geom_threejs.cxx File Reference

Detailed Description

The tutorial demonstrates how three.js model for geometry can be created and displayed.

In geom_threejs.cxx one uses RGeomDescription class from geometry viewer, which produces JSON data with all necessary information. Then RWebWindow is started and this information provided. In client.html one uses build function to create Object3D with geometry Then such object placed in three.js scene and rendered. Also simple animation is implemented

 
#include <ROOT/RGeomData.hxx>
 
#include <ROOT/RWebWindow.hxx>
 
std::shared_ptr<ROOT::RWebWindow> window;
 
TString base64;
 
 
void ProcessData(unsigned connid, const std::string &arg)
{
   if (arg == "get") {
      // send arbitrary text message
      window->Send(connid, base64.Data());
   } else if (arg == "halt") {
      // terminate ROOT
      window->TerminateROOT();
   }
}
 
void geom_threejs()
{
 
   TFile::SetCacheFileDir(".");
 
   TGeoManager::Import("https://root.cern/files/cms.root");
 
   gGeoManager->DefaultColors();
   gGeoManager->SetVisLevel(4);
   gGeoManager->GetVolume("TRAK")->InvisibleAll();
   gGeoManager->GetVolume("HVP2")->SetTransparency(20);
   gGeoManager->GetVolume("HVEQ")->SetTransparency(20);
   gGeoManager->GetVolume("YE4")->SetTransparency(10);
   gGeoManager->GetVolume("YE3")->SetTransparency(20);
   gGeoManager->GetVolume("RB2")->SetTransparency(99);
   gGeoManager->GetVolume("RB3")->SetTransparency(99);
   gGeoManager->GetVolume("COCF")->SetTransparency(99);
   gGeoManager->GetVolume("HEC1")->SetLineColor(7);
   gGeoManager->GetVolume("EAP1")->SetLineColor(7);
   gGeoManager->GetVolume("EAP2")->SetLineColor(7);
   gGeoManager->GetVolume("EAP3")->SetLineColor(7);
   gGeoManager->GetVolume("EAP4")->SetLineColor(7);
   gGeoManager->GetVolume("HTC1")->SetLineColor(2);
 
   ROOT::RGeomDescription data;
 
   data.Build(gGeoManager, "CMSE");
 
   std::string json = data.ProduceJson();
 
   base64 = TBase64::Encode(json.c_str());
 
   // create window
   window = ROOT::RWebWindow::Create();
 
   // configure default html page
   // either HTML code can be specified or just name of file after 'file:' prefix
   std::string fdir = __FILE__;
   auto pos = fdir.find("geom_threejs.cxx");
   if (pos > 0)
      fdir.resize(pos);
   else
      fdir = gROOT->GetTutorialsDir() + std::string("/webgui/geom/");
   window->SetDefaultPage("file:" + fdir + "geom_threejs.html");
 
   // this is call-back, invoked when message received from client
   window->SetDataCallBack(ProcessData);
 
   window->SetGeometry(800, 600); // configure predefined geometry
 
   window->Show();
}

Author

Sergey Linev

Definition in file geom_threejs.cxx.