<div dir="ltr"><div><span class="" style="float:left;margin:0px;padding:0px;max-height:40px;overflow:hidden"><a href="https://groups.google.com/forum/#!searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ"><font color="#50799b" face="Microsoft YaHei"><span style="font-size:12px;line-height:19.2px">primitive problem</span></font><br></a></span><span class="" style="float:left;margin:0px;padding:0px;max-height:40px;overflow:hidden"><a href="https://groups.google.com/forum/#!searchin/osg-users/how$20to$20draw$20a$20Curved$20Surface$20on$20the$20top$20of$20terrain$3F/osg-users/q0fcYqNZ84E/LqfRH3rBrTUJ"><br><br></a></span></div><div><br></div><span style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;line-height:18px;background-color:rgb(239,239,239)"><div><span style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;line-height:18px;background-color:rgb(239,239,239)"><br></span></div>1、how to draw a Curved Surface on the top of terrain? like the fig. </span><br style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;line-height:18px;background-color:rgb(239,239,239)"><span style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;line-height:18px;background-color:rgb(239,239,239)">2、how to compute the surface area of the Curved Surface? </span><br><div><span style="color:rgb(0,0,0);font-family:Verdana,Arial,Helvetica,sans-serif;font-size:12px;line-height:18px;background-color:rgb(239,239,239)"><img src="cid:ii_15119eaa13ffd189" alt="内嵌图片 1" width="196" height="187"><br></span></div><div><span style="background-color:rgb(239,239,239)"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:12px;line-height:18px">I  want to use  polytope intersector, but I don't have  inspiration. So can you give me some advise?</span></font></span></div><div><span style="background-color:rgb(239,239,239)"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:12px;line-height:18px">thank you a lot.</span></font></span></div></div>