Hi all, when using my application with the Oculus I get the following GL error at every frame: *Warning: detected OpenGL error 'invalid operation' after applying attribute Viewport *
This error is coming from the call RenderStage::drawImplementation() <https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgUtil/RenderStage.cpp#L1333> but the _viewport is valid. I'm not so familiar with the backend to understand where this error might come from. Any hint to debug this? Note: I'm using the Oculus through osgOculusViewer <https://github.com/bjornblissing/osgoculusviewer>. The sample Oculus viewer works fine without GL errors. My app is setup the same way, I cannot spot any sensible difference. I'm using win10, osg 3.6.3 Thanks, Riccardo
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