Unreal Engine 4 virtual texturing support ?

[anonymous_user_bcf66e2c]

Could anyone tell me what this “VirtualTexture” means in UE4? I don’t think this is exactly the same thing as that Virtual Texture used in FC4 or Mega-texture of id tech 5. So, what is it?

“If set to 1, textures will use virtual memory so they can be partially resident.”