Ok.. thanks for the information... Good stuff... One last question... Is it possible to switch off a camera(s) in the chain and only render with the remaining camera(s)? In other words render with 1, 2 or 3 passes?
W On Wed, Nov 4, 2009 at 2:39 PM, Paul Martz <[email protected]> wrote: > Wyatt Earp wrote: >> >> If I have a prerender camera for rtt, and another >> camera which will take as input the texture from the rtt camera do >> some "stuff" then render to texture the output, and then a third >> camera which takes camera 2s output as input and performs then final >> render... what would my scenegraph look like? > > It really depends on how you want the Viewer's Camera manipulator to work. > Do you want it to manipulate Camera 1 or do you want it to manipulate your > final render camera? It also depends on what kind of scene geometry you are > rendering for each of your Cameras. > > Here's one way to do it: > > I would have your Camera 2 configured as prerender at the top of the scene > graph. I would have your Camera 1 also configured as prerender and added as > a child to Camera 2. The I would setSceneData in osgViewer::Viewer, passing > in Camera 2 -- osgViewer's built-in Camera will be the "final render" camera > in your example. > > The problem you typically run into with this kind of setup is that you want > to attach a camera manipulator to the osgViewer::Viewer, but you want it to > manipulate the matrices in Camera 1, not the top-level Viewer ("final > render") Camera. You can do this with some fairly hairy rewiring, but... > > Here's another way to do it: > > Use the osgViewer::Viewer Camera as Camera 1 in your example. So you'll need > to call Viewer::getCamera()->attach to make it into an RTT Camera (just like > you would any Camera). For the top of your scene graph, you'll probably want > a Group with Camera 2 as a child. Camera 2 is configured as post render, and > it will have the "final render" Camera as a child, also set up to post > render. In addition to having Camera 2 as a child, your top Group node will > probably also be the parent of the geometry you need to render in your first > render pass. > > With this configuration, the camera manipulator attached to Viewer will > manipulate the matrices in Camera 1 without the need for fancy rewiring. > That is the most common case, as Camera 1 in your example is usually the > parent of a large scene graph, whereas Camera 2 and the "final render" > Camera are usually just rendering screen-oriented textured quads and > therefore do not need a camera manipulator. > -Paul > _______________________________________________ > 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
