| Re: isotropic keyword for surface? [message #72602] |
Thu, 23 September 2010 06:17 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
anand writes:
> I am using the SURFACE procedure to define the axes. I want to plot a
> unit sphere, and an array of data points. I am faced with two issues,
> which although are not stopping me from going ahead with my task, are
> important if I have to make the plot look neat.
>
> 1) Like the ISOTROPIC keyword for PLOT command, is there a
> corresponding command for SURFACE that would force equal scaling for
> all the 3 axes? This is really necessary, because otherwise the sphere
> of unit radius extends well beyond 1.0 along at least 2 axes at a
> time. More importantly, is it just an issue with the scaling, or am I
> missing something here.
I think what you are probably missing is that in
direct graphics you are dealing with a 2.5D
system, not a true 3D system. In other words,
the deck has been stacked completely against
you.
To do this correctly, you probably want to work
in the object graphics system, which is a true
3D system.
I don't have time to put an example together this
morning, but if I were going to do it, I would use
simple_surface and the orb object that you can
find somewhere in the IDL distribution (orb__define.pro)
to do it.
http://www.dfanning.com/simple_surface.pro
It will be very easy to create a unit cube data
space in object graphics.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
