# Creating and Viewing Geometries

    {
       //
       // This macro generates two canvases.
       // The  first Canvas
       // has 2 views of the ATLAS detector.
       // The  second Canvas
       // has 2 views of the NA49 detector.
       //
       gROOT.Reset();
       TCanvas *c1 = gROOT->FindObject("c1"); if (c1) c1->Delete();
       c1 = new TCanvas("c1","The ATLAS canvas",200,10,700,780);

       gBenchmark->Start("atlasna49");
       //
       // Inside the ATLAS canvas, we create 2 pads for 2 different ATLAS views
       //
       TPad oute("oute","Outer Detector",0.02,0.02,0.48,0.82,18);
       TPad gaas("cryo","Ga Arsenite Detector",0.52,0.02,0.98,0.82,18);
       oute.Draw();
       gaas.Draw();
       TPaveLabel atlastitle(0.1,0.86,0.9,0.98,"Two views of the ATLAS detector");
       atlastitle.SetFillColor(28);
       atlastitle.Draw();
       //
       // Connect ROOT file with the ATLAS detector geometry.
       // See TGeometry for explanations how this file was produced.
       //
       TFile atgeom("atlas.root");
       //
       //
       // ATLAS is a barrel detector. Let's make an exploded view.
       atlas.cd();    //Set current geometry
       atlas.SetBomb(2);
       //
       // Set colors
       FMUC2.SetLineColor(5);
       RPCB1.SetLineColor(3);
       RPTI1.SetLineColor(4);
       RPT12.SetLineColor(4);
       RPT23.SetLineColor(3);
       RPT34.SetLineColor(3);
       oute.cd();    //Set current pad
       OUTE1.Draw();
       c1->Update();
       GAAS1.SetVisibility(0);
       GDSI2.SetVisibility();
       GDSI2.SetLineColor(5);
       GSUP1.SetLineColor(2);
       gaas.cd();
       GAAS1.Draw();
       c1->Update();
       //
       // Repeat similar operation for the NA49 detector.
       //
       TCanvas *c2 = gROOT->FindObject("c2"); if (c2) c2->Delete();
       c2 = new TCanvas("c2","The NA49 canvas",280,50,700,780);

       TPad all("all","A Global view of NA49",0.02,0.02,0.48,0.82,18);
       TPad tof("tof","One Time Of Flight element",0.52,0.02,0.98,0.82,18);
       all.Draw();
       tof.Draw();
       TPaveLabel na49title(0.1,0.86,0.9,0.98,"Two views of the NA49 detector");
       na49title.SetFillColor(28);
       na49title.Draw();
       //
       TFile nageom("na49.root");
       na49.SetBomb(1.2);
       na49.cd();    //Set current geometry
       all.cd();     //Set current pad
       na49.Draw();
       c2.Update();
       tof.cd();
       TOFR1.Draw();
       c2.Update();

       gBenchmark->Show("atlasna49");

       // To have a better and dynamic view of any of these pads,
       // you can click with the middle button of your mouse to select it.
       // Then select "View with x3d" in the VIEW menu of the Canvas.
       // Once in x3d, you are in wireframe mode by default.
       // You can switch to:
       //   - Hidden Line mode by typing E
       //   - Solid mode by typing R
       //   - Wireframe mode by typing W
       //   - Stereo mode by clicking S (and you need special glasses)
       //   - To leave x3d type Q
    }

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