Grimrock

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function fadeColor(objectId, step, timer)
	if type(objectId) == "string" then
		local object = findEntity(objectId)		
		if object then 
			local function filter(target)
					for x = 1, 3 do
						if target[x] > 0 and target[x] <= 1 then
						  else target[x] = math.floor(target[x]+0.5)
						end
					end
					return target
				end
										
			if not object.model:getEmissiveColor() then 
				object.model:setEmissiveColor(vec())
			end
					
			local emColor = object.model:getEmissiveColor()	
			step = iff( step, vec(emColor[1]*step,emColor[2]*step,emColor[3]*step) , vec(emColor[1]*.01,emColor[2]*.01,emColor[3]*.01) )			
			object.model:setEmissiveColor( filter(emColor+step*(Time.deltaTime()*10)) )	
			
			emColor = object.model:getEmissiveColor()
			if (emColor[1] < 0.001 or emColor[1] >= 1) and
			   (emColor[2] < 0.001 or emColor[2] >= 1) and 
			   (emColor[3] < 0.001 or emColor[3] >= 1) then
				timer:stop()
			end	
		end
	end
end

--[[Usage:
	Connect timers to any of the example functions below; make more functions (one for each object) as needed.	
	
	For the examples, add three snake_staues to the map, and they will change colors. 
--]]

----------------------------------------------------------------------deletable examples:
-------------------------------------------------------------------------------
if snake_statue_1 and snake_statue_2 and snake_statue_3 then
	snake_statue_1.model:setEmissiveColor(vec(0,0,1))
	snake_statue_2.model:setEmissiveColor(vec(.001,-.9,0))
	snake_statue_3.model:setEmissiveColor(vec(1,1,0))
end
--[[
	To be affected, a color value must be greater or less than zero; zero values are ignored. 
	Non-zero color values will be proportionately incremented either brighter, or darker depending on 
	whether the step value is positive or negative. 
--]]
-------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------

function object1(stop)
	fadeColor("snake_statue_1", -.05, stop)  --negative step value darkens, positive value lightens
end

function object2(stop)
	fadeColor("snake_statue_2", .25, stop)  --negative step value darkens, positive value lightens
end

function object3(stop)
	fadeColor("snake_statue_3", -.1, stop)  --negative step value darkens, positive value lightens
end