Minor tweaks to some of the objects to make indexing them easier.

engine.py

@@ -43,3 +43,9 @@ class Mesh:
 				row3 = self.vertices[int(tmp[3]) - 1]
 
 				self.triangles.append(Triangle(Matrix3x3(row1, row2, row3)))
+				
+	def __getitem__(self, key):
+		return self.triangles[key]
+		
+	def __len__(self):
+		return len(self.triangles)

triangle.py

@@ -5,3 +5,6 @@ class Triangle:
 		self.coords = coords # Matrix3x3
 		self.object_id = None
 		self.color = None
+		
+	def __getitem__(self, key):
+		return self.coords[key]