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Re: 3D plot symbols
- Subject: Re: 3D plot symbols
- From: rkj(at)dukebar.crml.uab.edu (R. Kyle Justice)
- Date: 27 Jul 2000 15:03:51 GMT
- Newsgroups: comp.lang.idl-pvwave
- Organization: University of Alabama at Birmingham
- References: <8ln7vi$th2$1@SonOfMaze.dpo.uab.edu> <MPG.firstname.lastname@example.org>
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:20449
David Fanning (email@example.com) wrote:
: R. Kyle Justice (firstname.lastname@example.org) writes:
: > I would like to be able to create a 3-D scatter plot
: > with 3-D symbols. It would be nice if I could define
: > a cube with USERSYM. I can almost get what I want
: > using PLOTS but the symbols are "flat" in 3-D.
: I have a feeling the PLOTS symbols are "flat"
: because you forgot to set a T3D keyword on the
: PLOTS command. :-)
I am using the T3D keyword. The reason the symbols are
flat is because they have no depth. USERSYM only takes
x and y vertices. The plot is rendered properly, even
the symbols. They appear flat because they only have
1 side (actually 2, I guess; front and back).
: I can't see any reason why 3D symbols with PLOTS
: would be prohibited, even in PV-Wave, which I
: assume you are using.
Yep, I am primarily using PV-Wave but I don't really see
a way to get 3-D symbols in IDL either, at least not
with USERSYM. Is there a way to make 3-D symbols? This
would be a nice feature, especially since the 2-D symbols
appear to be rendered as if they are 3-D.
: > Can I get this functionality using the polygon
: > rendering routines? I am particularly worried about
: > speed since the plot will be animated (continuously
: > updated as symbol values change).
: I think speed will be a problem using PLOTS. I'd
: offer you something in the line of object graphics
: 3D scatterplots, but I doubt it would apply. :-(
It appears to be fast enough for my purposes with 2-D
symbols. If I have to use the polygon routines I'm
sure to get a big slowdown, even if I knew what I
was going (and I don't).
Why does the object graphics suggestion not surprise