Hi Carsten, was there a special reason why FBOViewport doesn't read back depth buffer values? Looking at the code it seems to me that changing the code around line 1013 - 1049 in OSGFBOViewport.cpp may do the trick, expecting that texturechunk internal format is something like GL_DEPTH_COMPONENT. What about the image format, that seems to be a litte bit more tricky.
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