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iSpy WebGL

Open File

Open local file(s)

or drag and drop a file into the display window

Open Event

Files Events

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Settings

Invert colors:

Hide axes:

Show information dialogs:

Show display statistics:

Show experiment logo:

Set maximum frame rate: fps

Set imported geometry transparency:

  • WebGLRenderer
  • CanvasRenderer
  • SVGRenderer

About

iSpy-WebGL

A browser-based event display for the CMS experiment at the LHC using WebGL

Questions/comments/problems

Code and Issues

Contributors: L. Barnard, M. Hategan, C. Logren, T. McCauley, P. Nguyen, M. Saunby

This application uses three.js

Set to Stereo View

This view is specifically designed for use in a Google Cardboard viewer and therefore requires a viewer and a suitable mobile phone.

To use with the viewer, rotate the phone to landscape, press the button below, and insert into the viewer. The view automatically pans forward in the direction of view. To exit, tap the screen.

Export model

  • Export OBJ
  • Export GLTF
  • Export STL

Import 3D Model

Select a 3D model to load.

Currently only .obj format is supported. If an additional .mtl is available and loaded it will be used as well.

Nota bene: a large complicated 3D model may take minutes to load.

Files available via the web have been created from SketchUp models created by T. Sakuma.

Open local file(s):

Open Model

Files

Detector

Tracker:
Silicon and pixel detectors used to detect passage of charged particles
ECAL Barrel:
Central electromagnetic calorimeter; measures energy of electrons and photons
ECAL Endcap:
Electromagnetic calorimeters at either end of CMS for measurements close to the beam axis
HCAL Barrel:
Central hadronic calorimeter; measures energy of hadrons
HCAL Endcap:
Hadronic calorimeters at either end of CMS, close to the beam axis
HCAL Outer:
Hadronic calorimeter layer just outside the solenoid magnet
HCAL Forward:
Hadronic calorimeters farther down and very close to the beam axis
Drift Tubes (DT):
Central muon chambers outside the solenoid and HCAL Outer
Cathode Strip Chambers (CSC):
Forward muon detectors
Resistive Place Chambers (RPC):
Solid state muon detectors

Want to know more? Go here.

Imported

Imported geometry models such the beam pipe.

Provenance

Event:
Each event is distinguished by a run number, event number, luminosity section, and time stamp

Tracking

Tracks (reco.):
Reconstructed particle tracks in the tracker
Rec. Hits (Tracking):
All particle hits in the tracker

ECAL: Electromagnetic calorimeter

Barrel Rec. Hits:
Energy in a single ECAL crystal
Endcap Rec. Hits:
Hits in ECAL Endcap
Preshower Rec. Hits:
Hits in ECAL Preshower

HCAL: Hadronic calorimeter

Barrel Rec. Hits:
Energy in a single HCAL tile
Endcap Rec. Hits:
Hits in HCAL Endcap
Forward Rec. Hits:
Hits in HCAL Forward
Outer Rec. Hits:
Hits in HCAL Outer

Muon

Matching muon chambers:
The muon chambers (drift tubes and/or cathode strip chambers) that correspond to the reconstructed muon
DT Rec. Hits:
Muon hits in Drift Tubes
DT Rec. Segments:
Muon track segments in Drift Tubes
CSC Segments:
Muon track segments in Cathode Strip Chambers
RPC Rec. Hits:
Muon hits in Resistive Plate Chambers
CSC Rec. Hits:
Muon hits in Cathode Strip Chambers

Physics Objects

Electron Tracks (GSF):
Reconstructed candidate electron tracks in the tracker
Photons (Reco):
Inferred photon trajectories
Tracker Muons (Reco):
Reconstructed muon tracks in tracker
Stand-alone Muons (Reco):
Reconstructed muon track segments in muon chambers
Global Muons (Reco):
Reconstructed complete muon tracks, combining tracker and stand-alone muons
Jets:
Collimated streams of particles
MET:
Missing transverse energy

Type Value

Invariant mass

GeV

How to use the event display

The CMS event display (called iSpy) can be used to visualise in your browser collision data recorded by the CMS detector. Files of a custom type called .ig can be opened using iSpy. Each .ig file is in fact a collection containing numerous individual collision events.

This guide will take you through some of the basic functionality of the event display.

Top-row buttons

Each button comes with a tool-tip: hover over the button to know its functionality.

Open .ig files from the server.
and Navigate to previous and next events in the .ig file you loaded.
Returns the event display to its initial orientation. and Zoom in and out.
, and View the collision event along one of three axes.
and Switch between a perspective projection and an orthographic projection.
Use the settings button to invert the colours of the display or display the frame rate.

Sidebar

Click on the checkboxes to show or hide the CMS sub-detectors, particle tracks and hits, and more.

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