Visualization of three-dimensional structure during computer-aided design

The visual image presented to an engineer using a computer‐aided design (CAD) system influences design activities such as decision making, problem solving, cognizance of complex relationships, and error correction. Because of the three‐dimensional (3‐D) nature of the object being created, an important attribute of the CAD visual interface concerns the various methods of presenting depth on the display's two‐dimensional (2‐D) surface. The objective of this research is to examine the effects of stereopsis on subjects’ ability to (a) accurately transfer to, and retrieve from, long‐term memory spatial information about 3‐D objects; and (b) visualize spatial characteristics in a quick and direct manner. Subjects were instructed to memorize the shape of a 3‐D object presented on a stereoscopic CRT during a study period. Following the study period, a series of static trial stimuli were shown. Each trial stimulus was rotated (relative to the original) about the vertical axis in one of six 36° increments between 0...