Series of unconnected triangles
Matthew Turk
I have a set of triangles, divvied up into groups of three vertices
each, that I'd like to plot. It seems the 'mesh' command in partiview
is the way to do this, but what I'm running into is that I'd like the
final vertex not to be connected to the subsequent vertex. Is there a
'skip' command or other way to suppress this connection? Or should I
be creating lots of 4-vertex meshes, with first&final repeated?
Thanks very much,
Matt
Stuart Levy
Given partiview's current capabilities, rather than a "mesh", it'd be best
to use a "waveobj", wavefront-format object (though it should also work to
make a pile of degenerate meshes as you describe).
You'd gather up all the vertices of all the triangles into one big list,
then add a list of faces which refer to triples of vertices. Put this
in a separate file, maybe "triangles.obj", and then use
waveobj [-c <colorindex>] [-tx <textureindex>] triangles.obj
where triangles.obj might contain something like (written as plain text,
one vertex or face per line):
v x1 y1 z1 # position of vert. 1 (note that vert. indexing is 1-based)
v x2 y2 z2 # position of vert. 2
v x3 y3 z3 # position of vert. 3, etc.
v x4 y4 z4 # ...
f 1 2 3 # one triangle
f 4 5 6 # another
# ...
(You can also apply per-vertex face normals and texture coordinates as
usual in the Wavefront format. There's no support for .mtl materials though.
Use waveobj -tx <textureno> or -c <colorindex> to specify a color or texture
to apply to all the triangles. Details of "waveobj" are in the reference doc,
as in .../partiview/doc/partiview-4.html.)
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Matthew Turk
Thank you! That worked perfectly. I really appreciate it.
Best,
Matt