diff --git a/conv3d/loadmodel.py b/conv3d/loadmodel.py
new file mode 100644
index 0000000..6271bd8
--- /dev/null
+++ b/conv3d/loadmodel.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+from .obj import is_obj, OBJParser
+from .ply import is_ply, PLYParser
+
+def load_model(path):
+    parser = None
+
+    if is_obj(path):
+        parser = OBJParser()
+    elif is_ply(path):
+        parser = PLYParser()
+    else:
+        raise Exception("File format not supported")
+
+    parser.parse_file(path)
+
+    return parser
diff --git a/conv3d/model.py b/conv3d/model.py
index fbd0fbc..4649747 100644
--- a/conv3d/model.py
+++ b/conv3d/model.py
@@ -74,3 +74,4 @@ class Exporter:
     def __init__(self, model):
         self.model = model
 
+
diff --git a/conv3d/obj.py b/conv3d/obj.py
index c1c941c..943ae00 100644
--- a/conv3d/obj.py
+++ b/conv3d/obj.py
@@ -3,6 +3,9 @@
 from .model import ModelParser, Exporter, Vertex, TexCoord, Normal, FaceVertex, Face
 from functools import reduce
 
+def is_obj(filename):
+    return filename[-4:] == '.obj'
+
 class OBJParser(ModelParser):
 
     def __init__(self):
@@ -69,7 +72,7 @@ class OBJExporter(Exporter):
                 elif v.texture is not None:
                     sub_arr.append(str(int(v.texture) + 1))
                     if v.normal is not None:
-                        sub_arr.append(str(int(v.normal + 1)))
+                        sub_arr.append(str(int(v.normal) + 1))
                 arr.append('/'.join(sub_arr))
 
             string += ' '.join(arr) + '\n'
diff --git a/conv3d/ply.py b/conv3d/ply.py
index 7f09924..0cc2f48 100644
--- a/conv3d/ply.py
+++ b/conv3d/ply.py
@@ -2,6 +2,9 @@
 
 from .model import ModelParser, Exporter, Vertex, Face, FaceVertex
 
+def is_ply(filename):
+    return filename[-4:] == '.ply'
+
 class PLYParser(ModelParser):
 
     def __init__(self):
@@ -102,4 +105,3 @@ class PLYExporter(Exporter):
 
         return string
 
-
diff --git a/obj2ply.py b/obj2ply.py
index 99342ed..68c92a9 100755
--- a/obj2ply.py
+++ b/obj2ply.py
@@ -3,8 +3,8 @@
 import argparse
 import os
 
-from conv3d.obj import OBJParser
 from conv3d.ply import PLYExporter
+from conv3d.loadmodel import load_model
 from functools import partial
 
 def check_path(path, should_exist):
@@ -17,8 +17,7 @@ def check_path(path, should_exist):
     return path
 
 def main(args):
-    parser = OBJParser()
-    parser.parse_file(args.input)
+    parser = load_model(args.input)
     exporter = PLYExporter(parser)
     result = str(exporter)
 
diff --git a/ply2obj.py b/ply2obj.py
index 03e4b56..b442d42 100755
--- a/ply2obj.py
+++ b/ply2obj.py
@@ -4,7 +4,7 @@ import argparse
 import os
 
 from conv3d.obj import OBJExporter
-from conv3d.ply import PLYParser
+from conv3d.loadmodel import load_model
 from functools import partial
 
 def check_path(path, should_exist):
@@ -17,8 +17,7 @@ def check_path(path, should_exist):
     return path
 
 def main(args):
-    parser = PLYParser()
-    parser.parse_file(args.input)
+    parser = load_model(args.input)
     exporter = OBJExporter(parser)
     result = str(exporter)