Importance-Driven Volume Rendering(IDVR)是对直接体绘制算法的一个改进，里面集成了各种直接体绘制算法，MIP，two level，IDVR等。有源代码，说明文档，论文，测试数据，帮助文档等。对深入了解直接体绘制有很大帮助。-This　 report　 presents　 an　 effi cient　 implementation　 using

(Importance-Driven Volume Rendering- IDVR) to render all vol-

ume objects along the view direction in relation to the associated

object importance values. Due to the higher importance of specifi c

volume objects particular parts of objects with less importance will

be cut or suppressed in their transparency if they are in front of

more important object. Thus, the user is able to clearly view those

important but hidden objects, regardless which view direction has

been chosen.

IDVR actually is an addition to the common rendering pipeline

and　thus　can　be　effi ciently　combined　with　other　known　vol-

ume visualization methods,　in particular with realistic and non-

photorealistic shading methods.　Considering highly complex vol-

ume data sets containing various different volume objects, the IDVR

enhancement of our application will introduce an easy solution to

take care of entirely visu