| 3D Surface Problem [message #30142] |
Fri, 05 April 2002 15:16 |
Ken Mankoff
Messages: 158
Registered: February 2000
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Senior Member |
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Hi All,
I am using IDL Object Graphics to combine a Digital Elevation Model
(DEM) with a photograph in an attempt to get a pseudo-realistic 3D
view of a surface.
I have it mostly working, but have a shear effect that I cannot get
rid of... I do not fully understand this whole 3D viewpoint thingey.
Also, my images shapes vary. Sometimes they cover a 1x1 degree lat/lon
grid, other times its a 1x10 (it is not always two squares I am
putting together, although the DEM and the image are always the same
shape). Also, the DEM sometimes has a range of a few hundred meters,
and other times a few thousand meters...
To see what I am writing about specifically, please go here:
http://lasp.colorado.edu/mars/
and look at some 3D views (Viking, TES, or Geology)
* The "Olympus Mons" and "Valles Marineris" sites are decent.
* The bug is more obvious if you look at "Becquerel Crater"
* It is terrible if you look at "Viking 1", "Viking 2", or
"Chryse Planitia (South)"
Ideally, I would love a function to do this for me that is canned and
pre-written. (I will give the author credit on the site, if you are
interested in helping, let me know!). But I expect to have to code it
up myself. Can anyone see from these images what I am doing wrong? If
it will help if I give a code example, let me know and I will post
that...
Thanks,
Ken.
--
Kenneth Mankoff
LASP://303.492.3264
http://lasp.colorado.edu/~mankoff/
http://lasp.colorado.edu/snoe/
http://lasp.colorado.edu/mars/
http://lasp.colorado.edu/marsrobot/
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