| Re: plotting particle data with halos? [message #33699] |
Thu, 16 January 2003 20:20  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Matt Wood <wood@astro.nospam.fit.edu> writes:
> I've got particle data generated from 'smoothed particle hydrodynamics'
> code that I'd like to visualize using idl. Are there any routines that
> will plot particles with 'halos' instead of simple colored points? If
> you'd like to see an example of what we're doing, please see
> www.astro.fit.edu/wood/100k34.gif
> It's a simulation of an interacting binary star system that has an
> accretion disk. Color indicates temperature in the disk.
The easiest thing to do might be to plot to the Z buffer, capture it,
then convolve with a gaussian, or even simpler, just SMOOTH it. That
will give a more smooth look, but of course every point will have the
same "halo" size.
However, if you really need variable size smooth particles, then you
need to kick it up a notch. You could compute a 2D gaussian for each
point, add them to an IDL array one at a time, but that might get
pretty computationally expensive. Better might be to make up a
library of 2D gaussians and then add those in turn, picking the
closest one.
A trick combination of the 1st (convolution) and 2nd (addition of
gaussians) approaches would be to sort the points according to their
particle size, partition them into a few groups, make
plots+convolutions of each using the right particle size, then add
them up.
Cool sims! I work on X-ray binaries.
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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