Do you really need a screen shot, or do you just need a count of visible
pixels? If the latter, then occlusion query will do this for you. You'd
need to add a draw callback to the object that issues the query, draws
it, then waits for the pixel count query result.
Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ <http://www.skew-matrix.com/>
+1 303 859 9466
Martin Aasen wrote:
Hi,
I have a scene with a "hidden" object for the person using the application to
discover and identify. What I want is a screen shot functionality which focuses on this
object but keeps the resolution of the original rendering, to be able to analyze how many
pixels the object covered when it was identified etc. I have used the screen shot
tutorial available at osgHelp to capture a screen shot of the whole rendering:
osg::ref_ptr<osg::Image> rImage = new osg::Image;
rImage->readPixels( 0, 0, 512, 512, GL_RGB, GL_UNSIGNED_BYTE );
osgDB::writeImageFile( *rImage, "screenshot.jpg" );
What I want to do is:
osg::ref_ptr<osg::Image> rImage = new osg::Image;
rImage->readPixels( objectXmin, objectYmin, objectXmax,
objectYmax, GL_RGB, GL_UNSIGNED_BYTE );
osgDB::writeImageFile( *rImage, "screenshot.jpg" );
Can anyone give me some pointers on how to get the coordinates objectXmin and
so on?
Help is much appreciated!
Cheers,
Martin
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=20920#20920
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