Initial commit

.gitattributes

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+* -text
+
+*.cs        text eol=lf diff=csharp
+*.shader    text eol=lf
+*.cginc     text eol=lf
+*.hlsl      text eol=lf
+*.compute   text eol=lf
+
+*.meta      text eol=lf

.gitignore

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+# Windows
+Thumbs.db
+Desktop.ini
+
+# macOS
+.DS_Store
+
+# Code Editors
+/.idea
+/.vscode
+/*.csproj
+/*.sln
+*.swp
+*.vcxproj.user
+
+# Unity
+/Library
+/Logs
+/Temp

Assets/Editor/MgiImporter.cs

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+using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEditor;
+using UnityEditor.Experimental.AssetImporters;
+using Path = System.IO.Path;
+
+namespace Mgi
+{
+    [ScriptedImporter(1, "mgi")]
+    class MgiImporter : ScriptedImporter
+    {
+        #region ScriptedImporter implementation
+
+        public override void OnImportAsset(AssetImportContext context)
+        {
+            var gameObject = new GameObject();
+            var mesh = ImportAsMesh(context.assetPath);
+
+            var meshFilter = gameObject.AddComponent<MeshFilter>();
+            meshFilter.sharedMesh = mesh;
+
+            var meshRenderer = gameObject.AddComponent<MeshRenderer>();
+            meshRenderer.sharedMaterial =
+                AssetDatabase.GetBuiltinExtraResource<Material>("Default-Diffuse.mat");
+
+            context.AddObjectToAsset("prefab", gameObject);
+            if (mesh != null) context.AddObjectToAsset("mesh", mesh);
+
+            context.SetMainObject(gameObject);
+        }
+
+        #endregion
+
+        #region Reader implementation
+
+        Mesh ImportAsMesh(string path)
+        {
+            var mesh = new Mesh();
+            mesh.name = Path.GetFileNameWithoutExtension(path);
+            mesh.SetVertices(new [] { new Vector3(0, 0, 0), new Vector3(0, 1, 0), new Vector3(1, 0, 0) });
+            mesh.SetIndices(new [] { 0, 1, 2 }, MeshTopology.Triangles, 0);
+            mesh.UploadMeshData(true);
+            return mesh;
+        }
+
+        #endregion
+    }
+}