Depending on our hardware, the viewer may run in multithreaded mode, which means you can't access the openGL context everytime everywhere. Try setting your viewer into singlethreaded mode with ViewerBase::setThreadingModel( ... ) . The context should be available all the time now...
Richard ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eduardo Gutiérrez Sanmartín Sent: Friday, November 16, 2007 1:47 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Taking screenshots using OSG 2.2 Hello, While using OSG version 1.20, I was taking screenshots with the following code: while( !viewer.done() ) { viewer.frame(); // Here I get x, y, width and height. osg::Image *image = new osg::Image; image->readPixels(x, y, width, height, GL_RGB, GL_UNSIGNED_BYTE); osgDB::writeImageFile(*image, "capture.bmp"); } The obtained image was correct - however, with OSG 2.2 it is not. I am obtaining a totally black image (and it seems that x, y, width and height are the right values). Is there something wrong here? How do I take a screenshot of my application? Thx! Edu
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