Logo ROOT  
Reference Guide
visualizeWavefrontObj.C File Reference

Detailed Description

Macro allowing to vizualize tessellations from Wavefront's .obj format.

#include <TROOT.h>
#include <TColor.h>
#include <TDatime.h>
#include <TRandom3.h>
#include <TGeoManager.h>
int randomColor()
gRandom = new TRandom3();
TDatime dt;
TColor *color = new TColor(ci, gRandom->Rndm(), gRandom->Rndm(), gRandom->Rndm());
return ci;
void visualizeWavefrontObj(const char *dot_obj_file="", bool check = false)
// Input a file in .obj format (https://en.wikipedia.org/wiki/Wavefront_.obj_file)
// The file should have a single object inside, only vertex and faces information is used
TString name = dot_obj_file;
TString sfile = dot_obj_file;
if (sfile.IsNull()) {
sfile = gROOT->GetTutorialsDir();
sfile += "/geom/teddy.obj";
name.ReplaceAll(".obj", "");
delete gGeoManager;
new TGeoManager(name, "Imported from .obj file");
TGeoMaterial *mat = new TGeoMaterial("Al", 26.98, 13, 2.7);
TGeoMedium *med = new TGeoMedium("MED", 1, mat);
TGeoVolume *top = gGeoManager->MakeBox("TOP", med, 10, 10, 10);
auto tsl = TGeoTessellated::ImportFromObjFormat(sfile.Data(), check);
if (!tsl) return;
TGeoVolume *vol = new TGeoVolume(name, tsl, med);
top->AddNode(vol, 1);
if (!gROOT->IsBatch()) top->Draw("ogl");
char name[80]
Definition: TGX11.cxx:110
R__EXTERN TGeoManager * gGeoManager
Definition: TGeoManager.h:602
#define gROOT
Definition: TROOT.h:404
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
The color creation and management class.
Definition: TColor.h:19
static Int_t GetFreeColorIndex()
Static function: Returns a free color index which can be used to define a user custom color.
Definition: TColor.cxx:2071
This class stores the date and time with a precision of one second in an unsigned 32 bit word (950130...
Definition: TDatime.h:37
Int_t GetTime() const
Return time in form of 123623 (i.e. 12:36:23)
Definition: TDatime.cxx:259
The manager class for any TGeo geometry.
Definition: TGeoManager.h:45
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.
Base class describing materials.
Definition: TGeoMaterial.h:36
Media are used to store properties related to tracking and which are useful only when using geometry ...
Definition: TGeoMedium.h:24
static TGeoTessellated * ImportFromObjFormat(const char *objfile, bool check=false, bool verbose=false)
Reader from .obj format.
TGeoVolume, TGeoVolumeMulti, TGeoVolumeAssembly are the volume classes.
Definition: TGeoVolume.h:49
virtual TGeoNode * AddNode(TGeoVolume *vol, Int_t copy_no, TGeoMatrix *mat=nullptr, Option_t *option="")
Add a TGeoNode to the list of nodes.
Definition: TGeoVolume.cxx:932
virtual void Draw(Option_t *option="")
draw top volume according to option
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Random number generator class based on M.
Definition: TRandom3.h:27
virtual void SetSeed(ULong_t seed=0)
Set the random generator seed.
Definition: TRandom.cxx:608
Double_t Rndm() override
Machine independent random number generator.
Definition: TRandom.cxx:552
Basic string class.
Definition: TString.h:136
const char * Data() const
Definition: TString.h:369
Bool_t IsNull() const
Definition: TString.h:407
Andrei Gheata

Definition in file visualizeWavefrontObj.C.