I found a interesting solution:

Code:

std::string texture_file_name =
osgDB::getStrippedName(image->getFileName());
texture_file_name += ".dds";
image->setFileName(texture_file_name);
osgDB::writeImageFile(*image, image->getFileName()




actually i just changed file extent name from rgb to dds...and it works...i get 
a lot dds file on disk...

I still don't get it...how it works...

maybe can somebody help me out to get a right way export compressed texture to 
file... :O

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http://forum.openscenegraph.org/viewtopic.php?p=67629#67629





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