[osg-submissions] Gdal plugin tweaks

[Frauciel Luc]

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
Unité Calcul, 3D et réalité virtuelle
Service Systèmes et Technologies de l'Information
3, av C. Guillemin BP 6009 - 45060 Orléans Cedex 2, France
Tél. 02 38 64 35 65
Fax 02 38 64 39 70
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