Hi Deepti, A Camera has to be rendered before the image is populated, you have to add it to a viewer and run a frame.
Robert. On Nov 30, 2007 10:19 AM, deepti g <[EMAIL PROTECTED]> wrote: > Hi > My problem is regarding taking an image of any intermediate node. If > the user gives the name of a node,I need to display its image on screen. The > algorithm I used is : > 1)set up a node visitor and make it traverse the entire scenegraph > > 2) If there is a node with the same name as that given by the user,get the > nodepath which was used to reach that node and get the transformation > matrix..(i.e., the entire transformation which is required to get to that > node's position) > > osg::Matrix matrix= osg::computeWorldToLocal(NodeVisitor->getNodePath() > ); //the transformation matrix > > 3)Now,according to me,all I need to do is create a camera and set its view > matrix to be this matrix.So , I did this: > > osg::Camera *camera=new osg::Camera(); > camera->setViewport(new osg::Viewport(0,0, width, height)); > camera->setProjectionMatrixAsOrtho2D(0,width,0,height); //FIXME > camera->setRenderTargetImplementation ( osg::Camera::FRAME_BUFFER_OBJECT); > camera->setViewMatrix(matrix); > > 4) Then I attached an osg::Image object to this camera and tried to record > the image. > > osg::Image* shot = new osg::Image(); > shot->allocateImage(width, height, 24, GL_RGB, GL_UNSIGNED_BYTE); > camera->attach(osg::Camera::COLOR_BUFFER, shot); > osgDB::writeImageFile(*shot,"image_file.png"); > > But the image which Iam getting is completely black.I have no idea where Iam > going wrong..Can anybody please point out where my mistake is? > > ThankYou > Deepti. > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
