Hi Tufan,

Yes C:\Users\Tufan\Desktop\New Folder\OpenSceneGraph-2.8.2\bin is in my path. I 
don't get any error messages I can load bmp image but cannot png. I don't know 
why.

The difference is that the BMP plugin does not need any additional DLLs (other than the plugin itself of course) but the PNG plugin does (something like libpng13.dll). So I suspect you don't have this DLL.

This DLL is part of the 3rdParty dependencies, so you either have it already (if you compiled OSG from source) or you need to download the appropriate 3rdParty dependencies for your version of Visual Studio. See this page:

http://www.openscenegraph.org/projects/osg/wiki/Downloads/Dependencies

You could then copy all the DLLs from your 3rdparty\bin folder to your OpenSceneGraph-2.8.2\bin folder so it will be found when osgDB loads the PNG plugin.

Hope this helps,

J-S
--
______________________________________________________
Jean-Sebastien Guay    [email protected]
                               http://www.cm-labs.com/
                        http://whitestar02.webhop.org/
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