Schattierungsverfahren und -gerät in einem Grafikrechner

摘要

A shading method and apparatus for computer graphics for approximating a curved surface with a plurality of polygons, inputting values to vertexes of the plurality of polygons and obtaining values inside the plurality of polygons with the input values for each vertex of the plurality of polygons by means of linear interpolation. A compensating computation (3, 4; 20, 21) in the vertical direction against the value of each vertex value so as to compute the value at the end point of a scan line is conducted. A compensating computation (6; 23) in the horizontal direction against the values of the end point of the scan line so as to compute the value at a start point on a coordinate grid point is conducted. A variation (1, 2, 5) to the value of the start point is added so as to obtain the value on each coordinate gridpoint.