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1. 发明授权

US6097395A Dynamic selection of lighting coordinates in a computer graphics system 失效
标题翻译：在计算机图形系统中动态选择照明坐标
公开(公告)号：US6097395A
公开(公告)日：2000-08-01
申请号：US67550
申请日：1998-04-28
申请人： Kathleen A. Harris , David Pinedo
发明人： Kathleen A. Harris , David Pinedo
IPC分类号： G06T15/50 , G06F163/00
CPC分类号： G06T15/506
摘要： A computer graphics system includes a lighting system that performs lighting efficiently by selecting dynamically the lighting space in which lighting calculations are to be performed to thereby minimize resources required to be expended to perform lighting. A particular preferred lighting coordinate system is then selected, based upon particular criteria, and the light source information is transformed to the selected coordinate system (if necessary) where lighting is performed. The dynamic selection can take many objective indicia into account, such as whether functions other than lighting must be performed in either of the coordinate systems, whether transformation of the lighting information is possible and the relative efficiencies of performing lighting in one coordinate system verses the other coordinate system. In another aspect, a lighting subsystem for use in a computer graphics system includes a dynamic light space selector for selecting dynamically a lighting space for performing lighting, a lighting processor for performing lighting and at least one switch operatively associated with and controlled by the dynamic light space selector to selectively enable the transformation of data from a first coordinate space to a second coordinate space prior to being input into the lighting processor. The dynamic light space selector thus controls the switch to operatively determine which coordinate system will be used to perform lighting in the lighting processor.
摘要翻译：计算机图形系统包括照明系统，其通过动态地选择要进行照明计算的照明空间来有效地执行照明，从而最小化需要消耗的光进行照明。然后基于特定标准选择特定的优选照明坐标系，并且在执行照明的情况下将光源信息变换到选定的坐标系（如果需要）。动态选择可以考虑许多客观标记，诸如是否必须在任一坐标系中执行除了照明之外的功能，是否可以改变照明信息，并且在一个坐标系中执行照明的相对效率与其他坐标系相对照坐标系。另一方面，在计算机图形系统中使用的照明子系统包括动态光空间选择器，用于动态地选择用于执行照明的照明空间，用于执行照明的照明处理器和与动态光可操作地相关联并由其控制的至少一个开关空间选择器，用于在被输入到照明处理器之前选择性地启用从第一坐标空间到第二坐标空间的数据变换。因此，动态光空间选择器控制开关以可操作地确定哪个坐标系将用于在照明处理器中执行照明。

2. 发明授权

US06304265B1 System for distinguishing front facing and back facing primitives in a computer graphics system using area calculations in homogeneous coordinates 失效
标题翻译：使用均匀坐标下的区域计算来区分计算机图形系统中的正面和背面原语的系统
公开(公告)号：US06304265B1
公开(公告)日：2001-10-16
申请号：US09016171
申请日：1998-01-30
申请人： Kathleen A. Harris , Kimberly Wagner Jensen
发明人： Kathleen A. Harris , Kimberly Wagner Jensen
IPC分类号： G06T1540
CPC分类号： G06T15/40
摘要： The present invention directed to a method and apparatus for distinguishing between front facing and back facing polygons in a computer graphics environment. The method determines whether the polygon is a triangle, a quadrilateral, or a polygon with more than four vertices. Then the method computes the area of the polygon using a first formula, if the determining step determines the polygon to be a triangle. If the determining step determines the polygon to be a quadrilateral, then the method computes the area of the polygon using a second formula. Finally, if the determining step determines the polygon to be a polygon with more than four vertices, then the method computes the area of the polygon using a third formula. Each of the formulas—the first formula, the second formula, and the third formula—differ from one another. In the preferred embodiment, the apparatus is implemented in micro-code of a integrated circuit chip (although an alternative embodiment may be implemented in a software graphics pipeline). In this regard, a significant aspect of the present invention is that the calculation and evaluations of the present invention take place in/using homogeneous coordinates, and before clipping is performed.
摘要翻译：本发明涉及一种用于在计算机图形环境中区分正面和背面的多边形的方法和装置。该方法确定多边形是三角形，四边形还是多于四个顶点的多边形。然后，如果确定步骤将多边形确定为三角形，则该方法使用第一公式计算多边形的面积。如果确定步骤将多边形确定为四边形，则该方法使用第二公式计算多边形的面积。最后，如果确定步骤将多边形确定为具有多于四个顶点的多边形，则该方法使用第三公式计算多边形的面积。每个公式 - 第一个公式，第二个公式和第三个公式 - 彼此不同。在优选实施例中，该装置以集成电路芯片的微代码实现（尽管替代实施例可以在软件图形流水线中实现）。在这方面，本发明的重要方面是本发明的计算和评估发生在/使用均匀坐标，并且在进行削波之前。

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