Then (3D Virtual Building) an idea has invented in which 3D model constructed for the entire building before the actual building to discover, see and solve any clashes or problems before it happens on site.
It integrates all the drawings and designs in one 3d model because the construction process is carried out with the participation of many departments among the different specialties: architectural, civil, mechanical, electrical, plumbing & HVAC. And between many departments like technical office, procurement, tendering and supply chain. This huge amount of information usually generate conflicts & leans between the different disciplines usually detected during installation and after pouring concrete!