Re: [Algorithms] PVA hierarchies (was: Terrain performance etc)

[Mark D. <duc...@ll...>]

Hi Jonathan,

The dataset I mention is available to the public, in the sense
that it has been approved for release.  It is too big to
put on the little servers we have accessible to the public, however,
at least for all the timesteps (total data is 274*2048*2048*1920
bytes, i.e. 2.4 terabytes).  A single timestep gzips
down to about 2 gig.  I'll see if I can get that on
our web site.  I can ftp to whoever asks, but I can't
handle a lot of requests by hand like that.  If someone
has a lot of server disk space and is willing to host
the dataset, that might be a good solution.  The company
hosting my cognigraph.com site has severe limits on the
disk space (I may put up my own server eventually to
overcome this).  The easiest thing to hand out (size-wise)
is the raw brick of field data and some code to
extract an isocontour surface.  The surfaces end up bigger
that the original brick data!  Beware that you end up with
about half a billion triangles for a single isocontour
at the final timestep.  All our code works in chunks,
never on the whole dataset at once in memory.

Here is some info on the dataset:

 snapshot at late time, volume rendered:
   http://www.llnl.gov/CASC/asciturb/pubs/html-ppt-134237/sld012.htm

 slides on the science and the computational effort:
   http://www.llnl.gov/CASC/asciturb/pubs/html-ppt-134237/sld043.htm

Cheers,

--Mark

Jonathan Blow wrote:
> 
> Mark Duchaineau wrote:
> 
> > For a huge computational
> > fluid dynamics isosurface representing the mixing boundary
> > of two gases undergoing violent (explosion-induced)
> > turbulence, i.e. a REALLY nasty surface, I am getting
> > a solid 100M tri/sec with essentially no CPU work
> > per frame (from the app anyway -- I can't speak for
> > the drivers).  This surface has depth complexity 50
> > on average, so I really need to minimize the window size
> > to get this performance (we haven't gotten the
> > occlusion culling for this finished yet -- that's
> > another big project!).
> 
> That sounds really cool, actually.  Are you able to share this
> data set?  I'd like to do some experiments with something
> like that.
> 
>    -Jonathan.
> 
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