Upgrading to Unity5 and adding support for merging multiple meshes prior to export

unity/Assets/OBJ-IO/Editor/OBJEditor.cs

@@ -1,50 +1,99 @@
-
-using System;
+using System;
+using System.Collections.Generic;
 using System.IO;
-using System.Collections;
 
-using UnityEngine;
 using UnityEditor;
-
+using UnityEngine;
 using UnityExtension;
 
+
 public class OBJWindow : EditorWindow
 {
 	//------------------------------------------------------------------------------------------------------------
-	private MeshFilter m_MeshFilter = null; 
-
-    //------------------------------------------------------------------------------------------------------------
-    [MenuItem("OBJ-IO/OBJ Mesh Exporter")]
-    public static void Execute()
-    {
-        OBJWindow.GetWindow<OBJWindow>();
-    }
-
-    //------------------------------------------------------------------------------------------------------------
-    private void OnGUI()
-    {
-        m_MeshFilter = (MeshFilter)EditorGUILayout.ObjectField("MeshFilter", m_MeshFilter, typeof(MeshFilter), true);
-
-		if (m_MeshFilter != null)
+	private Transform m_root = null;
+
+	//------------------------------------------------------------------------------------------------------------
+	[MenuItem("Window/OBJ-IO Mesh Exporter")]
+	public static void Execute()
+	{
+		OBJWindow.GetWindow<OBJWindow>();
+	}
+
+	[MenuItem("CONTEXT/Transform/OBJ-IO Export Mesh")]
+	public static void ExportTransform(MenuCommand command)
+	{
+		var selection = command.context as Transform;
+		ExportMesh(selection);
+	}
+
+	[MenuItem("CONTEXT/Transform/OBJ-IO Export Mesh", true)]
+	public static bool CheckTransformExport(MenuCommand command)
+	{
+		var selection = command.context as Transform;
+		if (selection == null) 
 		{
-			if (GUILayout.Button("Export OBJ"))
-			{
-				var lOutputPath = EditorUtility.SaveFilePanel("Save Mesh as OBJ", "", m_MeshFilter.name + ".obj", "obj");
-
-				if (File.Exists(lOutputPath))
-				{
-					File.Delete(lOutputPath);
-				}
-
-				var lStream = new FileStream(lOutputPath, FileMode.Create);
-				var lOBJData = m_MeshFilter.sharedMesh.EncodeOBJ();
-				OBJLoader.ExportOBJ(lOBJData, lStream);
-				lStream.Close();
+			return false;
+		}
+
+		return selection.GetComponent<MeshFilter>() != null || selection.GetComponentInChildren<MeshFilter>() != null;
+	}
+
+	[MenuItem("CONTEXT/MeshFilter/OBJ-IO Export Mesh")]
+	public static void ExportMeshFilter(MenuCommand command)
+	{
+		var selection = command.context as MeshFilter;
+		ExportMesh(selection.transform);
+	}
+
+
+	//------------------------------------------------------------------------------------------------------------
+	private void OnGUI()
+	{
+		m_root = (Transform)EditorGUILayout.ObjectField("Root", m_root, typeof(Transform), true);
+
+		if (m_root == null)
+		{
+			GUILayout.Label("Please provide a Transform  which contains (including it's children)  at least on or more MeshFilter component");
+			return;
+		}
+
+		if (GUILayout.Button("Export OBJ"))
+		{
+			ExportMesh(m_root);
+		}
+	}
+
+	private static void ExportMesh(Transform root) {
+		var meshFilters = new List<MeshFilter>();
+		meshFilters.AddRange(root.GetComponents<MeshFilter>());
+		meshFilters.AddRange(root.GetComponentsInChildren<MeshFilter>());
+
+		Mesh mesh;
+		if (meshFilters.Count > 0) {
+			CombineInstance[] combine = new CombineInstance[meshFilters.Count];
+			for (int i = 0; i < meshFilters.Count; ++i) {
+				combine[i].mesh = meshFilters[i].sharedMesh;
+				combine[i].transform = meshFilters[i].transform.localToWorldMatrix;
 			}
+
+			mesh = new Mesh();
+			mesh.CombineMeshes(combine);
+			mesh.Optimize();
+			mesh.name = root.name;
+		} else {
+			return;
 		}
-		else
+
+		var lOutputPath = EditorUtility.SaveFilePanel("Save Mesh as OBJ", "", root.name + ".obj", "obj");
+
+		if (File.Exists(lOutputPath))
 		{
-			GUILayout.Label("Please provide a MeshFilter");
+			File.Delete(lOutputPath);
 		}
-    }
+
+		var lStream = new FileStream(lOutputPath, FileMode.Create);
+		var lOBJData = mesh.EncodeOBJ();
+		OBJLoader.ExportOBJ(lOBJData, lStream);
+		lStream.Close();
+}
 }

unity/Assets/OBJ-IO/Examples/Meshes/Materials/Teapot001Mat.mat

@@ -0,0 +1,145 @@
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