added support for ruby-prof, make trees jump to nearest vertex position.

lib/objects/tree.rb

@@ -2,7 +2,10 @@ class IMICFPS
   class Tree < GameObject
     def setup
       bind_model(ModelLoader.new(type: :obj, file_path: "objects/tree.obj", game_object: self))
-      self.y = @terrain.height_at(self)
+      vert = @terrain.find_nearest_vertex(self)
+      self.x = vert.x
+      self.y = vert.y
+      self.z = vert.z
     end
 
     # def update