[osg-users] vpb on cluster example

Greg Myers aftacer at gmail.com
Mon Jul 28 11:49:29 PDT 2008


Hi JP,

I'm new and I'm a little fuzzy on the versioning between VPB and OSG.
It looks like for the example you have provided, we need an older
version (2.3.6) of OSG.  Do you know if there are plans to upgrade VPB
to work with the latest releases of OSG or am I totally missing
something?

Thanks for any info.
Greg



On Jul 23, 5:47 am, "J.P. Delport" <jpdelp... at csir.co.za> wrote:
> Hi,
>
>
>
> Robert Osfield wrote:
> > Hi J.P.
>
> > Many thanks for putting this guide, sure saves me some time and will
> > help others.
>
> > In terms of the work flow, there are couple of things that VPB can
> > help out with.
>
> > As you note, vpbmaster doesn't like, or actually does not permit
> > building on databases where the source data is in different
> > coordinates system, this is due to the fact that the parallel osgdem
> > runs would end up doing the reprojection themselves each time, which
> > is both a waste of compute resources as well as a threading issue.
> > Since vpbmaster has this requirement, we have a another tool that can
> > do the reprojection for use - vpbcache.
>
> > The vpbcache app can create a file cache that contains a mapping
> > between your original source data and reprojected versions of it.  The
> > vpbcache tool allows you to create this file cache, and then to do the
> > reprojection that is required for the final build.   vpbcache takes as
> > input a source file, typically exactly the same source file that
> > vpbmaster run will use.
>
> OK cool, I was wondering what the whole cache thing was about :)
>
>
>
>
>
> > So what's this about source files....  we'll this is an ascii file
> > that wraps up all the source data and build options that will use.
> > vpbmaster creates a source file and then passes this on to the slaves
> > so they no what to process. You can also get vpbmaster to generate a
> > master source file for you.
>
> > The rough process is :
>
> > Step 1:
>
> >    run vpbmaster with all your source files and then get it to output
> > a build.source file, this run does not run the
> >    actual build.  Add --so build.source to the command line to output
> > the source file.
>
> > Step 2:
>
> >    run vpbcache with the build.source file, to create a cache file
>
> > Step 3:
>
> >    run vpbcache to reproject the source files into the required
> > coordinates system for the build
>
> > Step 4:
>
> >    run vpbmaster with the cache file, and the build.source file, and a
> > master file describing the layout of
> >    your cluster
>
> > Step 5:
>
> >    Wait :-)
>
> I must say that the new vpb with --terrain is a _lot_ faster than the
> old osgdem used to be. One can now generate quite a bit of data over a
> weekend :)
>
> jp
>
>
>
> > I'm afraid I don't recall the options off the top of my head...
>
> > Robert.
> > _______________________________________________
> > osg-users mailing list
> > osg-us... at lists.openscenegraph.org
> >http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph...
>
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