Hi everyone.
I have some issues with rendering to a texture.
I am writing a plug-in for an application.
This application has a main-viewer-window, where it displays a scene.
My plug-in has an own window with a new viewer and everything.
The new window now needs a texture showing what the main window displays right
at this moment.
I need it to use it later on with an API for interlacing but for now I just
want to show it in the plug-in-window to see whether rendering-to-texture works
as it should.
That is why the plug-in-window show a screen-aligned-quad that displays this
texture. If I use an image as texture of the quad everything works as it
should, so my plug-in-window should be fine the way it is.
But if I use the texture I render using a camera in the main application's
scene I just get a black texture.
I create the following camera using information of the camera of the main
application which I get via an interface named "_billInterface" and attach the
texture:
osg::Camera* camera = new osg::CameraNode();
camera->setCullingActive(false);
camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set camera properties according to the main camera of the main
application
osg::Camera* billCamera = _billInterface->getCamera();
camera->setViewport(0,0,_billInterface->getGraphicsContext()->getTraits()->width,_billInterface->getGraphicsContext()->getTraits()->height);
camera->setProjectionMatrix(billCamera->getProjectionMatrix());
camera->setViewMatrix(billCamera->getViewMatrix());
camera->setReferenceFrame(billCamera->getReferenceFrame());
camera->setStateSet(billCamera->getStateSet());
camera->setRenderOrder(osg::CameraNode::PRE_RENDER,1);
camera->setRenderTargetImplementation(osg::CameraNode::FRAME_BUFFER_OBJECT);
camera->attach(osg::CameraNode::COLOR_BUFFER, texture.get());
Then I add the scene of the main application to the camera so that it shows
this scene.
camera->addChild(_billInterface->getScene());
Now I take this camera and put it into the scene graph of the main application:
_billInterface->getRootNode()->getParent(0)->addChild(camera);
(That way it is on one depth with the rootNode of the scene and the node
containing the HUD. I put it in there so that the camera's output is rendered
into the texture everytime the viewer of the main application is updated.)
I know that I get a texture that way because the quad that holds this texture
is normally red and after creating the camera and attaching the texture it
turns black.
I guess that either some camera properties are wrong or I have to put the
camera somewhere else.
Can someone give me a hint on what I might be doing wrong? What are the main
things I have to take care of when doing render-to-texture?
Is the texture automatically updated everytime the scene containing my
render-to-texture-camera is rendered?
Thanks in advance for any help,
Steffen
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