[osg-submissions] Gdal plugin tweaks

[Robert Osfield]

Thanks Luc, I've go ahead and merged your changes so they are now
checked in to SVN.

I would be nice to import the  coordinate system string, perhaps even
set up an osgTerrain::Locator for the data.   Perhaps even support
osgTerrain directly with the plugin passing back a full
osgTerrain::Layer object, with the Locator, no data values etc all set
up.  ReaderWriter::readObject() method would need to used for this
purpose.

My current focus has shifted from osgTerrain to VPB, but I'll will
jumping between the two over time.   For instance its my intention of
the input to VPB to related to the way that osgTerrain now manages
Layers and Locators, and in fact share the same source data file
format.  More on this as its developed, I'll ping osg-users as the
work develops.

Robert.

On 8/7/07, Frauciel Luc <L.Frauciel at brgm.fr> wrote:
> Hi,
>
> First it's great that the gdal plugin has returned to the main distribution (it was a pain to handle).
>
> Gdal plugins reads lots of information that is not taken into account in ReadHeigthField for example.
> Attached a modification that read the HeigthField position and X,Yintervals.
> I also removed the limitation to 1024*1024 to 4096*4096, because when you are preprocessing your data with OSG, it can be useful to read large images/heigthfields. Is there a reason (other than hardware limitations for textures) for this limit ?
>
> Another thing that would be great would be to read NoData value and put it in the osg::HeightField structure.
> It could also be useful for the new osgTerrain::Field structure with NoDataValue (ValidDataOperator) or to handle nodata at runtime (through geometry or vertex shaders for example).
>
> I'm impressed by the great job already done on osgTerrain. Would it be possible to have an example of the .terrain extension, because I dont really understand what I should put in my .terrain file.
>
>   Best Regards
>
>    Luc
>
>
> Luc FRAUCIEL - BRGM
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