公开(公告)号：EP0480570A3

公开(公告)日：1992-11-19

申请号：EP91307723.6

申请日：1991-08-22

申请人： International Business Machines Corporation

发明人： Brase, Deborah Diane ,  Larky, Steven Philip ,  St. Clair, Joe Christopher ,  Sidoli, Paolo

IPC分类号： G06F15/72 ,  G06F3/033

CPC分类号： G06F3/04842 ,  G06T15/30

摘要： In a system and process 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 9 for determining visibility. The number and size of the objects subject to rerendering by the rasterization processor 2 is constrained by using the front end graphics processor 1 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 3. Selection between multiple objects within the pick window can include a weighted comparison using a pick plane memory 20 to store visibility data by object.

摘要翻译： 在用于从视频显示器上描绘的图像中拾取三维物体的系统和过程中，选择性地重新显示所显示的对象。 在这种重新渲染期间，将目标像素深度地与Z缓冲器9中的数据进行比较，以确定可视性。 通过使用前端图形处理器1来定义对象范围并且仅重写已经被裁剪到拾取窗口的边界的范围来限制由光栅化处理器2重新渲染的对象的数量和大小。 重写操作不会改变存储在帧缓冲器3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20的加权比较，以按对象存储可视数据。

公开(公告)号：EP0480570A2

公开(公告)日：1992-04-15

申请号：EP91307723.6

申请日：1991-08-22

申请人： International Business Machines Corporation

发明人： Brase, Deborah Diane ,  Larky, Steven Philip ,  St. Clair, Joe Christopher ,  Sidoli, Paolo

IPC分类号： G06F15/72 ,  G06F3/033

CPC分类号： G06F3/04842 ,  G06T15/30

摘要： In a system and process 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 9 for determining visibility. The number and size of the objects subject to rerendering by the rasterization processor 2 is constrained by using the front end graphics processor 1 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 3. Selection between multiple objects within the pick window can include a weighted comparison using a pick plane memory 20 to store visibility data by object.

摘要翻译： 在用于从视频显示器上描绘的图像中拾取三维物体的系统和过程中，选择性地重新显示所显示的对象。 在这种重新渲染期间，将目标像素深度地与Z缓冲器9中的数据进行比较，以确定可视性。 通过使用前端图形处理器1来定义对象范围并且仅重写已经被裁剪到拾取窗口的边界的范围来限制由光栅化处理器2重新渲染的对象的数量和大小。 重写操作不会改变存储在帧缓冲器3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20的加权比较，以按对象存储可视数据。