Hi,
I have some problems with render to texture, I made a code and I don't
understand why it didn't work. I try to take a screenshot with a render to
texture. This is my code
the first part :
Code:
int osgBuilder::start()
{
osg::ref_ptr<osgViewer::Viewer> viewer = new
osgViewer::Viewer;
osg::ref_ptr<myKeyboardEventHandler> kbHdl = new
myKeyboardEventHandler;
osg::Matrix
cameraPosition;
cameraPosition.translate(0., -100., 0.);
viewer->getCamera()->setViewMatrix(cameraPosition);
viewer->getCamera()->setClearColor(osg::Vec4(0.3, 0.2, 0.5, 1.));
viewer->addEventHandler(kbHdl);
viewer->setUpViewInWindow(200, 200, 800, 600);
osg::ref_ptr<osg::Group> root = new osg::Group;
osg::ref_ptr<osg::Group> worldParent = new osg::Group;
osg::ref_ptr<osg::Group> world = this->createScene(); //my world
content
root->addChild(worldParent);
worldParent->addChild(world);
osg::ref_ptr<osg::Camera> rttCamera = kbHdl->CreateRttCam(viewer,
world); // Here I create the rtt camera
root->addChild(rttCamera);
viewer->setSceneData(root);
return (viewer->run());
}
Code:
osg::ref_ptr<osg::Camera>
myKeyboardEventHandler::CreateRttCam(osg::ref_ptr<osgViewer::Viewer> viewer,
osg::ref_ptr<osg::Group> worldNode)
{
if (worldNode == 0)
return 0;
//get the screen size
const int screenWidth =
viewer->getCamera()->getGraphicsContext()->getTraits()->width;
const int screenHeight =
viewer->getCamera()->getGraphicsContext()->getTraits()->height;
//Create the texture to render to
osg::ref_ptr<osg::Texture2D> renderTexture = new osg::Texture2D();
renderTexture->setTextureSize(screenWidth, screenHeight);
renderTexture->setInternalFormat(GL_RGBA);
renderTexture->setFilter(osg::Texture2D::MIN_FILTER,
osg::Texture2D::LINEAR);
renderTexture->setFilter(osg::Texture2D::MAG_FILTER,
osg::Texture2D::LINEAR);
//the osg::Image that is an attribute
this->textureImage = new osg::Image;
textureImage->allocateImage(screenWidth, screenHeight, 1, GL_RGBA,
GL_UNSIGNED_BYTE);
renderTexture->setImage(0, textureImage);
//copy the viewer camera attributes into the rttCamera
osg::ref_ptr<osg::Camera> textureCamera = new
osg::Camera(*viewer->getCamera());
//to be sure
textureCamera->setViewMatrix(viewer->getCamera()->getViewMatrix());
textureCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
textureCamera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
textureCamera->setViewport(0, 0, screenWidth, screenHeight);
textureCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
textureCamera->setRenderOrder(osg::Camera::PRE_RENDER);
textureCamera->attach(osg::Camera::COLOR_BUFFER, renderTexture.get());
textureCamera->attach(osg::Camera::COLOR_BUFFER,
this->textureImage.get());
textureCamera->setPostDrawCallback(new
MyCameraPostDrawCallBack(this->textureImage));
textureCamera->addChild(worldNode.get());
return (textureCamera);
}
My event handler will call a function when the touch 'p' is pressed and
register the osg::image on disk but the image is empty. I also don't understand
why my PostDrawCallback on the rttCamera isn't call.
Any clue ?
ps : Sorry for my english...
ps2 : I'm a beginner in OSG
Thank's a lot !
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=27227#27227
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