基于对象缓冲区的拾取法在地质体可视化中的应用  

Application of Object Buffer Pick-up Algorithm in 3D Geology Volume Visualization

作　　者：王雪莉[1] 唐志辉[1] 

机构地区：[1]中国石油大学(华东),青岛266580

出　　处：《科学技术与工程》2012年第20期5066-5068,5075,共4页Science Technology and Engineering

摘　　要：在三维地质体可视化中,需要操作者能够通过输入设备如鼠标来操纵屏幕上的物体,有时还需要获取物体的空间坐标或图形数值,这些都需要以拾取作为实现的基础。运用基于对象缓冲区的拾取方法。当用户要拾取一个物体时,在对象缓冲区中重画整个画面,把每个对象的标识符进行编码作为颜色值,然后,应用程序根据该像素的颜色值得到所要拾取对象的索引编码。通过得到的编码值能够快速、准确地搜索到所要拾取的对象,实现了在三维地质体中选择拾取有效地层的功能,避免了空间求交的复杂运算,速度快,并通过对象索引实现拾取被遮挡地层,在三维地质体可视化系统中获得了良好的应用效果。In 3D geology volume visualization system, need control the objects on screen with input device , sometimes need capture the space coordinates or value of the figure , all of these operation need to pick-up as the basis for realization. The Method of Pick Object Based on Object-Buffer was used in this system, which allowed us- ers to select the effective targets quickly and exactly. While picking-up, redraw the whole image of object buffer, take the code of the object as the pixel＇ s color value through which the program can earn the index code of the ob- ject and find the target object. This system can void the complex operation of seeking intersection points in the space, and seek the final stratum , have a good application effect.

关 键 词：拾取 对象缓冲区 地质体可视化 

分 类 号：TP333.8[自动化与计算机技术—计算机系统结构]