How to add the building models' specular and normal texture effectively?

[How to add the building models' specular and normal texture effectively?]

Glad you could help me solve the problem

[How to add the building models' specular and normal texture effectively?]

How to add the building models' specular and normal texture? Unlike vehicle model that unwarp the UV, I use a lot of single seamless map, in Oxygen2, should I choose every face for each own rvmat files? Is there a way I could do it effectively? Appreciate it~~