Grimrock

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for x = 1, 3 do
	local name = {"dungeon", "temple", "prison"}

	defineObject{
		--name = "dungeon_alcove_combiner",
		name = string.format("%s_alcove_combiner", name[x]),
		class = "Alcove",
		--model = string.format("assets/models/env/dungeon_wall_alcove.fbx",
		model = string.format("assets/models/env/%s_wall_alcove.fbx", name[x]),
		replacesWall = true,
		anchorPos = vec(0, 0.85, 0.2),
		targetPos = vec(0,1.3,0),
		targetSize = vec(0.6, 0.5, 0.6),
		placement = "wall",
		editorIcon = 8,
		onInsertItem = function(self, item)
						   local first_itemName  = "pitroot_bread"                  
						   local second_itemName = "dagger"
						   local prize = "blueberry_pie"
						   local soundEffect = "item_drop"  				--Defaults to item_drop, but can be changed to suit
						   if item.name == first_itemName or           		--excludes all other item names
						       item.name == second_itemName then
						      
						      for item2 in self:containedItems() do  		--having found one of the two names, it checks the surface for the other one

						         if item2.name ~= item.name then     		--ensures that it excludes duplicate items fed to the next check.  '~='  means "not equal"

						            if item2.name == first_itemName or    	--if it finds a match, it destroys it, and the other one, then adds the prize to the shelf
						               item2.name == second_itemName then
						               print(item.name, item2.name)
						                  setMouseItem()					--must clear mouseItem ~else it remains a bad object on the mouse.	
						                  item2:destroy()
						                  self:addItem(spawn(prize))
						                  playSound(soundEffect)			 --provide sound effect 
						                  					 		
						                  return false                       --must return false to cancel Insert, and MUST exit the loop at first run, or it will compare with destroyed item [==crash]
						            end
						            
						         end 
						      end
						   end
						return true   
	end
	}

end