Logo ROOT  
Reference Guide
 
Loading...
Searching...
No Matches
rootgeom.C File Reference

Detailed Description

Definition of a simple geometry (the 4 ROOT characters)

U

void rootgeom(bool vis = true)
{
// gStyle->SetCanvasPreferGL(true);
TGeoManager *geom = new TGeoManager("simple1", "Simple geometry");
//--- define some materials
TGeoMaterial *matVacuum = new TGeoMaterial("Vacuum", 0,0,0);
TGeoMaterial *matAl = new TGeoMaterial("Al", 26.98,13,2.7);
// //--- define some media
TGeoMedium *Vacuum = new TGeoMedium("Vacuum",1, matVacuum);
TGeoMedium *Al = new TGeoMedium("Root Material",2, matAl);
//--- define the transformations
TGeoTranslation *tr1 = new TGeoTranslation(20., 0, 0.);
TGeoTranslation *tr2 = new TGeoTranslation(10., 0., 0.);
TGeoTranslation *tr3 = new TGeoTranslation(10., 20., 0.);
TGeoTranslation *tr4 = new TGeoTranslation(5., 10., 0.);
TGeoTranslation *tr5 = new TGeoTranslation(20., 0., 0.);
TGeoTranslation *tr6 = new TGeoTranslation(-5., 0., 0.);
TGeoTranslation *tr7 = new TGeoTranslation(7.5, 7.5, 0.);
TGeoRotation *rot1 = new TGeoRotation("rot1", 90., 0., 90., 270., 0., 0.);
TGeoCombiTrans *combi1 = new TGeoCombiTrans(7.5, -7.5, 0., rot1);
TGeoTranslation *tr8 = new TGeoTranslation(7.5, -5., 0.);
TGeoTranslation *tr9 = new TGeoTranslation(7.5, 20., 0.);
TGeoTranslation *tr10 = new TGeoTranslation(85., 0., 0.);
TGeoTranslation *tr11 = new TGeoTranslation(35., 0., 0.);
TGeoTranslation *tr12 = new TGeoTranslation(-15., 0., 0.);
TGeoTranslation *tr13 = new TGeoTranslation(-65., 0., 0.);
TGeoTranslation *tr14 = new TGeoTranslation(0,0,-100);
TGeoCombiTrans *combi2 = new TGeoCombiTrans(0,0,100,
new TGeoRotation("rot2",90,180,90,90,180,0));
TGeoCombiTrans *combi3 = new TGeoCombiTrans(100,0,0,
new TGeoRotation("rot3",90,270,0,0,90,180));
TGeoCombiTrans *combi4 = new TGeoCombiTrans(-100,0,0,
new TGeoRotation("rot4",90,90,0,0,90,0));
TGeoCombiTrans *combi5 = new TGeoCombiTrans(0,100,0,
new TGeoRotation("rot5",0,0,90,180,90,270));
TGeoCombiTrans *combi6 = new TGeoCombiTrans(0,-100,0,
new TGeoRotation("rot6",180,0,90,180,90,90));
//--- make the top container volume
Double_t worldx = 110.;
Double_t worldy = 50.;
Double_t worldz = 5.;
TGeoVolume *top = geom->MakeBox("TOP", Vacuum, 270., 270., 120.);
geom->SetTopVolume(top);
TGeoVolume *replica = geom->MakeBox("REPLICA", Vacuum,120,120,120);
replica->SetVisibility(kFALSE);
TGeoVolume *rootbox = geom->MakeBox("ROOT", Vacuum, 110., 50., 5.);
rootbox->SetVisibility(kFALSE);
//--- make letter 'R'
TGeoVolume *R = geom->MakeBox("R", Vacuum, 25., 25., 5.);
R->SetVisibility(kFALSE);
TGeoVolume *bar1 = geom->MakeBox("bar1", Al, 5., 25, 5.);
R->AddNode(bar1, 1, tr1);
TGeoVolume *bar2 = geom->MakeBox("bar2", Al, 5., 5., 5.);
R->AddNode(bar2, 1, tr2);
R->AddNode(bar2, 2, tr3);
TGeoVolume *tub1 = geom->MakeTubs("tub1", Al, 5., 15., 5., 90., 270.);
R->AddNode(tub1, 1, tr4);
TGeoVolume *bar3 = geom->MakeArb8("bar3", Al, 5.);
TGeoArb8 *arb = (TGeoArb8*)bar3->GetShape();
arb->SetVertex(0, 15., -5.);
arb->SetVertex(1, 0., -25.);
arb->SetVertex(2, -10., -25.);
arb->SetVertex(3, 5., -5.);
arb->SetVertex(4, 15., -5.);
arb->SetVertex(5, 0., -25.);
arb->SetVertex(6, -10., -25.);
arb->SetVertex(7, 5., -5.);
R->AddNode(bar3, 1, gGeoIdentity);
//--- make letter 'O'
TGeoVolume *O = geom->MakeBox("O", Vacuum, 25., 25., 5.);
TGeoVolume *bar4 = geom->MakeBox("bar4", Al, 5., 7.5, 5.);
O->AddNode(bar4, 1, tr5);
O->AddNode(bar4, 2, tr6);
TGeoVolume *tub2 = geom->MakeTubs("tub1", Al, 7.5, 17.5, 5., 0., 180.);
O->AddNode(tub2, 1, tr7);
O->AddNode(tub2, 2, combi1);
//--- make letter 'T'
TGeoVolume *T = geom->MakeBox("T", Vacuum, 25., 25., 5.);
T->SetVisibility(kFALSE);
TGeoVolume *bar5 = geom->MakeBox("bar5", Al, 5., 20., 5.);
T->AddNode(bar5, 1, tr8);
TGeoVolume *bar6 = geom->MakeBox("bar6", Al, 17.5, 5., 5.);
T->AddNode(bar6, 1, tr9);
rootbox->AddNode(R, 1, tr10);
rootbox->AddNode(O, 1, tr11);
rootbox->AddNode(O, 2, tr12);
rootbox->AddNode(T, 1, tr13);
replica->AddNode(rootbox, 1, tr14);
replica->AddNode(rootbox, 2, combi2);
replica->AddNode(rootbox, 3, combi3);
replica->AddNode(rootbox, 4, combi4);
replica->AddNode(rootbox, 5, combi5);
replica->AddNode(rootbox, 6, combi6);
top->AddNode(replica, 1, new TGeoTranslation(-150, -150, 0));
top->AddNode(replica, 2, new TGeoTranslation(150, -150, 0));
top->AddNode(replica, 3, new TGeoTranslation(150, 150, 0));
top->AddNode(replica, 4, new TGeoTranslation(-150, 150, 0));
//--- close the geometry
geom->CloseGeometry();
//--- draw the ROOT box.
// by default the picture will appear in the standard ROOT TPad.
//if you have activated the following line in system.rootrc,
//it will appear in the GL viewer
//#Viewer3D.DefaultDrawOption: ogl
geom->SetVisLevel(4);
if (vis) top->Draw("ogle");
}
constexpr Bool_t kFALSE
Definition RtypesCore.h:94
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kBlue
Definition Rtypes.h:66
@ kYellow
Definition Rtypes.h:66
R__EXTERN TGeoIdentity * gGeoIdentity
Definition TGeoMatrix.h:537
virtual void SetVertex(Int_t vnum, Double_t x, Double_t y)
Class describing rotation + translation.
Definition TGeoMatrix.h:317
The manager class for any TGeo geometry.
Definition TGeoManager.h:44
TGeoVolume * MakeArb8(const char *name, TGeoMedium *medium, Double_t dz, Double_t *vertices=nullptr)
Make an TGeoArb8 volume.
void SetVisLevel(Int_t level=3)
set default level down to which visualization is performed
void CloseGeometry(Option_t *option="d")
Closing geometry implies checking the geometry validity, fixing shapes with negative parameters (run-...
TGeoVolume * MakeBox(const char *name, TGeoMedium *medium, Double_t dx, Double_t dy, Double_t dz)
Make in one step a volume pointing to a box shape with given medium.
void SetTopVolume(TGeoVolume *vol)
Set the top volume and corresponding node as starting point of the geometry.
TGeoVolume * MakeTubs(const char *name, TGeoMedium *medium, Double_t rmin, Double_t rmax, Double_t dz, Double_t phi1, Double_t phi2)
Make in one step a volume pointing to a tube segment shape with given medium.
Base class describing materials.
Media are used to store properties related to tracking and which are useful only when using geometry ...
Definition TGeoMedium.h:23
Class describing rotations.
Definition TGeoMatrix.h:168
Class describing translations.
Definition TGeoMatrix.h:116
TGeoVolume, TGeoVolumeMulti, TGeoVolumeAssembly are the volume classes.
Definition TGeoVolume.h:43
void SetVisibility(Bool_t vis=kTRUE) override
set visibility of this volume
virtual TGeoNode * AddNode(TGeoVolume *vol, Int_t copy_no, TGeoMatrix *mat=nullptr, Option_t *option="")
Add a TGeoNode to the list of nodes.
void Draw(Option_t *option="") override
draw top volume according to option
void SetLineColor(Color_t lcolor) override
Set the line color.
TGeoShape * GetShape() const
Definition TGeoVolume.h:190
Author
Andrei Gheata

Definition in file rootgeom.C.