Hi all,

we're using FBOViewport for IDBuffer rendering to determine which nodes are hit 
by a certain mouse click. Up to now that worked like a charm.
My current problem is that I have a machine in front of me that fails to 
generate the IDBuffer rendering.

Graphics card: Quadro FX 3000, GLVersion 2.1.2
Driver:  Quadro Release 169 WHQL 169.96 6.6.2008 (it's the newest :-() 

If I check for GL_EXT_framebuffer_object, it is supported. But when trying to 
access the FBO (glCallList, glReadPixels) error 0x5060 
(INVALID_FRAMEBUFFER_OPERATION_EXT) is thrown. Do you have any idea what may 
cause that? May it be a driver implementation issue?

If possible I would like to build a fallback for selection handling if the 
IDBuffer method is not possible. Do you have any idea how to determine, if the 
IDBuffer rendering is possible or not? My first ideas were GLVersion and 
support of GL_EXT_framebuffer_object, but that seems to be not enough.

Thanks,
Michael

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