOrWhiteSpace(name)
+                    && !materials.Contains(name, StringComparer.OrdinalIgnoreCase))
+                {
+                    materials.Add(name);
+                }
+            }
+
+            materials.Sort(StringComparer.OrdinalIgnoreCase);
+        }
+    }
+}