Abstract: In the radiosity calculation, the intersection decision is effected by the ray-casting method with respect to one portion of element of the polygon interior with the use of the coherence of the dodow so as to obtain the illumination intention and the interpolation domain of the form-factor from the intersection decision results. As the radiosity calculation is effected in accordance with the algorithm that the linear, non-linear interpolation equations are properly used in accordance with the precision to use the interpolation calculation in the interior portion the interpolation domain, the intersection decision frequency is sharply reduced so that the whole processing can be effected with higher speed.

Abstract: A linear calculating equipment comprises a memory for storing a coefficient matrix, a known vector and an unknown vector of a given system of linear equations, a pivoting device for choosing pivots of the matrix, a plurality of preprocessors for executing K steps of preprocessing for multi-pivot simultaneous elimination, an updating device for updating the elements of the matrix and the components of the vectors, a register set for storing values of the variables, a back-substitution device for obtaining a solution and a main controller for controlling the linear calculating equipment as a whole.

Abstract: A graphic display device displays a three-dimensional polyhedral object on a two-dimensional screen in accordance with hidden surface processing. The device includes a plurality of pixel processors corresponding to each of the pixels on one scan line on the screen. The hidden surface processing device includes an error register which stores data relating to errors of a plane segment on one scan line nearest to pixels at its boundaries and error information indicating whether an error is due to a left boundary or a right boundary, and an error data bus which reads the storage contents of the error register together with luminance data. The hidden surface processing device obtains luminance data relating to a plane to be displayed at high speed. The luminance data and the boundary error data are used for anti-aliasing processing. An anti-aliasing method executes corrections for boundaries of the pixels using two successive pixels on one scan line.

Abstract: A supercharger control in an automobile engine comprising an intake passage having an air pump for supercharging air to be fed to the engine, a bypass passage bypassing the air pump and having a control valve for opening and closing the bypass passage, an electromagnetic clutch for selectively coupling and decoupling the air pump with and from an output shaft of the engine, and a control device for controlling both the air pump and the control valve in dependence on the degree of requirement for acceleration represented by the load on the engine or the position of an automobile transmission.