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11. 发明授权

US4912659A Parallel surface processing system for graphics display 失效
标题翻译：平行表面处理系统，用于图形显示
公开(公告)号：US4912659A
公开(公告)日：1990-03-27
申请号：US115465
申请日：1987-10-30
申请人： Bob C. Liang
发明人： Bob C. Liang
IPC分类号： G06F17/50 , G06T15/00 , G06T17/20
CPC分类号： G06T17/20
摘要： A Pipeline and Parallel Processing system for generating Surface Patches for both Wireframe and Solid/Shaded Models in a Raster Graphics Display. The inputs to a Transformation Processor are the parameters for the Rational Bezier Surfaces: a 2-dimensional array of control points, and weights. The outputs are the coordinates of the corner points and the normals (to the surface) of the patches, which make up the surface. The system consists of three Pipeline stages: (1) A front-end processor fetches the data from memory and feeds the Transformation Processor; (2) four Floating Point Processors in Parallel for tessellating the surfaces into small patches; and (3) one Floating Point Processor for generating normals at the vertices of the small patches. The output is sent to the rest of the Graphics System for clipping, mapping, and shading.

12. 发明授权

US4855938A Hidden line removal method with modified depth buffer 失效
标题翻译：具有修改深度缓冲区的隐藏线删除方法
公开(公告)号：US4855938A
公开(公告)日：1989-08-08
申请号：US115455
申请日：1987-10-30
申请人： Jorge Gonzalez-Lopez , Bob C. Liang
发明人： Jorge Gonzalez-Lopez , Bob C. Liang
IPC分类号： G06T15/40 , G09B9/30
CPC分类号： G09B9/301 , G06T15/405
摘要： Polygon vertex data is processed in three steps to create a graphics display without hidden lines and without gaps in the displayed lines. The technique permits the processing of triangles rather than polygons having four or more sides. In the first step, the Z values for the display points for the visible edges of the polygons are identified and assigned a reserved value ZCLOSE in a frame buffer. In the second step, the polygons are tessellated into triangles and the Z values for the display points on the triangles are computed and each depth buffer storage location is updated so as to contain the value of points closest to the viewpoint while the frame buffer is written with a background color. In the final step, the Z values for the display points of the polygon edges are again computed and compared with the corresponding Z values in the depth buffer. The depth buffer is updated with the computed values if the stored value is equal to ZCLOSE or if the computed value represents a position closer to the viewpoint than the stored value and the frame buffer is then written with a foreground color for the display point in question.

13. 发明授权

US4805116A Interpolated display characteristic value generator 失效
标题翻译：插值显示特征值发生器
公开(公告)号：US4805116A
公开(公告)日：1989-02-14
申请号：US854965
申请日：1986-04-23
申请人： Bob C. Liang , Jorge Gonzalez-Lopez
发明人： Bob C. Liang , Jorge Gonzalez-Lopez
IPC分类号： G06F3/153 , G06F17/17 , G06T15/80 , G06F7/66
CPC分类号： G06T15/80 , G06F17/175
摘要： Method and apparatus for providing interpolated display characteristic values, such as intensity or Z value, for pels within a polygon to be displayed by a computer graphics display system. A scanning sequence generates pel addresses such that each pel address so generated is contiguous with a previously generated pel address. The parametric value rate of change in both the X and the Y direction is determined, and expressed as an integer value and a remainder quantity. The remainder quantity is used to determine a sequence, driven by pel address changes, by which the integer parametric value increment from pel to pel is incremented or decremented by one in a regular sequence that assures that the error in the computed parametric value for each pel never exceeds 0.5 parametric value units.
摘要翻译：为计算机图形显示系统要显示的多边形内的像素提供内插显示特征值（如强度或Z值）的方法和装置。扫描序列产生像素地址，使得如此生成的每个像素地址与先前生成的像素地址相邻。确定X和Y方向上的参数值变化率，并表示为整数值和余数。剩余量用于确定由像素地址变化驱动的序列，通过该顺序，从像素到像素的整数参数值增量以常规序列递增或递减1，以确保每个像素的计算参数值中的误差从不超过0.5个参数值单位。

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