Graphic shading device

Abstract

Abstract PURPOSE:To speed up a processing by calculating the interpolation of a normal vector with the use of a level difference based on a parametric curve, and also calculating the operation of an inner product at each point on a line segment with the use of the level difference based on the parametric curve. CONSTITUTION:A first arithmetic means 2 operates and generates the normal vector to have respectively intermpolated the respective terminations of the line segment of a polygon dissolved along a scanning line based on the normal vector of the two known points on the graphic with the use of the parametric curve and by using the level difference. A second arithmetic means 3 respectively regards the vector directed to a light source direction and the vector directed to a view point direction as the constant vectors, and the inner product of the vectors and the normal vector, which is obtained by further interpolating the normal vector interpolated at both terminations of the line segment dissolved along the scanning line, is operated and generated by a (n)-th degree polynominal. A color calculating means 4 calculates colors at the respective points in the displayed three-dimensional graphic, and displays a calculation result to a display device 1.

Inventors

• 👤 Toshiya Mima
• 👤 美間　俊哉

Bibliographic Details