Moved OpenGL renderering code into its own class for future optimizations

lib/objects/tree.rb

@@ -3,9 +3,11 @@ class IMICFPS
     def setup
       bind_model(ModelLoader.new(type: :obj, file_path: "objects/tree.obj", game_object: self))
       vert = @terrain.find_nearest_vertex(self, 4.5)
-      self.x = vert.x
-      self.y = vert.y
-      self.z = vert.z
+      if vert
+        self.x = vert.x
+        self.y = vert.y
+        self.z = vert.z
+      end
     end
 
     # def update