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Re: Question about road display

<html><div style='background-color:'><DIV>
<P>Hi Bill,</P>
<P>Thank you for your soon reply.&nbsp; I just wonder if there is another way I 
can draw the road.</P>
<P>For example:</P>
<P>I draw the road (2D line) on X-Y plane and then project it to the 3D 
terrain. </P>
<P>Jing<BR><BR></P></DIV>
<DIV></DIV>
<DIV></DIV>&gt;From: Bill Hibbard <BILLH@xxxxxxxxxxxxx>
<DIV></DIV>&gt;To: Jing Zhang <GOLDLION888@xxxxxxxxxxx>
<DIV></DIV>&gt;CC: visad-list@xxxxxxxxxxxxx 
<DIV></DIV>&gt;Subject: Re: Question about road display 
<DIV></DIV>&gt;Date: Sun, 12 Jan 2003 20:36:30 -0600 (CST) 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;Hi Jing, 
<DIV></DIV>&gt; 
<DIV></DIV>&gt; &gt; I 've successfully created 3D terrain by using Visad. Now, 
I want to draw 
<DIV></DIV>&gt; &gt; a road on 3D terrain. The road will be realized by drawing 
line between 
<DIV></DIV>&gt; &gt; vector point.(Here, I'm going to use Gridded3DSet) But the 
vector point 
<DIV></DIV>&gt; &gt; information that I readed from a special file(VMAP) only 
includes X and Y 
<DIV></DIV>&gt; &gt; value, no Z value(elevation value). How can I draw the 
road up and down 
<DIV></DIV>&gt; &gt; along with the 3D terrain.(Not just float on the 3D 
terrain) If I can get 
<DIV></DIV>&gt; &gt; Z values from the 3D terrain according to X,Y values, I 
may can draw a 
<DIV></DIV>&gt; &gt; road as what I thought. But I have no idea about how to 
retrive Z values 
<DIV></DIV>&gt; &gt; from the 3D terrain. 
<DIV></DIV>&gt; &gt; If you can give me any suggestion, I will be very 
thankful. 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;If you have an (x, y) value in a RealTuple, and your terrain 
<DIV></DIV>&gt;in a FlatField with MathType ((x, y) -&gt; z), then you can get 
<DIV></DIV>&gt;the z value by passing the RealTuple to the evaluate(RealTuple) 
<DIV></DIV>&gt;method of the FlatField. 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;Good luck, 
<DIV></DIV>&gt;Bill 
<DIV></DIV></div><br clear=all><hr>Help STOP SPAM: Try the new MSN 8 and <a 
href="http://g.msn.com/8HMHEN/2023";>get 2 months FREE*</a> </html>
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