[osg-users] vpb on cluster example

[Greg Myers]

Hey JP,

First of all I want you to know that I really appreciate your help. :)

I tried the BMNG image that covers my area of interest and that worked
like a charm.  No more black areas.

Now, I only ran the data using a level setting of 10.  When I zoom in
on the high res image that I provided, it is not high res at all.
Does the level setting need to be cranked way up in order to be able
to see the details in the high res image?  Do I need to specify layer
options for my high res image like you did in your example?

And one more question, what is the purpose of the archive file output
type ( the -a option ) ?

Thanks
Greg

On Jul 30, 3:33 am, "J.P. Delport" <jpdelp... at csir.co.za> wrote:
> Hi,
>
> sorry, I can only guess at potential problems...
>
> I am assuming you are viewing the data with osgviewer so that I can
> discard other cases where blending might not be set up correctly.
>
> The black portions normally indicate that something is up with the
> blending of data. E.g. sometimes the geotiffs have transparent areas
> that have to be blended with other tiles. This occurs e.g. when the
> tiles are not square. Since the dted data has no colour data, I'm not
> sure what the image data will blend with.
>
> What I would try is to use one of the BMNG tiles as a backdrop. See on
> the wiki for a link. The BMNG tile covers a wide area and would be used
> for places in the terrain where you do not supply your own higher res
> image data.
>
> jp
>
>
>
> GregMyerswrote:
> > I have another question for you JP.  I have been playing with the osgdem
> > tool and trying to create a terrain database with some aerial photos (
> > geotiffs ).  After my database is generated using the command:
>
> > Osgdem --geocentric --terrain -d DTED -t image.tif -l 4 -o test\test.ive
>
> > I get something that looks about right except that the terrain around the
> > image is blacked out.  More area is blacked out when I'm viewing the higher
> > layers.  I'm attaching a small image so that you can see what I'm talking
> > about.  If you look near the top left corner of the black area you can
> > barely make out my tiny little geotiff image.  When I zoom out the black
> > area becomes larger.  When I zoom in it becomes smaller but never goes
> > completely away.  It seems that whichever tile ( I think that's the right
> > term ) the image is located in is blacked out everywhere except where the
> > image is.  Is it not possible to use images that only cover a portion of
> > your terrain or am I just missing some command line arguments or something?
>
> > Thanks
> > Greg
>
> > -----Original Message-----
> > From: osg-users-boun... at lists.openscenegraph.org
> > [mailto:osg-users-boun... at lists.openscenegraph.org] On Behalf Of J.P.
> > Delport
> > Sent: Monday, July 28, 2008 11:49 PM
> > To: OpenSceneGraph Users
> > Subject: Re: [osg-users] vpb on cluster example
>
> > Hi,
>
> > GregMyerswrote:
> >> 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
>
> > sorry, I should have made the versions I used more explicit. For the
> > example I used OSG and VPB from svn around June.
>
> > osgversion says 2.5.1.
>
> > svn info gives:
> > Revision: 8413 for OSG
> > and
> > Revision: 914 for VPB
>
> > I'll add the info to the example page.
>
> > regards
> > jp
>
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