diff --git a/conv3d/model.py b/conv3d/model.py
index 4649747..1964e1b 100644
--- a/conv3d/model.py
+++ b/conv3d/model.py
@@ -7,9 +7,9 @@ class Vertex:
         self.z = z
 
     def from_array(self, arr):
-        self.x = arr[0] if len(arr) > 0 else None
-        self.y = arr[1] if len(arr) > 1 else None
-        self.z = arr[2] if len(arr) > 2 else None
+        self.x = float(arr[0]) if len(arr) > 0 else None
+        self.y = float(arr[1]) if len(arr) > 1 else None
+        self.z = float(arr[2]) if len(arr) > 2 else None
         return self
 
 Normal = Vertex
@@ -22,9 +22,9 @@ class FaceVertex:
         self.normal = normal
 
     def from_array(self, arr):
-        self.vertex  = arr[0] if len(arr) > 0 else None
-        self.texture = arr[1] if len(arr) > 1 else None
-        self.normal  = arr[2] if len(arr) > 2 else None
+        self.vertex  = int(arr[0]) if len(arr) > 0 else None
+        self.texture = int(arr[1]) if len(arr) > 1 else None
+        self.normal  = int(arr[2]) if len(arr) > 2 else None
         return self
 
 class Face:
@@ -70,6 +70,22 @@ class ModelParser:
                 line = line.rstrip()
                 self.parse_line(line)
 
+    def gl_draw(self):
+
+        import OpenGL.GL as gl
+
+        gl.glColor3f(1.0,0.0,0.0)
+        gl.glBegin(gl.GL_QUADS)
+        for face in self.faces:
+            v1 = self.vertices[face.a.vertex]
+            v2 = self.vertices[face.b.vertex]
+            v3 = self.vertices[face.c.vertex]
+            gl.glVertex3f(v1.x, v1.y, v1.z)
+            gl.glVertex3f(v2.x, v2.y, v2.z)
+            gl.glVertex3f(v3.x, v3.y, v3.z)
+        gl.glEnd()
+
+
 class Exporter:
     def __init__(self, model):
         self.model = model
diff --git a/conv3d/obj.py b/conv3d/obj.py
index 943ae00..87384a1 100644
--- a/conv3d/obj.py
+++ b/conv3d/obj.py
@@ -31,7 +31,7 @@ class OBJParser(ModelParser):
             for i in range(len(splits)):
                 for j in range(len(splits[i])):
                     if splits[i][j] is not '':
-                        splits[i][j] = str(int(splits[i][j]) - 1)
+                        splits[i][j] = int(splits[i][j]) - 1
 
             self.add_face(Face().from_array(splits))
 
@@ -43,19 +43,19 @@ class OBJExporter(Exporter):
         string = ""
 
         for vertex in self.model.vertices:
-            string += "v " + ' '.join([vertex.x, vertex.y, vertex.z]) + "\n"
+            string += "v " + ' '.join([str(vertex.x), str(vertex.y), str(vertex.z)]) + "\n"
 
         string += "\n"
 
         if len(self.model.tex_coords) > 0:
             for tex_coord in self.model.tex_coords:
-                string += "vt " + ' '.join([tex_coord.x, tex_coord.y]) + "\n"
+                string += "vt " + ' '.join([str(tex_coord.x), str(tex_coord.y)]) + "\n"
 
             string += "\n"
 
         if len(self.model.normals) > 0:
             for normal in self.model.normals:
-                string += "vn " + ' '.join([normal.x, normal.y, normal.z]) + "\n"
+                string += "vn " + ' '.join([str(normal.x), str(normal.y), str(normal.z)]) + "\n"
 
             string += "\n"
 
@@ -64,15 +64,15 @@ class OBJExporter(Exporter):
             arr = []
             for v in [face.a, face.b, face.c]:
                 sub_arr = []
-                sub_arr.append(str(int(v.vertex) + 1))
+                sub_arr.append(str(v.vertex + 1))
                 if v.normal is None:
                     if v.texture is not None:
                         sub_arr.append('')
-                        sub_arr.append(str(int(v.texture) + 1))
+                        sub_arr.append(str(v.texture + 1))
                 elif v.texture is not None:
-                    sub_arr.append(str(int(v.texture) + 1))
+                    sub_arr.append(str(v.texture + 1))
                     if v.normal is not None:
-                        sub_arr.append(str(int(v.normal) + 1))
+                        sub_arr.append(str(v.normal + 1))
                 arr.append('/'.join(sub_arr))
 
             string += ' '.join(arr) + '\n'
diff --git a/conv3d/ply.py b/conv3d/ply.py
index 0cc2f48..5c7a86e 100644
--- a/conv3d/ply.py
+++ b/conv3d/ply.py
@@ -65,7 +65,7 @@ class PLYContentParser:
         if self.current_element.name == 'vertex':
             self.parent.add_vertex(Vertex().from_array(split))
         elif self.current_element.name == 'face':
-            self.parent.add_face(Face(FaceVertex(split[1]), FaceVertex(split[2]), FaceVertex(split[3])))
+            self.parent.add_face(Face(FaceVertex(int(split[1])), FaceVertex(int(split[2])), FaceVertex(int(split[3]))))
 
         self.counter += 1
 
@@ -98,10 +98,10 @@ class PLYExporter(Exporter):
 
         # Content of the model
         for vertex in self.model.vertices:
-            string += vertex.x + " " + vertex.y + " " + vertex.z + "\n"
+            string += str(vertex.x) + " " + str(vertex.y) + " " + str(vertex.z) + "\n"
 
         for face in self.model.faces:
-            string += "3 " + face.a.vertex + " " + face.b.vertex + " " + face.c.vertex + "\n"
+            string += "3 " + str(face.a.vertex) + " " + str(face.b.vertex) + " " + str(face.c.vertex) + "\n"
 
         return string