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2. 发明授权

US6028607A Method of producing a sequence of triangles from a vertex raster with and without half resolution edges while decompressing a compressed geometry stream 失效
标题翻译：从具有和不具有半分辨率边缘的顶点栅格生成三角形序列的方法，同时解压缩压缩的几何流
公开(公告)号：US6028607A
公开(公告)日：2000-02-22
申请号：US7525
申请日：1998-01-15
申请人： Jeffrey M. Chan
发明人： Jeffrey M. Chan
IPC分类号： G06T17/20
CPC分类号： G06T17/20
摘要： A method of producing a sequence of triangles from a compressed geometry stream that includes an array of vertices includes steps of parsing vertices and pushing the parsed vertices into a buffer until the last vertex of the current row of the array is parsed and pushed. The first vertex of the current row is then re-used from the buffer and drawn. The first vertex of the next row is then parsed from the geometry stream, pushed into the buffer and drawn. Thereafter, it is determined whether a quad split bit is asserted. If the quad split bit is not asserted, the next vertex from the current row is parsed, pushed into the buffer, and drawn. The next vertex of the previous row is then re-used from the buffer and the re-used next vertex is drawn. If the quad split bit is asserted, the next vertex of the previous row is re-used from the buffer and drawn. The next vertex from the current row is then parsed and pushed into the buffer. Thereafter, the method returns to the determining step until the last vertex of the current row is reached, and returns to the first vertex re-using step until the last vertex of the array is reached. A triangle is formed from each three consecutive drawn vertices, to thereby create the sequence of triangles, starting from the beginning of each row. The raster may include one or more half-resolution edges, wherein alternate vertices are dropped and not drawn.
摘要翻译：从包括顶点阵列的压缩几何流中产生三角形序列的方法包括解析顶点并将解析的顶点推入缓冲器的步骤，直到解析并推送阵列的当前行的最后一个顶点。然后从缓冲区重新使用当前行的第一个顶点并绘制。然后从几何流中解析下一行的第一个顶点，将其推入缓冲区并绘制。此后，确定是否断言四分割位。如果四分割位未被置位，则将解析来自当前行的下一个顶点，并将其推入缓冲区并绘制。然后从缓冲区重新使用上一行的下一个顶点，并绘制重新使用的下一个顶点。如果四分割位被断言，则前一行的下一个顶点从缓冲区重新使用并绘制。然后从当前行的下一个顶点解析并将其推入缓冲区。此后，该方法返回到确定步骤，直到达到当前行的最后一个顶点，并返回到第一个顶点重新使用步骤，直到达到阵列的最后一个顶点。从每三个连续绘制的顶点形成一个三角形，从而从每行开始创建三角形序列。光栅可以包括一个或多个半分辨率边缘，其中替代顶点被丢弃并没有画出。

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