Alright, I found the problem.
 During the conversion, textures are lost, then when the shader reads a texture 
it finds nothing.

- Do you know how can I test it? I mean, if the texture slot (the specified 
unit) is empty, I would like to fill the fragment with the object color.

Too bad my textures are compressed .rgb, thus I can't export them in .osg as 
explained here 
(http://forum.openscenegraph.org/viewtopic.php?t=3337&postdays=0&postorder=asc&start=0).

Finally, the problem came only from me (as usual would say some), sorry for the 
wrong alert.

However, I'm still in big troubles with the Z-buffer, your help would be 
welcomed.


Thank you!

Cheers,
Maxime

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=16148#16148





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