A graphic display apparatus includes a geometry transforming part for inputting graphic data of a target object and transforming the graphic data into coordinate values of a device coordinate system which is used by the graphic display apparatus, an area calculation part for calculating an area of a...http://www.google.fr/patents/US5499324?utm_source=gb-gplus-shareBrevet US5499324 - Graphic display apparatus with improved shading capabilities
Graphic display apparatus with improved shading capabilities
