Use glTFLib as a backend

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "glTFLib"]
+	path = glTFLib
+	url = https://github.com/mcneel/glTFLib.git

glTF-BinExporter.sln

@@ -2,28 +2,130 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.30611.23
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "glTF-BinExporter", "glTF-BinExporter\glTF-BinExporter.csproj", "{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "glTF-BinExporter", "glTF-BinExporter\glTF-BinExporter.csproj", "{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}"
 EndProject
-Project("{9344BDBB-3E7F-41FC-A0DD-8665D75EE146}") = "glTF-BinExporterWin", "glTF-BinExporter\glTF-BinExporterWin.csproj", "{7F49BC9A-169E-4C15-95FA-099B5A7EC715}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "glTF-BinExporterWin", "glTF-BinExporter\glTF-BinExporterWin.csproj", "{7F49BC9A-169E-4C15-95FA-099B5A7EC715}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "glTFLib", "glTFLib", "{276539E0-5857-46E7-9A2B-D8F7C8F5D112}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Generator", "glTFLib\glTF-CSharp-Loader\Generator\Generator.csproj", "{5F1EB9C4-C06D-438C-8F71-B455DDF85456}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GeneratorLib", "glTFLib\glTF-CSharp-Loader\GeneratorLib\GeneratorLib.csproj", "{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GeneratorUnitTests", "glTFLib\glTF-CSharp-Loader\GeneratorUnitTests\GeneratorUnitTests.csproj", "{431A50BA-F27A-4685-9061-FFA171106F32}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "glTFLoader", "glTFLib\glTF-CSharp-Loader\glTFLoader\glTFLoader.csproj", "{4C88FA85-98F7-4E37-978C-1885D175B428}"
+	ProjectSection(ProjectDependencies) = postProject
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456} = {5F1EB9C4-C06D-438C-8F71-B455DDF85456}
+	EndProjectSection
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "glTFLoaderUnitTests", "glTFLib\glTF-CSharp-Loader\glTFLoaderUnitTests\glTFLoaderUnitTests.csproj", "{41F1BEA4-2895-4982-9AB7-A863C61C2075}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
 		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|x64.Build.0 = Debug|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Debug|x86.Build.0 = Debug|Any CPU
 		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|x64.ActiveCfg = Release|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|x64.Build.0 = Release|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|x86.ActiveCfg = Release|Any CPU
+		{4491BB4A-48C4-4681-9F9E-FEAA285F20CC}.Release|x86.Build.0 = Release|Any CPU
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 		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Debug|x64.Build.0 = Debug|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Debug|x86.Build.0 = Debug|Any CPU
 		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|x64.ActiveCfg = Release|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|x64.Build.0 = Release|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|x86.ActiveCfg = Release|Any CPU
+		{7F49BC9A-169E-4C15-95FA-099B5A7EC715}.Release|x86.Build.0 = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|x64.Build.0 = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Debug|x86.Build.0 = Debug|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|x64.ActiveCfg = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|x64.Build.0 = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|x86.ActiveCfg = Release|Any CPU
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456}.Release|x86.Build.0 = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|x64.Build.0 = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Debug|x86.Build.0 = Debug|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|x64.ActiveCfg = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|x64.Build.0 = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|x86.ActiveCfg = Release|Any CPU
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622}.Release|x86.Build.0 = Release|Any CPU
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|x64.ActiveCfg = Debug|x64
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|x64.Build.0 = Debug|x64
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|x86.ActiveCfg = Debug|x86
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Debug|x86.Build.0 = Debug|x86
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|Any CPU.Build.0 = Release|Any CPU
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|x64.ActiveCfg = Release|x64
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|x64.Build.0 = Release|x64
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|x86.ActiveCfg = Release|x86
+		{431A50BA-F27A-4685-9061-FFA171106F32}.Release|x86.Build.0 = Release|x86
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|x64.Build.0 = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Debug|x86.Build.0 = Debug|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|x64.ActiveCfg = Release|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|x64.Build.0 = Release|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|x86.ActiveCfg = Release|Any CPU
+		{4C88FA85-98F7-4E37-978C-1885D175B428}.Release|x86.Build.0 = Release|Any CPU
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|x64.ActiveCfg = Debug|x64
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|x64.Build.0 = Debug|x64
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|x86.ActiveCfg = Debug|x86
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Debug|x86.Build.0 = Debug|x86
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|Any CPU.Build.0 = Release|Any CPU
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|x64.ActiveCfg = Release|x64
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|x64.Build.0 = Release|x64
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|x86.ActiveCfg = Release|x86
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075}.Release|x86.Build.0 = Release|x86
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{5F1EB9C4-C06D-438C-8F71-B455DDF85456} = {276539E0-5857-46E7-9A2B-D8F7C8F5D112}
+		{DF4D02CB-5035-4A9F-AB22-62FB38AA1622} = {276539E0-5857-46E7-9A2B-D8F7C8F5D112}
+		{431A50BA-F27A-4685-9061-FFA171106F32} = {276539E0-5857-46E7-9A2B-D8F7C8F5D112}
+		{4C88FA85-98F7-4E37-978C-1885D175B428} = {276539E0-5857-46E7-9A2B-D8F7C8F5D112}
+		{41F1BEA4-2895-4982-9AB7-A863C61C2075} = {276539E0-5857-46E7-9A2B-D8F7C8F5D112}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {CC6F7860-F467-4BA2-9079-EFDC3EB9F98A}
 	EndGlobalSection

glTF-BinExporter/Utils/ColorUtils.cs → glTF-BinExporter/ColorUtils.cs

@@ -1,7 +1,7 @@
-using System.Drawing;
+using System.Drawing;
 using Rhino.Display;
 
-namespace glTF_BinExporter.glTF
+namespace glTF_BinExporter
 {
     public static class ColorUtils
     {

glTF-BinExporter/Constants.cs

@@ -0,0 +1,56 @@
+using Rhino.DocObjects;
+
+namespace glTF_BinExporter
+{
+    public static class Constants
+    {
+        public static ObjectType[] ValidObjectTypes = new ObjectType[] {
+            ObjectType.Brep,
+            ObjectType.InstanceReference,
+            ObjectType.Mesh,
+            ObjectType.Extrusion,
+            ObjectType.Surface,
+            ObjectType.SubD
+        };
+
+        public static byte[][] Paddings = new byte[][]
+        {
+            new byte[] { },
+            new byte[] { 0, 0, 0 },
+            new byte[] { 0, 0 },
+            new byte[] { 0 },
+        };
+
+        public const string TextBufferHeader = "data:application/octet-stream;base64,";
+        public const string PositionAttributeTag = "POSITION";
+        public const string NormalAttributeTag = "NORMAL";
+        public const string TexCoord0AttributeTag = "TEXCOORD_0";
+
+        public const string DracoMeshCompressionExtensionTag = "KHR_draco_mesh_compression";
+    }
+
+    public class DracoGeometryInfo
+    {
+        public bool success;
+
+        public int bufferIndex;
+        public int byteOffset;
+        public int byteLength;
+
+        public int verticesNum;
+        public float[] verticesMin;
+        public float[] verticesMax;
+
+        public int trianglesNum;
+        public float trianglesMin;
+        public float trianglesMax;
+
+        public int normalsNum;
+        public float[] normalsMin;
+        public float[] normalsMax;
+
+        public int texCoordsNum;
+        public float[] texCoordsMin;
+        public float[] texCoordsMax;
+    }
+}

glTF-BinExporter/GlTFExporterCommand.cs

@@ -7,7 +7,7 @@
 using System.Linq;
 using System.Collections.Generic;
 
-namespace glTF_BinExporter.glTF
+namespace glTF_BinExporter
 {
 
     [System.Runtime.InteropServices.Guid("82936404-bd41-46f4-8fe7-e594c2a7e8af")]
@@ -90,25 +90,17 @@ public static bool DoExport(string fileName, glTFExportOptions opts, IEnumerable
         {
             try
             {
-                // Writes the result to a memory stream, then dumps it to a file.
-                using (FileStream fileStream = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite))
-                using (MemoryStream memoryStream = new MemoryStream(1024))
-                {
-
-                    if (opts.UseBinary)
-                    {
-                        GlTFUtils.ExportBinary(memoryStream, rhinoObjects, opts);
-                    }
-                    else
-                    {
-                        GlTFUtils.ExportText(memoryStream, rhinoObjects, opts);
-                    }
-
-                    memoryStream.Flush();
-                    memoryStream.Seek(0, SeekOrigin.Begin);
-                    memoryStream.CopyTo(fileStream);
-                    fileStream.Flush();
-                    fileStream.Close();
+                RhinoDocGltfConverter converter = new RhinoDocGltfConverter(opts, rhinoObjects);
+                glTFLoader.Schema.Gltf gltf = converter.ConvertToGltf();
+
+                if(opts.UseBinary)
+                {
+                    byte[] bytes = converter.GetBinaryBuffer();
+                    glTFLoader.Interface.SaveBinaryModel(gltf, bytes, fileName);
+                }
+                else
+                {
+                    glTFLoader.Interface.SaveModel(gltf, fileName);
                 }
 
                 RhinoApp.WriteLine("Successfully exported selected geometry to glTF(Binary).");

glTF-BinExporter/glTF/GlTFUtils.cs → glTF-BinExporter/GlTFUtils.cs

@@ -8,7 +8,7 @@
 using Rhino.Geometry;
 using Rhino.Render;
 
-namespace glTF_BinExporter.glTF
+namespace glTF_BinExporter
 {
     /// <summary>
     /// Functions for helping with adding RhinoObjects to the RootModel.
@@ -62,8 +62,10 @@ public static Rhino.Geometry.Mesh[] GetMeshes(RhinoObject rhinoObject) {
         /// </summary>
         /// <param name="rhinoObjects"></param>
         /// <returns></returns>
-        public static List<Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid>> SanitizeRhinoObjects(IEnumerable<RhinoObject> rhinoObjects) {
-            var rhinoObjectsRes = new List<Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid>>();
+        public static List<Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid, RhinoObject>> SanitizeRhinoObjects(IEnumerable<RhinoObject> rhinoObjects)
+        {
+
+            var rhinoObjectsRes = new List<Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid, RhinoObject>>();
 
             foreach (var rhinoObject in rhinoObjects)
             {
@@ -79,7 +81,7 @@ public static Rhino.Geometry.Mesh[] GetMeshes(RhinoObject rhinoObject) {
                 if (isValidGeometry && rhinoObject.ObjectType != ObjectType.InstanceReference)
                 {
                     // None-block. Just add it to the result list
-                    rhinoObjectsRes.Add(new Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid>(GetMeshes(rhinoObject), mat, renderMatId));
+                    rhinoObjectsRes.Add(new Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid, RhinoObject>(GetMeshes(rhinoObject), mat, renderMatId, rhinoObject));
                 } else if (rhinoObject.ObjectType == ObjectType.InstanceReference) {
                     // Cast to InstanceObject/BlockInstance
                     var instanceObject = (InstanceObject)rhinoObject;
@@ -97,7 +99,7 @@ public static Rhino.Geometry.Mesh[] GetMeshes(RhinoObject rhinoObject) {
                         }
 
                         // Add the exploded, transformed geo to the result list
-                        rhinoObjectsRes.Add(new Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid>(meshes, mat, renderMatId));
+                        rhinoObjectsRes.Add(new Tuple<Rhino.Geometry.Mesh[], Rhino.DocObjects.Material, Guid, RhinoObject>(meshes, mat, renderMatId, item.rhinoObject));
                     }
                 } else {
                     // TODO: Should give better error message here.
@@ -107,57 +109,6 @@ public static Rhino.Geometry.Mesh[] GetMeshes(RhinoObject rhinoObject) {
             return rhinoObjectsRes;
         }
 
-        public static void ExportText(MemoryStream outStream, IEnumerable<RhinoObject> rhinoObjects, glTFExportOptions exportOptions)
-        {
-            RootModel mdl = new RootModel(exportOptions);
-
-            var sanitizedRhinoObjects = SanitizeRhinoObjects(rhinoObjects);
-
-            foreach (var kv in sanitizedRhinoObjects)
-            {
-                // Regular objects
-                if (exportOptions.UseDracoCompression)
-                {
-                    mdl.AddRhinoObjectDraco(kv.Item1, kv.Item2, kv.Item3);
-                }
-                else
-                {
-                    mdl.AddRhinoObject(kv.Item1, kv.Item2, kv.Item3);
-                }
-
-                foreach (var mesh in kv.Item1) {
-                    mesh.Dispose();
-		        }
-            }
-
-            var json = mdl.SerializeToJSON();
-            byte[] jsonBytes = Encoding.ASCII.GetBytes(json);
-
-            outStream.Write(jsonBytes, 0, jsonBytes.Length);
-            outStream.Flush();
-        }
-
-        public static void ExportBinary(MemoryStream outStream, IEnumerable<RhinoObject> rhinoObjects, glTFExportOptions exportOptions)
-        {
-            RootModel mdl = new RootModel(exportOptions);
-
-            var sanitizedRhinoObjects = SanitizeRhinoObjects(rhinoObjects);
-
-            foreach (var kv in sanitizedRhinoObjects)
-            {
-                // Regular objects
-                if (exportOptions.UseDracoCompression) {
-                    mdl.AddRhinoObjectDraco(kv.Item1, kv.Item2, kv.Item3);
-                } else {
-                    mdl.AddRhinoObject(kv.Item1, kv.Item2, kv.Item3);
-                }
-            }
-
-            mdl.SerializeToGLB(outStream);
-
-            outStream.Flush();
-        }
-
         public static int AddAndReturnIndex<T>(this List<T> list, T item)
         {
             list.Add(item);