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1. 发明授权

US5999187A Fly-through computer aided design method and apparatus 失效
标题翻译：飞行计算机辅助设计方法和设备
公开(公告)号：US5999187A
公开(公告)日：1999-12-07
申请号：US883781
申请日：1997-06-27
申请人： James Dehmlow , John Gass , Lynne M. Evans , Craig Daw
发明人： James Dehmlow , John Gass , Lynne M. Evans , Craig Daw
IPC分类号： G06T15/08 , G06T15/20 , G06T19/00 , G06F15/00
CPC分类号： G06T19/003 , G06T17/005 , G06T2200/16 , G06T2210/36
摘要： A fly-through, three-dimensional computer aided design system is provided. Computational requirements are bounded, at least in part by defining a bounded volume or world defining the volume which may be displayed, in whole or in part. Preprocessing the data assists in organizing the data for high performance display. Full detail rendering is available. However in some situations, such as during fly-through, some or all portions of the image are rendered in a simplified fashion, e.g. to maintain a high frame rate. The volume-based simplification involves rendering faces of cells or collections of cells which are at least partly intersected by components of the item or system being displayed. A plurality of granularities, preferably organized as an octree, provide multiple levels of detail. Unnecessary rendering load is reduced by view frustum culling and considering certain cell face occlusion situations. As the scene is rendered, preferably slicewise, the level of detail for slices can be adjusted based on predictions of time-to-complete, in order to meet a frame rate target.
摘要翻译：提供了一种贯穿式的三维计算机辅助设计系统。计算要求至关重要，至少部分地通过定义可以显示的整体或部分体积的有界体积或世界。预处理数据有助于组织高性能显示数据。提供全面的细节渲染。然而，在某些情况下，例如在通过期间，图像的一些或所有部分以简化的方式呈现，例如，保持较高的帧速率。基于卷的简化涉及渲染细胞的表面或至少部分地与被显示的物品或系统的部件相交的细胞集合。多个粒度，优选地被组织为八叉树，提供多级细节。通过观看截头锥体剔除并考虑某些细胞面部闭塞情况，减少不必要的渲染负荷。当渲染场景时，优选地切片，可以基于时间到完成的预测来调整切片的细节级别，以便满足帧速率目标。

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