Abstract
Technical illustrations often adopt exaggerated images rather than geometrically correct projections of models in order to emphasize the properties of shapes to customers. Besides of changing colors and highlighting, geometrical sizes are varied to attract attention. This paper introduces a geometrical tool to modify three-dimensional models in perspective space. The data of models are kept unchanged. An image close to an eye is often exaggerated in nomal photo processing. Our method of projection helps the work of technical illustrators.
