3DCAD, also called 'Parametric Modeling' MCAD (Mechanical Cumputer Aided Design) is a type of 3D modelling in which virtual objects take on the physical properties of 'real' objects. This basic concept is built upon with rendering and 2D documentation facilities(to name a few) which allow rich output to be realized fro modern 3DCAD systems, both 2D and 3D.
Design and Documentation