| 3D plot symbols [message #20780] |
Wed, 26 July 2000 00:00  |
rkj
Messages: 66
Registered: February 1996
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Member |
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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.
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).
Thanks.
Kyle
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| Re: 3D plot symbols [message #20866 is a reply to message #20780] |
Thu, 27 July 2000 00:00  |
rkj
Messages: 66
Registered: February 1996
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Member |
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David Fanning (davidf@dfanning.com) wrote:
: R. Kyle Justice (rkj@dukebar.crml.uab.edu) 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
me ;-)
: Cheers,
: David
Kyle
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| Re: 3D Plot [message #23712 is a reply to message #20780] |
Thu, 08 February 2001 13:24 |
btt
Messages: 345
Registered: December 2000
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Senior Member |
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Hi,
You might try http://www.dfanning.com/tips/scatter3d.html. On that page,
David describes how to accomplish just what you want using direct graphics.
I think he has a routine called FSC_Scatter that does the same but in object
graphics. Object graphics really shine in the 3d realm.
Ben
Mike Garrett wrote:
> Hey all,
>
> I have been trying to create a 3D plot. I have a two dimensional array
> that holds the z values. I just want to plot a point at that point in 3D
> space, so if I have data(1,2) = 3 then i want to put a point at x = 1, y
> =2 and z = 3. However, with the surface command a line is always drawn to
> connect this point with other points. Is there another command I am not
> familiar with or any other ideas?
>
> Thanks
>
> Mike
--
Ben Tupper
Bigelow Laboratory for Ocean Sciences
180 McKown Point Rd.
W. Boothbay Harbor, ME 04575
btupper@bigelow.org
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