Re: NEC-LIST: Field animations

I wasn't proposing using POVray to do any calculations, but using POVray to
render the field data generated by NEC, say by representing the field as
small arrows at each grid point, or colored blobs, or (I'm not sure POVray
does this well..)filling each grid point as a cubical transparent voxel, or
a stack of planes colored according to field strength, etc. You'd need a
translation layer to turn NEC output into POVray input...and the files would
be huge...

Taking the arrow example, you could specify the direction and the length of
the arrrow to be calculated as, e.g. Poynting vectors or rotating phasors,
where the coordinates/length/characteristics vary as a function of animation
time. Matlab has functions that do this kind of thing automatically in
their 3D visualization stuff

A few days back there were some references to some visualization papers on
the list, and one of those papers had some URLs which have nice 2D
animations of fields (at UC Davis, among other places)

----- Original Message -----
From: "Michael Pender" <michael.pender_at_nanochron.com>
To: "Jim Lux" <James.P.Lux_at_jpl.nasa.gov>; "David Jefferies"
<d.jefferies_at_surrey.ac.uk>
Cc: <nec-list_at_gweep.ca>
Sent: Thursday, January 16, 2003 9:39 PM
Subject: Re: NEC-LIST: Field animations

> I don't think POVray will work the way you intend because of the way
POVray
> uses an amplitude-based ray-tracing model. I've actually been researching
> this very question for a few years ago and have been developing a more
> elegant solution.
>
> However, I think we should have that conversation off-line. Feel free to
> e-mail me directly
>
> - Mike
> michael.pender_at_nanochron.com
>
> ----- Original Message -----
> From: Jim Lux <James.P.Lux_at_jpl.nasa.gov>
> To: David Jefferies <d.jefferies_at_surrey.ac.uk>
> Cc: nec-list <nec-list_at_gweep.ca>
> Sent: Tuesday, January 14, 2003 10:33 PM
> Subject: Re: NEC-LIST: Field animations
>
>
> > Could one do this in two steps? NEC to calculate near field (including
> > phase) and then something like POVray to step through the phases
> generating
> > an animation. Arie's 4nec2 can generate POVray files (at least for
> geometry
> > and far field.. I haven't tried for near field distributions)...
> presumably,
> > you'd have to specify some "cut" through the field, and then it would be
a
> > fairly straightforward thing to integrate the phase/time stepping with
> > POVray's animation features
> >
> > NEC couldn't directly do phenomena that last more than one cycle (like
two
> > coupled resonators, for instance), because I think the basic assumption
> > behind MoM codes is steady state (i.e. it's at one frequency). Could
one,
> > though, run two (or more) NEC sims at different (or multiple)
frequencies
> > and then synthesize the coupled stuff with a simple linear combination
> > (after all, POVray can do the arithmetic)? The systems are linear, and
> > superposition holds....
> >
> > ----- Original Message -----
> > From: "David Jefferies" <d.jefferies_at_surrey.ac.uk>
> > To: <nec-list_at_gweep.ca>
> > Sent: Tuesday, January 14, 2003 6:50 PM
> > Subject: NEC-LIST: Field animations
> >
> >
> > > Dear List,
> > >
> > > I wondered if any of the flavours of NEC can be made
> > > to produce an animation (over a cycle) of the near fields and the
> > > near-far field transition region for (say) differently
> > > coloured E and H field components? Or perhaps one would
> > > need an FDTD method to do this? Apologies if this has
> > > come up in the NEC list archives somewhere.
> > >
> > > Regards
> > >
> > > --
> > > David Jefferies
> > > http://www.ee.surrey.ac.uk/Personal/D.Jefferies/
> > > http://www.eryptick.net/
> > > fax +44 (0)1483 534139 attn D.Jefferies
> > > --
> > > The NEC-List mailing list <nec-list_at_gweep.ca>
> > > http://www.gweep.ca/mailman/listinfo.cgi/nec-list
> > --
> > The NEC-List mailing list <nec-list_at_gweep.ca>
> > http://www.gweep.ca/mailman/listinfo.cgi/nec-list
> >
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list

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