Combines object-based CAD, 3D direct modeling, and 2D editing elements for AEC design, Renga Architecture enables users to design buildings with complex architectural forms and solve non-standard issues with built-in style editor and model explorer. Full-scale (1:1) 2D editor operates in drawing mode, and drafting views are associated with 3D model. User-sensitive interface offers commands, grouped by function, in numbers intended not to overwhelm users as to increase usability.