Hitachi, Ltd.

Toru Sakaibara

Ryo Fujita

Toshiyuki Kuwana

Hideyuki Hara

Motonobu Tonomura

Shigeo Tsujioka

Toshiharu Kawasaki

Toshihisa Aoshima

Toshinori Kajiura

Ryoichi Takamatsu

A plurality of texture data of a surface of an object to be displayed as viewed from a plurality of assumed directions are stored in a texture memory. When a CPU sends to a graphic processor information specifying a shape of the surface, a direction to view the surface and a texture in the texture memory as a command, a geometric operation unit produces read information of the texture memory based on the input information. A triangle generator reads the texture data corresponding to the view direction of the surface of the object by the read information for texture mapping. An image of the texture mapped image of the surface of the object is stored in a frame memory and displayed on a monitor. When there is no texture data corresponding to the view direction, a plurality of texture data closest thereto are read from the texture memory and interpolated to produce an appropriate texture data.

Method and apparatus for mapping texture on an object displayed at a

Intensities of light reflected from a surface of an object to be displayed are calculated as to values of an ambient light reflection component, a diffuse light reflection component, and a specular reflection component. Judgement is made as whether the calculated value of the specular reflection component exceed a predetermined value. Texture data are blended with a sum of the calculated ambient light reflection component value and the calculated diffuse light reflection component value. If it is judged that the calculated specular reflection component value exceeds the predetermined value, the specular reflection component value is added to the blended value of the texture data with the sum of the calculated ambient light reflection component value and the calculated diffuse light reflection component value.

Method and apparatus for non-disturbed specular reflections on textured

A main processor sends to a command distribution device a series of graphic commands including an attribute command updating the state of the attribute which designates a display mode, and a primitive command defining graphics to be displayed. The command distribution device sequentially distributes the series of graphic commands to a plurality of geometry processors which process the graphics according to the type of command. The primitive command is sent to any one of plurality of geometry processors. At least those of the attribute commands which relate to the attributes of display used by the geometry processors are sent to all the geometry processors. The pixel commands comprising the outputs of those geometry processors are sent to a pixel processor which generates an image corresponding to the pixel commands. The pixel processor arranges pixel commands from the plurality of geometry processors on the basis of the data on the allocation of commands received from the command distribute means and then displays the graphic in the form of geometry data.

Parallel graphics processor with graphics command distributor and

The display system and a thick line display method realizes a high-speed and accurate display of a thick line without any disorder even if a display range is to be processed by two or more clip frames when the thick line is to be displayed by parallel setting a reference line component and at least one additional line component which is obtained by parallel moving the reference line component in a display system such as an information processing unit that displays graphs. For this purpose, a clip frame showing a display range is expanded by a predetermined width equal to or larger than the total width of additional line components to be set at least at one side of the reference line component and the additional line component is obtained in that expanded frame, and the line component within the clip frame of the additional line component and the reference line component within the clip frame are displayed.

Method of displaying thick line and information unit and display system

An apparatus for shading a polyhedron at high speed is disclosed which includes the combination of a polygon-scan line conversion processor and an inner product interpolation processor for obtaining a pair of inner products of vectors indicative of a relation among the direction of a normal, the direction of a light source and the direction of a view point each viewed at a point within a polygon having a plurality of vertices, on the basis of the position of said point in the polygon and the direction of a normal at each of the vertices, a table searched on the basis of the inner products of vectors and holding a series of brightness data which have previously been calculated for a series of values of each of the inner products of vectors, a buffer for storing the result of table search for the above table, and a D/A conversion circuit for converting the result of table search into a signal which is used as a brightness control signal in a display device.

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Kawasaki, Japan

Toru Sakaibara