Re: Texture Mapping

Hello Valeri,

The example you gave me seems what I want. I will start from your macro and suggestions Matevz told me.

Thank you.

Regards,

OKUMURA, Akira oxon_at_ceres.phys.s.u-tokyo.ac.jp Department of Physics, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033
TEL/FAX +81 3-5841-4173/4059
Skype : okumura.akira

On 2008/05/26, at 14:42, Fine, Valeri wrote:

> Dear Akira,
>
> I am sorry, I forgot to provide the link to the ROOT macro.
> Here you are the screen snapshot
> http://root.bnl.gov/QtRoot/pictures/HelloEarth.gif
>
> produced by the 20 lines long ROOT macro (it uses the standard ROOT
> plug-in and its Coin implementation)
> http://root.bnl.gov/QtRoot/root/qtExamples/HelloEarth/earth.C
> ROOT macro
>
> void earth()
> {
> // Draw the globe using "worldmap.bmp" texture file
> if ( gSystem->AccessPathName("earth.iv") ) {
> // Create the Inventor file if needed
> ofstream out("earth.iv");
> out << "#Inventor V2.1 ascii" << endl;
> out << " Texture2 { filename \"worldmap.bmp\" " << endl;
> out <<" model REPLACE } "<< endl;
> out << "Sphere { radius 10 }" << endl;
> }
> TCanvas *c = new TCanvas;
> c->SetFillColor(kBlack);
> TVirtualViewer3D *viewer =0;
> if (viewer = TVirtualViewer3D::Viewer3D(c,"oiv")) {
> gEnv->SetValue("Gui.InventorBackgroundShape","earth.iv");
> gEnv->SetValue("Gui.SnapShotFileCounter","100");
> // Start ROOT 3D viewer
> viewer->BeginScene(); viewer->EndScene();
> }
> }
>
> It generates the picture from the texture file:
>
> http://root.bnl.gov/QtRoot/root/qtExamples/HelloEarth/worldmap.bmp
>
> You can replace on line
>
> out << " Texture2 { filename \"worldmap.bmp\" " << endl;
>
> in the macro above to use your own texture file as well.
> I think you can use this technique right now (it is very simple and
> requires no OpenGL / Open Inventor / C++ knowledge) and switch to
> the "official ROOT class later on.
>
> As my Acat 2007 Workshop talk mentioned, the technique above can be
> used to attach any Coin3D node to any ROOT 3D class object to get
> the mixed ROOT/Coin 3D scene as well.
> (see http://agenda.nikhef.nl/contributionDisplay.py?contribId=105&amp;sessionId=15&amp;confId=55
> )
>
> Hope this helps, Valeri
>
> ________________________________
>
> From: owner-roottalk_at_root.cern.ch on behalf of Fine, Valeri
> Sent: Mon 5/26/2008 1:15 PM
> To: OKUMURA, Akira; ROOT Talk
> Subject: RE: [ROOT] Texture Mapping
>
>
>
> Hello Akira,
>
> Do you need something like
> http://doc.coin3d.org/Coin/classSoTextureCoordinateSphere.html
>
> backed with
>
> http://doc.coin3d.org/Coin/classSoGeoCoordinate.html
>
> thank you.
> Valeri
>
>
> ________________________________
>
> From: owner-roottalk_at_root.cern.ch on behalf of OKUMURA, Akira
> Sent: Mon 5/26/2008 7:47 AM
> To: ROOT Talk
> Subject: [ROOT] Texture Mapping
>
>
>
> Hello ROOTers,
>
> I would like to show a sphere of which surface is a texture mapping of
> an all-sky image of cosmic gamma rays. Is there any ROOT function to
> create such sphere using OpenGL? If not, which ROOT classes are good
> starting point?
>
> I know that OpenGL itself has functions to handle texture mapping but
> I am not an expert of OpenGL. So I am wondering if I can easily access
> OpenGL's texture mapping via ROOT system.
>
> Regards,
>
> OKUMURA, Akira oxon_at_ceres.phys.s.u-tokyo.ac.jp
> Department of Physics, The University of Tokyo
> 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033
> TEL/FAX +81 3-5841-4173/4059
> Skype : okumura.akira
>
>
>
>
>
Received on Tue May 27 2008 - 15:56:41 CEST