always use valid filename when exporting

replace any invalid characters with an underscore

Author: vkovec

Assets/FbxExporters/Editor/ConvertToModel.cs

@@ -76,7 +76,8 @@ private static List<GameObject> OnConvertInPlace (GameObject [] unityActiveGOs)
                 string dirPath = Path.Combine (Application.dataPath, "Objects");
 
                 for(int n = 0; n < gosToExport.Length; n++){
-                    filePaths[n] = Path.Combine (dirPath, gosToExport[n].name + ".fbx");
+                    string filename = ConvertToValidFilename (gosToExport [n].name + ".fbx");
+                    filePaths[n] = Path.Combine (dirPath, filename);
                 }
 
                 string[] fbxFileNames = new string[filePaths.Length];
@@ -136,6 +137,11 @@ private static List<GameObject> OnConvertInPlace (GameObject [] unityActiveGOs)
                 return result;
             }
 
+            private static string ConvertToValidFilename(string filename)
+            {
+                return System.Text.RegularExpressions.Regex.Replace (filename, "[" + new string(Path.GetInvalidFileNameChars()) + "]", "_");
+            }
+
             private static void SetupImportedGameObject(GameObject orig, GameObject imported)
             {
                 Transform importedTransform = imported.transform;