Re: octave and 3-D shapes/meshes

[Etienne Grossmann]

  Hi Jeff,


I'm afraid I can't look into it right now: writing from a windows
machine (no X), connected through a ~ 300 baud connection for 12 users
:-(. At 1st sight, your code is ok, so it could be a prob in freewrl.
Does test_vrml_faces() display anything?  Sorry for giving hope w/out
effective support. I'll be back on Sunday.

  Etienne

On Tue, Oct 18, 2005 at 03:53:03PM -0400, Jeff Abrahamson wrote:
# On Tue, Oct 18, 2005 at 01:42:24AM -0400, Etienne Grossmann wrote:
# >   Hi Jeff,
# > 
# > maybe, in this case, vrml is apropriate: source forge has
# > vrml_faces, vrml_surf, vrml_browse and vmesh functions. I think the
# > 1st will do what you want. If you have freewrl installed, you can use
# > vrml_browse to visualise your vrml object and take snapshots w the s
# > key. 
# 
# That looks very cool, thanks.  I compiled it (I miss autoconf).  I
# already got to submit a bug report, as it crashed on several of the
# test shapes. :(
# 
# But sometimes it works, so I made myself a triangulated cube and
# called vrml_faces and got the following bit of vrml, which I passed to
# vrml_browse.  FreeWRL came up and showed a black screen (plus status
# text).  Am I doing something wrong?
# 
#   octave:5> vrml
#   vrml = Shape {
#     appearance Appearance {
#             material  Material {
#               diffuseColor       0.3      0.4      0.9
#           }
#     }
#     geometry IndexedFaceSet {
#       solid FALSE     # Show back of faces too
#       convex FALSE
#       coordIndex [
#   0, 1, 3, -1, 0, 3, 2, -1, 2, 3, 5, -1, 2, 5, 4, -1, 4, 5, 7, -1, 4, 7, 6, 
-1, 6, 7, 1, -1, 6, 1, 0, -1, 1, 7, 5, -1, 1, 5, 3, -1, 6, 0, 2, -1, 6, 2, 4, 
-1, ]
#       coord  Coordinate {
#       point [
#                    -0.500   -0.500    0.500,
#                     0.500   -0.500    0.500,
#                    -0.500    0.500    0.500,
#                     0.500    0.500    0.500,
#                    -0.500    0.500   -0.500,
#                     0.500    0.500   -0.500,
#                    -0.500   -0.500   -0.500,
#                     0.500   -0.500   -0.500,
#   ]
#       }
#     }
#   }
# 
#   octave:6>
# 
# 
# BTW, this is how I called vrml_faces:
# 
#   octave:6> cube
#   cube =
#   {
#     faces =
# 
#       1  1  3  3  5  5  7  7  2  2  7  7
#       2  4  4  6  6  8  8  2  8  6  1  3
#       4  3  6  5  8  7  2  1  6  4  3  5
# 
#     triangle_areas =
# 
#      Columns 1 through 8:
# 
#       0.50000  0.50000  0.50000  0.50000  0.50000  0.50000  0.50000  0.50000
# 
#      Columns 9 through 12:
# 
#       0.50000  0.50000  0.50000  0.50000
# 
#     verts =
# 
#      Columns 1 through 7:
# 
#       -0.50000   0.50000  -0.50000   0.50000  -0.50000   0.50000  -0.50000
#       -0.50000  -0.50000   0.50000   0.50000   0.50000   0.50000  -0.50000
#        0.50000   0.50000   0.50000   0.50000  -0.50000  -0.50000  -0.50000
# 
#      Column 8:
# 
#        0.50000
#       -0.50000
#       -0.50000
# 
#   }
# 
#   octave:7> vrml = vrml_faces(cube.verts, cube.faces)
# 
# -- 
#  Jeff
# 
#  Jeff Abrahamson  <http://www.purple.com/jeff/>    +1 215/837-2287
#  GPG fingerprint: 1A1A BA95 D082 A558 A276  63C6 16BF 8C4C 0D1D AE4B
# 
# 
# 
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-- 
Etienne Grossmann ------ http://www.cs.uky.edu/~etienne



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