Hi Jonathan, You can get the context ID from the global osg::State object. You can also use the osg::State object to bind the texture as well. So to read the image for a texture, you could do the following:
osg::State *state; // TODO: Get access to state object texture->apply(*state) osg::ref_ptr<osg::Image> img = new osg::Image; img->readImageFromCurrentTexture(state->getContextID(), false); This code will need to be executed within the OpenGL context associated with the state object. Cheers, Farshid On Mon, Jun 3, 2013 at 8:51 AM, Jonathan Mclaughlin <jonat...@mve.com>wrote: > Hi,**** > > ** ** > > I am looking for a bit of help with a problem I’ve been having. I’m > trying to take a screenshot of an osg scene, scale it up while maintaining > resolution, and save the result out to an image file. **** > > ** ** > > At the moment, I have looked at the osgdistortion example and have managed > to create a texture and display it on a textured quad. However, when I > attempt to read the pixels out to an image, whether from the camera or the > texture, nothing is produced. I am unsure as to the best way to go about > this as it seems it should be simple to read the pixels from the frame > buffer object or the texture but I have had no joy as yet. **** > > It seems like perhaps using osg::Image:: > *readImageFromCurrentTexture*<http://trac.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00305.html#e7e7a51a074aa4b4e0931b7fd7a98af9>() > would be the best way to do this but I was having problems getting the > context ID. I could possibly get this within a camera call back?... I > notice also within the documentation this methods description says “Read > the contents of the current bound texture” – Is there something more I have > to do to make the texture “bound”?**** > > ** ** > > Thanks for any info,**** > > ** ** > > ** ** > > Jonathan McLaughlin > Software Engineer > > ________________________________ > Midland Valley will next be presenting at Hedberg Research Conference, > 23rd – 27th June 2013**** > > Midland Valley Exploration Ltd. > 144 West George Street > Glasgow G2 2HG > United Kingdom**** > > Tel: +44 (0) 141 332 2681 > Fax: +44 (0) 141 332 6792**** > > The structural geology experts **** > > ** ** > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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