公开(公告)号：US5329613A

公开(公告)日：1994-07-12

申请号：US58991

申请日：1993-05-06

申请人： Deborah D. Brase ,  Steven P. Larky ,  Joe C. St. Clair ,  Paolo Sidoli

发明人： Deborah D. Brase ,  Steven P. Larky ,  Joe C. St. Clair ,  Paolo Sidoli

IPC分类号： G06F3/153 ,  G06F3/033 ,  G06F3/048 ,  G06T1/60 ,  G06T11/80 ,  G06T15/30 ,  G09G5/36 ,  G06F15/62

CPC分类号： G06F3/04842 ,  G06T15/30

摘要： Apparatus and methods for picking three dimensional objects from images depicted on a video display. The displayed objects are selectively rerendered. During such rerendering the object pixels are compared in depth to the data in a Z buffer for determining visibility. The number and size of the objects subject to rerendering by the rasterization processor is constrained by using the front end graphics processor to define object extents and by rerendering only extents which have been clipped to the boundaries of the pick window. The rerendering operation does not alter the three dimensional graphics image stored in and repetitively scanned from the frame buffer. Selection between multiple objects within the pick window can include a weighted comparison using a pick plane memory to store visibility data by object.

摘要翻译： 用于从视频显示器上描绘的图像中拾取三维物体的装置和方法。 显示的对象被选择性地重新呈现。 在这种重新渲染期间，将目标像素与Z缓冲器中的数据进行深度比较以确定可视性。 通过使用前端图形处理器来定义对象范围并且仅重新渲染已经被剪辑到选择窗口的边界的范围，限制由光栅化处理器重新渲染的对象的数量和大小。 退回操作不会改变存储在帧缓冲器中并重复扫描的三维图形图像。 选择窗口内的多个对象之间的选择可以包括使用拾取平面存储器按对象存储可见性数据的加权比较。