<html><div style='background-color:'><DIV>I 've successfully created 3D
terrain by using Visad. Now, I want to draw a road on 3D terrain. The
road will be realized by drawing line between vector point.(Here, I'm
going to use Gridded3DSet) But the vector point information that I readed
from a special file(VMAP) only includes X and Y value, no Z value(elevation
value). How can I draw the road up and down along with the 3D terrain.(Not just
float on the 3D terrain) If I can get Z values from the 3D terrain according to
X,Y values, I may can draw a road as what I thought. But I have no idea about
how to retrive Z values from the 3D terrain.</DIV>
<DIV>If you can give me any suggestion, I will be very thankful.</DIV>
<DIV> </DIV>
<DIV>Jing</DIV>
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