Hi Valeri, I would like to display an Open Inventor scene using the ROOT "Open Inventor" viewer. Right now i did not find the way to do this. Do you know where i can find some test example how to do this? best regards, Denis Valeri Fine wrote: > Hello Glen, > > ROOT TGLViewer interface was designed to draw 3D object built from the > instances of TShape class > The 3D GL window is created by "OpenGL" implementation of > http://root.cern.ch/root/htmldoc/TGLViewerImp.html > class. > from the list of the methods of that class one may arrive at the conclusion > the only useful method there is > virtual void SetDrawList(UInt_t list). > That allow you to generate some OpenGL list within your code and pass it to > the TGLViewerImp class to be rendered. > > I'd like to stop here to repeat this class was designed to render ROOT 3D > objects. > > This means to get OpenGL view of some ROOT object one should > > 1. Create some instances of the ROOT 3d classes > 2. Apply the method TObject::Draw. As result the pointer to the object is > included > into the list of the objects of the current TPad object > 3. Call method TPad::x3d("OPENGL") as result the instance of the current > TPad loads > ROOT GL share library, creates an instance of the TGLViewer and > passes it the pointer > to the object to be rendered. > > This schema looks simple for the ROOT class users because the only step > he/she needs to perform is the step #1. > However it may cause extra problems just one wants to use ROOT GL viewer > > At the moment ROOT distribution provides two concrete implementation of that > viewer, namely > "plain GL viewer" and "Open Inventor" viewer. The later one is a good > example since it does allow to render just two kind of GL object, ROOT > generated and non-ROOT generated on one screen. This may provide you some > clues. > See some details: http://www.atsweb.neu.edu/hepvis01/Site/Talks/Talk010.pdf > > However if you are not going to render ROOT and non-ROOT 3D objects on one > screen the ROOT solution has no advantage against of any other viewer one > can find around. > > For example http://doc.trolltech.com/3.0/qglwidget.html and > http://www.qglviewer.de/ > It is my intention to use these classes to provide Qt-based implementation > of TGLViewer class > for Qt-based ROOT http://www.usatlas.bnl.gov/~fine/QtRootDownload.html > This may simplify your task. > However this needs some time and any assistance will be appreciated. > > My best regards, > Valeri > > > Hi, > > > > I would like use to OpenGL commands within the ROOT framework. Since ROOT > > uses OpenGL for 3D visualization, I believe this should be possible. My > > goal is to create an OpenGL window and render objects with textures, > > transparencies, etc., using gl* commands. Is this possible using the ROOT > > OpenGL window? If so, I would greatly appreciate pointers on how to get > > started. If not, are there any suggestions on how to use the advanced > > features of OpenGL within ROOT? > > > Thanks, > > > > Glen > >
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