1. At an object-oriented design application in a computerized environment comprising a computer-aided design (or CAD)-based application programs that implements user design choices with corresponding CAD design elements in a record or linear-based database, a computer-implemented method of using the object-oriented design program to instantly render user designs made in the CAD program, comprising the acts of: identifying one or more user requests to render in a three-dimensional user interface one or more design elements created in a separate CAD user interface; receiving one or more CAD design elements that represent one or more CAD block or line design elements created by the user in the CAD user interface; receiving one or more files that identify features of the design elements that the user selected in the CAD user interface; and automatically displaying the CAD design elements as three-dimensional design elements in the three-dimensional user interface using previously-generated rendering instructions.