Hi Martin,
Am 02.02.2011 14:35, schrieb "Martin Großer":
Hello David,
So I use the FRAME_BUFFER_OBJECT and I have a NVIDIA GTX 470 grafics card.
I tried the osgprerendercubemap, but I cannot print out the frame rate.
Additionally I tried the osgprerender example and I get a frame rate of around
3500 FPS.
Here my Implementation:
osg::ref_ptr<osg::Image> img = osgDB::readImageFile("image.tga");
osg::ref_ptr<osg::Group> rtt = new osg::Group;
root->addChild(rtt);
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->addChild( scene );
camera->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
camera->setViewport(0,0,2048,2048);
camera->setRenderOrder(osg::Camera::PRE_RENDER, 0);
camera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
camera->attach(osg::Camera::COLOR_BUFFER, img, 0, 0);
Your performance Problem is in the previous line:
By attaching an image you instruct OSG to fetch
the whole image back to CPU memory (for each frame!).
If this is what you really want, it probably is as fast
as it will get.
If you want to use the rendered image on the GPU,
then you should attach an osg::Texture instead.
See osgprerender example, with "useImage=false".
rtt->addChild(camera.get());
Is the image format (internal format) a problem?
Thanks
Martin
Cheers,
Peter
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