<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=us-ascii" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.18812"><LINK rel=stylesheet
href="BLOCKQUOTE{margin-Top: 0px; margin-Bottom: 0px; margin-Left: 2em}"></HEAD>
<BODY style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt">
<DIV><FONT size=2 face=Verdana>I want to use vtk to model
3D building footprints,and do something raytracing staffs. Should
I calculate the buidling's relative position to raysource and somethings like
shallow calculating by myself? </FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV><FONT size=2 face=Verdana>Any hits? </FONT></DIV>
<DIV><FONT size=2 face=Verdana>Thanks!</FONT></DIV>
<DIV><FONT size=2 face=Verdana></FONT> </DIV>
<DIV align=left><FONT color=#c0c0c0 size=2 face=Verdana>2009-09-26
</FONT></DIV><FONT size=2 face=Verdana>
<HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2>
<DIV><FONT color=#c0c0c0 size=2 face=Verdana><SPAN>young_jh123</SPAN>
</FONT></DIV></FONT></BODY></HTML>