The Generation and Shadow Display of Graphics for Objects of Axial Symmetrs

This paper introduces the graphics processing technology of generation and shadow display of graphics for objects of axial symmetry by giving samples. The main contents indude: the generation of needful contour of object surface; the approximation of object surface with triangle facet (surf ace elements); the calculation of the grey level of the bounding surface elements in the light of the mode of illumination; the position of view point and the strength and orien tation of the light source(the eliminatition of hidden surface is completed while calculating the internal grey level of the bounding surface elements. This technology results in the realization of rapid display of graphics shadow.