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1. 发明申请

WO1993023835A1 TEXTURED SPHERE AND SPHERICAL ENVIRONMENT MAP RENDERING USING TEXTURE MAP DOUBLE INDIRECTION 审中-公开
标题翻译：纹理球形和球形环境使用纹理映射双重区分渲染
公开(公告)号：WO1993023835A1
公开(公告)日：1993-11-25
申请号：PCT/US1993002678
申请日：1993-03-23
申请人： APPLE COMPUTER, INC.
发明人： APPLE COMPUTER, INC. , MILLER, Gavin, S., P. , CHEN, Shenchang, Eric
IPC分类号： G09B09/08
CPC分类号： G09B29/005 , G06T15/04 , G09B9/301
摘要： A system for rendering textured spheres and spherical environment maps provides for real time rotation of a textured sphere (501) and panning of the view into a spherical environment map (407), along multiple axes (502) without the need for special rendering hardware. The method is comprised of the steps of: providing a parmetric spherical environment map (501) of the image to be viewed, generating a screen look-up table (404) comprised of look-up addresses, generating a parametric look-up table (408) comprised of index values into the parametric spherical environment map, and for each look-up address (405) in the screen look-up table (404), mapping to an entry in the parametric look-up table (408), retrieving the value in the entry, and using the value to retrieve pixel values (411) from the parametric spherical environment map. Rotation or movement of the view being seen is accomplished by adding offsets to the look-up address and/or the index values.
摘要翻译：用于渲染纹理球体和球面环境图的系统提供纹理球体（501）的实时旋转，并且沿着多个轴（502）将视图平移到球面环境图（407）中，而不需要特殊的渲染硬件。该方法包括以下步骤：提供要观看的图像的对称球面环境图（501），生成包括查找地址的屏幕查找表（404），生成参数查找表（ 408）包括索引值到参数化球面环境图中，并且对于屏幕查找表（404）中的每个查找地址（405），映射到参数查找表（408）中的条目，检索条目中的值，并使用该值从参数化球面环境图中检索像素值（411）。所查看的视图的旋转或移动是通过向查找地址和/或索引值添加偏移来实现的。

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