How to change textures over time?

Hey guys, has you guys know already, iā€™m working on a Indi GTA, and i want the textures of my building change over time, for example:
Change from daytime texture to night time texture. I tried with spotlights on my buildings windows, but obviously my framerate droped dramaticly from 120 to 8 fps :confused: so an obvious solution could be change the texture of the buildings when is night time, so these one can have its windows lighted, in textures of course :wink: Is this possible?

Well you can use 2 separate materials for each building, 1 for the actual building, and 1 for the window. Then you can make a dynamic material out of the window texture and turn it to yellow over time.