Hi,
I now managed to get true float values out of the render buffer by
specifying
>> image = new osg::Image;
>> image->allocateImage(width, height, 1, GL_RGB, GL_FLOAT);
>> image->setInternalTextureFormat(GL_RGB32F_ARB);
>> viewer->getCamera()->attach(osg::Camera::COLOR_BUFFER, image.get());
But the values are still clamped to 1.0. Any idea to get around that?
regards Ralph
Ralph Kern schrieb:
> hi folks,
>
> I'm looking for some way to get unclamped floating point values out of a
> render buffer. My goal is to produce HDRI images.
>
> I can fetch the image as rgb byte pixels, but I'm wondering how to get
> float values which may be greater than 1.0.
>
> I'm working on a ATI Radeon X1600.
>
> My current framework is like that:
>
>> int width = 512;
>> int height = 512;
>> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
>> osg::GraphicsContext::Traits;
>> traits->x = 0;
>> traits->y = 0;
>> traits->width = width;
>> traits->height = height;
>> traits->windowDecoration = false;
>> traits->doubleBuffer = false;
>> traits->sharedContext = 0;
>> traits->pbuffer = true;
>>
>> osg::ref_ptr<osg::GraphicsContext> gc =
>> osg::GraphicsContext::createGraphicsContext(traits.get());
>>
>> if (!gc.valid())
>> {
>> osg::notify(osg::NOTICE)<<"Failed to create pbuffer, failing back to
>> normal graphics window."<<std::endl;
>>
>> traits->pbuffer = false;
>> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
>> }
>>
>> if (gc.valid())
>> {
>> gc->realize();
>> gc->makeCurrent();
>> osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
>> viewer->getCamera()->setGraphicsContext(gc.get());
>> viewer->getCamera()->setViewport(0,0,width,height);
>> viewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
>>
>> // Init the main Root Node/Group
>> osg::ref_ptr<osg::Group> _root = new osg::Group;
>> osg::Shape *shape = new osg::Cylinder(Vec3f(0.5,0.5,-0.5), .4, .2);
>> osg::ShapeDrawable *drawable = new osg::ShapeDrawable(shape);
>> drawable->setColor(Vec4(1,1,0,1));
>> osg::Geode *geode = new osg::Geode();
>> geode->addDrawable(drawable);
>>
>> _root->addChild(geode);
>> _root->getOrCreateStateSet()->setMode(GL_LIGHTING,
>> osg::StateAttribute::OFF);
>>
>> viewer->setSceneData(_root.get());
>>
>> image = new osg::Image;
>> image->allocateImage(width, height, 1, GL_RGB, GL_UNSIGNED_BYTE);
>> viewer->getCamera()->attach(osg::Camera::COLOR_BUFFER, image.get());
>>
>> viewer->getCamera()->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
>> viewer->getCamera()->setClearColor(Vec4(.7,0,0,0));
>> viewer->getCamera()->setProjectionMatrixAsOrtho(0, 1, 0, 1, 0, 1);
>> viewer->getCamera()->setViewMatrix(matrix);
>>
>> viewer->frame();
>> viewer->getCamera()->detach(osg::Camera::COLOR_BUFFER);
>>
>> osgDB::writeImageFile(*image,std::string("C:\\tmp\\buffer.tif", NULL);
>> }
>
>
> regards Ralph Kern
>
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