Hi Robert
I need to take the image without changing the present view
on the screen.. The view which my camera has and the view which my screen
has are completely different.If I add the camera to the viewer,the screen
might be showing what view my camera has which I dont want.. Can you please
guide as to how this could be achieved.
ThankYou
Deepti
On Nov 30, 2007 11:53 AM, Robert Osfield <[EMAIL PROTECTED]> wrote:
> 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.
> >
> > _______________________________________________
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> > osg-users@lists.openscenegraph.org
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> >
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