MVD with 2 and 3 stations

Based upon mvd_v20c_tr
mvd_v20f has first station removed,
mvd_v20g has first two stations removed,
The top and bottom plate are also removed.

Added a missing HexPly material in media.geo.

media.geo

@@ -79,6 +79,10 @@ BP_carbonfiber 4  12.011  1.0079  35.453  15.999  6.0  1.0  17.  8.0  1.5  0.892
                0  1  20.  .001
                0
 
+BP_HexPly      4  12.011  1.0079  35.453  15.999  6.0  1.0  17.  8.0  1.5  0.8926  0.0192  0.0271  0.0611
+               0  1  20.  .001
+               0
+
 // ---------------------------------------------------------------------------
 
 

mvd/mvd_v20g_tr.geo.info

+TFile* ofile
+TFile* nfile
+ofile = TFile::Open("mvd_v20c_tr.geo.root")
+nfile = TFile::Open("mvd_v20g_tr.geo.root","RECREATE")
+TGeoVolume* top = (TGeoVolume *) ofile->Get("Top")
+TGeoNode* node = top->GetNode("MVDscripted_1")
+TGeoNodeMatrix* nm
+TGeoVolume* ntop
+ntop = new TGeoVolume("Top", top->GetShape(), top->GetMedium())
+int id=0
+nm = (TGeoNodeMatrix *) node->GetDaughter(1)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+nm = (TGeoNodeMatrix *) node->GetDaughter(2)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+nm = (TGeoNodeMatrix *) node->GetDaughter(3)
+ntop->AddNode(nm->GetVolume(),id++,nm->GetMatrix())
+ntop->GetNodes()->Print()
+ntop->GetName()
+ntop->GetMedium()->Print()
+ntop->SetAsTopVolume()
+nfile->WriteTObject(ntop)
+nfile->Close()