Hi,
Procedural tools are what makes possible to create huge detailed worlds.
Ubisoft GDC team got an interesting presentation about Houdini tools they used for terrain procedural generation, procedural texturing , roads, rivers or procedural town creation.
And some insight about optimisation to keep it playable.
They also used procedural tool to quickly make different buidlings
Star Citizen showcased their procedural tools to make it possible to create planet cities or entire indoor levels in some minutes.
