A surface model simulates an object only externally not giving a complete view of a structure.It’s used only for the projects where exteriors have more significance.

Surface modeling is not as sophisticated or complete as 3D solid modeling.There is a possibility of clash of various design elements here since a surface model cannot display the internal features of a structure.When a more complex structure is being used, this possibility increases. Architectural drawing services would need 3D solid modeling for design and drafting purposes in this case.