Re: a curve on a surface ?
- From: "Theo Hopman" <hopman.theo@xxxxxxxxx>
- Date: 28 Jul 2006 07:11:17 -0700
Olivier wrote:
Dear all,
I simply want a curve ( cos(u),sin(u),u )
on a cylinder ( cos(u),sin(u),v ). But with
hidden contours :-(
The problem I meet : some of the segments
that represent the curve are under/over part of the
tiles that represent the surface, though in real
life they are on it.
Please always give a (small) example of what you're trying to do. It's
easier to debug code than descriptions. What's wrong with
set parametric
set urange [0:pi]
set hidden3d
set isosamples 25,25
splot cos(u),sin(u),v, cos(u),sin(u),u
[...]
PS: working with linux and gtk usually
if you know of a graphical interface,
I would be happy (xgfe seems to ask for Qt :-()
You're probably best off to get used to the command line interface. The
graphical user interfaces tend to lag behind in support of useful
gnuplot features, and are often poorly supported themselves (e.g.
disappearing home pages).
But I would like to do several things:
-- cut the cylinder along a line and
unfold / flatten the resulting sheet of paper
(in two / three steps)
I'm not completely sure what you mean here, but wouldn't this just be a
plot of z versus phi?
-- an oblilque plane is cutting this cylinder.
I would love the orthonormal projection
on this plane. I should be able to do it with
some contour stuff but I'm rather stuck ...
gnuplot's not a three dimensional geometry package, it's a plotting
package. You'll have to do the math either yourself or in another
program.
THeo
.
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