2-dimensional (2D) construction drawings or PDF. drawings, are drawn with diagonal, vertical, and. horizontal lines using black ink on white paper. Traditional 2D drawings are flat and are a useful way. to obtain simplified measurements and broad.3D drawing (or 3D sketching) is one of the most commonly used techniques by architects, civil construction professionals, and graphic designers. It allows builders to tackle the geometric elements of height, width, and depth in their 3D projects.