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1. 发明授权

US06690369B1 Hardware-accelerated photoreal rendering 失效
标题翻译：硬件加速的真实渲染
公开(公告)号：US06690369B1
公开(公告)日：2004-02-10
申请号：US08904715
申请日：1997-08-01
申请人： George Randolph Smith, Jr. , Karin P. Smith , David John Stradley
发明人： George Randolph Smith, Jr. , Karin P. Smith , David John Stradley
IPC分类号： G06T1500
CPC分类号： G06T15/10
摘要： A multiple-pass system for determining the primitives that are visible in a predetermined pick aperture for a “visible pick” operation. On the first pass, the primitives contained within the pick aperture and thus potentially visible are selected, and each selected primitive is assigned a pick index as an identifier. On the second pass, the pick indices of the selected primitives are rendered to a temporary frame buffer area, using a Z-buffer for hidden surface removal so that only the pick indices of the primitives visible within the pick aperture are stored in the corresponding frame buffer portion. On the third pass, the frame buffer portion corresponding to the pick aperture is read to determine the pick indices of the visible primitives. This information is then used to report back to the host the picked primitives.
摘要翻译：用于确定在“可见拾取”操作的预定拾取孔中可见的图元的多通道系统。在第一次通过中，选择包含在拾取孔径内并因此潜在可见的图元，并且将每个选择的图元分配为拾取索引作为标识符。在第二次通过中，使用Z缓冲器将选择的原语的选择索引渲染到临时帧缓冲区，以便隐藏表面去除，使得仅在拾取孔中可见的图元的拾取索引被存储在相应的帧中缓冲部分。在第三遍中，读取与拾取孔对应的帧缓冲器部分，以确定可见图元的拾取索引。然后，该信息用于向主机报告所选的基元。

2. 发明授权

US5835095A Visible line processor 失效
标题翻译：可视线处理器
公开(公告)号：US5835095A
公开(公告)日：1998-11-10
申请号：US438048
申请日：1995-05-08
申请人： Karin P. Smith , George R. Smith, Jr.
发明人： Karin P. Smith , George R. Smith, Jr.
IPC分类号： G06T15/40
CPC分类号： G06T15/405
摘要： Objects are represented in a coordinate space which is twice scanned by scan lines, once in one direction and then once in another direction. At each scan line, a list of line segments is generated, where each line segment represents the intersection of the projection of a polygon and the scan line. The segments are then examined to determine which are visible segments, using the z values of the end points of the segments. The visible segments of a scan line are compared to the visible segments of a previous scan line or an accumulation of visible lines, and if the end points of a visible segment taken from a polygon differ by less than a threshold amount, the lines formed between end points in one scan line and the adjacent scan line are considered to be visible lines. Where the two scans are a horizontal scan and a vertical scan, the threshold amount for vertical scans is the distance between horizontal scans and the threshold amount for horizontal scans is the distance between vertical scans.
摘要翻译：对象在坐标空间中被表示，该坐标空间被扫描线扫描两次，一次在一个方向上，然后在另一个方向上扫描一次。在每个扫描线上，生成线段列表，其中每个线段表示多边形的投影与扫描线的交点。然后检查段以确定哪些是可见段，使用段的端点的z值。将扫描线的可见段与先前的扫描线的可见段或可见线的累积进行比较，并且如果从多边形获取的可见段的端点相差小于阈值量，则在一条扫描线和相邻扫描线的端点被认为是可见线。在两次扫描是水平扫描和垂直扫描的情况下，垂直扫描的阈值量是水平扫描之间的距离，水平扫描的阈值量是垂直扫描之间的距离。

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