Thanks a lot, this is the answer I needed. Just another question: suppose that I need to draw different 2D drawings onto the same 3D scene, how can I set the desired rendering order for those slave cameras?
I mean, I want to make sure that a text will always appear over a 2D rectangle created onto the 3D scene. Should I set the camera for the rectangle as cameraforRectangle::setRenderOrder(osg::Camera::POST_RENDER, 0); and cameraforText::setRenderOrder(osg::Camera::POST_RENDER, 1); ??? Does it work that way? Thanks, Gianluca From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert Osfield Sent: lunedì 23 marzo 2009 12.09 To: OpenSceneGraph Users Subject: Re: [osg-users] 2D drawing over a 3D drawing HI Gianluca, Please have a look at the osghud example. Robert. 2009/3/23 Gianluca Natale <gianluca.nat...@adstorino.it> Hi All. I need to draw a 2D drawing (a single wireframe rectangle) over a 3D drawing of a scene. Basically I need it to show a window selection in the scene. In OpenGL, I would set a perspective projection like glFrustum( ), draw the scene, then set a glOrtho2D( ), and draw the rectangle. Finally I would call a swap buffers. How can I do it with OSG? I mean, in OSG the projection matrix is associated with a camera. So, should I use two cameras, one for the 3D scene, the other just for the 2D rectangle? In camera::frame there is the swap of the back and front buffers. But I would like to swap those buffers just at the end, after drawing everything. So, should I call the drawing of the 3D camera without swapping, then the drawing of the 2D camera with swapping at the end? I read in the quick start guide of OSG of the thread for draw traversal. Since I call camera::Frame twice, does OSG create 2 different threads? Is there any conflict between those threads, since they draw with different projection matrices? Thanks in advance Gianluca Natale _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.0.238 / Virus Database: 270.11.24/2018 - Release Date: 03/23/09 06:52:00
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