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    • 9. 发明授权
    • Three dimensional graphics processing with pre-sorting of surface
portions
    • 三维图形处理,预处理表面部分
    • US5579454A
    • 1996-11-26
    • US937701
    • 1992-09-01
    • Adam BillyardPaul OttoDavid Lau-Kee
    • Adam BillyardPaul OttoDavid Lau-Kee
    • G06T15/40
    • G06T15/405
    • To effect hidden surface removal, polygons making up a three dimensional object are initially ordered using a Topological Sort into, for example, three rendering order lists corresponding to orthogonal axis. When the object is to be represented from a given view direction, the view direction is compared to the axis and the rendering list corresponding to the closest match is selected. Polygons are then rendered in list order, backward facing polygons being omitted. Performing the ordering at the polygon level, in an initial step, saves computation and consequently enables the projection and rendering processes to be speeded up to provide real time interactive three dimensional graphics. The Topological Sorting process is particularly computationally effective.
    • 为了实现隐藏的表面去除,构成三维对象的多边形最初使用拓扑排序来排序,例如对应于正交轴的三个渲染顺序列表。 当从给定的视图方向来表示对象时,将视图方向与轴进行比较,并且选择与最接近的匹配相对应的渲染列表。 然后以列表顺序呈现多边形,省略向后的多边形。 在初始步骤中,在多边形级别执行排序可以节省计算量,从而使投影和渲染过程能够加快,以提供实时的交互式三维图形。 拓扑排序过程在计算上特别有效。